前文：https://www.cnblogs.com/Arisf/p/14095002.html

在之前图书管理系统上做了改进优化

图书管理系统v2

首先是项目结构：

1.数据库的连接：

  1.   1 package db;
  2.   2
  3.   3 import java.sql.Connection;
  4.   4 import java.sql.DriverManager;
  5.   5 import java.sql.PreparedStatement;
  6.   6 import java.sql.ResultSet;
  7.   7 import java.sql.SQLException;
  8.   8 import java.sql.Statement;
  9.   9
  10.  10 public class DBUtil {
  11.  11     private static String url = "jdbc:mysql://localhost:3306/book system?&useSSL=false&serverTimezone=UTC";
  12.  12     private static String user = "root";//用户名一般默认是root
  13.  13     private static String password = "";//自己的密码
  14.  14     private static String jdbcName="com.mysql.cj.jdbc.Driver";
  15.  15     private Connection con=null;
  16.  16     public static  Connection getConnection() {
  17.  17         Connection con=null;
  18.  18         try {
  19.  19             Class.forName(jdbcName);
  20.  20             con=DriverManager.getConnection(url, user, password);
  21.  21             //System.out.println("数据库连接成功");
  22.  22         } catch (Exception e) {
  23.  23             // TODO Auto-generated catch block
  24.  24             //System.out.println("数据库连接失败");
  25.  25             e.printStackTrace();
  26.  26         }
  27.  27         try {
  28.  28             con = DriverManager.getConnection(url,user,password);
  29.  29             System.out.println("数据库连接成功");
  30.  30
  31.  31
  32.  32         } catch (SQLException e) {
  33.  33             // TODO: handle exception
  34.  34             e.printStackTrace();
  35.  35         }
  36.  36         return con;
  37.  37     }
  38.  38     public static void main(String[] args)throws SQLException {
  39.  39         Connection conn = getConnection();
  40.  40         PreparedStatement pstmt = null;
  41.  41         ResultSet rs = null;
  42.  42         String sql ="select * from user_information";
  43.  43         pstmt = conn.prepareStatement(sql);
  44.  44         rs = pstmt.executeQuery();
  45.  45         System.out.println(getConnection());
  46.  46         while(rs.next()){
  47.  47             System.out.println("数据表连接成功");
  48.  48         }
  49.  49
  50.  50     }
  51.  51
  52.  52     public static void close(Connection con) {
  53.  53         if(con!=null)
  54.  54             try {
  55.  55                 con.close();
  56.  56             } catch (SQLException e) {
  57.  57                 // TODO Auto-generated catch block
  58.  58                 e.printStackTrace();
  59.  59             }
  60.  60
  61.  61     }
  62.  62     public static void close(Statement state, Connection conn) {
  63.  63         if(state!=null) {
  64.  64             try {
  65.  65                 state.close();
  66.  66             } catch (SQLException e) {
  67.  67                 e.printStackTrace();
  68.  68             }
  69.  69         }
  70.  70         if(conn!=null) {
  71.  71             try {
  72.  72                 conn.close();
  73.  73             } catch (SQLException e) {
  74.  74                 e.printStackTrace();
  75.  75             }
  76.  76         }
  77.  77     }
  78.  78
  79.  79     public static void close(ResultSet rs, Statement state, Connection conn) {
  80.  80         if(rs!=null) {
  81.  81             try {
  82.  82                 rs.close();
  83.  83             } catch (SQLException e) {
  84.  84                 e.printStackTrace();
  85.  85             }
  86.  86         }
  87.  87         if(state!=null) {
  88.  88             try {
  89.  89                 state.close();
  90.  90             } catch (SQLException e) {
  91.  91                 e.printStackTrace();
  92.  92             }
  93.  93         }
  94.  94         if(conn!=null) {
  95.  95             try {
  96.  96                 conn.close();
  97.  97             } catch (SQLException e) {
  98.  98                 e.printStackTrace();
  99.  99             }
  100. 100         }
  101. 101     }
  102. 102
  103. 103 }

2.实体类(3个——图书表，借书表，用户表)

  1.  1 package bean;
  2.  2
  3.  3 public class Bean_book {
  4.  4     private int id;
  5.  5     private String name;
  6.  6     private String writer;
  7.  7     private String press;
  8.  8     private int num;
  9.  9
  10. 10
  11. 11     public int getId() {
  12. 12         return id;
  13. 13     }
  14. 14     public void setId(int id) {
  15. 15         this.id = id;
  16. 16     }
  17. 17
  18. 18     public String getName() {
  19. 19         return name;
  20. 20     }
  21. 21     public void setName(String name) {
  22. 22         this.name = name;
  23. 23     }
  24. 24
  25. 25     public String getWriter() {
  26. 26         return writer;
  27. 27     }
  28. 28     public void setWriter(String writer) {
  29. 29         this.writer = writer;
  30. 30     }
  31. 31
  32. 32     public String getPress() {
  33. 33         return press;
  34. 34     }
  35. 35     public void setPress(String press) {
  36. 36         this.press = press;
  37. 37     }
  38. 38
  39. 39     public int getNum() {
  40. 40         return num;
  41. 41     }
  42. 42     public void setNum(int num) {
  43. 43         this.num = num;
  44. 44     }
  45. 45
  46. 46
  47. 47     public Bean_book(int id, String name, String writer,  String press,int num) {
  48. 48         this.id = id;
  49. 49         this.name = name;
  50. 50         this.writer = writer;
  51. 51         this.press = press;
  52. 52         this.num = num;
  53. 53     }
  54. 54
  55. 55
  56. 56
  57. 57     public String toString() {
  58. 58         return "Book{" +
  59. 59                 "id=" + id +
  60. 60                 ", name='" + name + '\'' +
  61. 61                 ", writer='" + writer + '\'' +
  62. 62                 ", press='" + press + '\'' +
  63. 63                 ", num=" + num +
  64. 64                 '}';
  65. 65     }
  66. 66
  67. 67
  68. 68 }
  1.  1 package bean;
  2.  2
  3.  3
  4.  4 public class Bean_borrowing {
  5.  5     private int id;
  6.  6     private String name;
  7.  7     private String writer;
  8.  8     private String press;
  9.  9     private String date;
  10. 10     private int borrower;
  11. 11
  12. 12
  13. 13
  14. 14
  15. 15     public int getId() {
  16. 16         return id;
  17. 17     }
  18. 18     public void setId(int id) {
  19. 19         this.id = id;
  20. 20     }
  21. 21
  22. 22     public String getName() {
  23. 23         return name;
  24. 24     }
  25. 25     public void setName(String name) {
  26. 26         this.name = name;
  27. 27     }
  28. 28
  29. 29     public String getWriter() {
  30. 30         return writer;
  31. 31     }
  32. 32     public void setWriter(String writer) {
  33. 33         this.writer = writer;
  34. 34     }
  35. 35
  36. 36     public String getPress() {
  37. 37         return press;
  38. 38     }
  39. 39     public void setPress(String press) {
  40. 40         this.press = press;
  41. 41     }
  42. 42
  43. 43     public String getDate() {
  44. 44         return date;
  45. 45     }
  46. 46     public void setDate(String date) {
  47. 47         this.date = date;
  48. 48     }
  49. 49     public int getBorrower() {
  50. 50         return borrower;
  51. 51     }
  52. 52     public void setBorrower(int borrower) {
  53. 53         this.borrower = borrower;
  54. 54     }
  55. 55
  56. 56     public Bean_borrowing(int id, String name, String writer,  String press,String date,int borrower) {
  57. 57         this.id = id;
  58. 58         this.name = name;
  59. 59         this.writer = writer;
  60. 60         this.press = press;
  61. 61         this.date = date;
  62. 62         this.borrower=borrower;
  63. 63     }
  64. 64
  65. 65     public String toString() {
  66. 66         return "Borrowing{" +
  67. 67                 "id=" + id +
  68. 68                 ", name='" + name + '\'' +
  69. 69                 ", writer='" + writer + '\'' +
  70. 70                 ", press='" + press + '\'' +
  71. 71                 ", date='" + date + '\'' +
  72. 72                 ", borrower=" + borrower +
  73. 73                 '}';
  74. 74     }
  75. 75
  76. 76 }
  1.  1 package bean;
  2.  2
  3.  3 public class Bean_user {
  4.  4
  5.  5     private int uid;
  6.  6     private String name;
  7.  7     private String sex;
  8.  8     private String college;
  9.  9     private String password;
  10. 10     private String identity;
  11. 11
  12. 12
  13. 13     public int getUid() {
  14. 14         return uid;
  15. 15     }
  16. 16     public void setUid(int uid) {
  17. 17         this.uid = uid;
  18. 18     }
  19. 19
  20. 20     public String getName() {
  21. 21         return name;
  22. 22     }
  23. 23     public void setName(String name) {
  24. 24         this.name = name;
  25. 25     }
  26. 26
  27. 27     public String getSex() {
  28. 28         return sex;
  29. 29     }
  30. 30     public void setSex(String sex) {
  31. 31         this.sex = sex;
  32. 32     }
  33. 33
  34. 34     public String getCollege() {
  35. 35         return college;
  36. 36     }
  37. 37     public void setCollege(String college) {
  38. 38         this.college = college;
  39. 39     }
  40. 40
  41. 41     public String getPassword() {
  42. 42         return password;
  43. 43     }
  44. 44     public void setPassword(String password) {
  45. 45         this.password = password;
  46. 46     }
  47. 47
  48. 48     public String getIdentity() {
  49. 49         return identity;
  50. 50     }
  51. 51     public void setIdentity(String identity) {
  52. 52         this.identity = identity;
  53. 53     }
  54. 54
  55. 55     public Bean_user(int uid, String name, String sex,  String college,String password,String identity) {
  56. 56         this.uid = uid;
  57. 57         this.name = name;
  58. 58         this.sex = sex;
  59. 59         this.college = college;
  60. 60         this.password = password;
  61. 61         this.identity = identity;
  62. 62     }
  63. 63
  64. 64
  65. 65
  66. 66
  67. 67     public String toString() {
  68. 68         return "User{" +
  69. 69                 "uid=" + uid +
  70. 70                 ", name='" + name + '\'' +
  71. 71                 ", sex='" + sex + '\'' +
  72. 72                 ", college='" + college + '\'' +
  73. 73                 ", password='" + password + '\'' +
  74. 74                 ", identity=" + identity +
  75. 75                 '}';
  76. 76     }
  77. 77
  78. 78 }

3.Dao

  1.   1 package dao;
  2.   2
  3.   3 import java.sql.Connection;
  4.   4 import java.sql.PreparedStatement;
  5.   5 import java.sql.ResultSet;
  6.   6 import java.sql.SQLException;
  7.   7 import java.sql.Statement;
  8.   8 import java.text.SimpleDateFormat;
  9.   9 import java.util.ArrayList;
  10.  10 import java.util.Date;
  11.  11 import java.util.List;
  12.  12
  13.  13 import bean.Bean_user;
  14.  14 import bean.Bean_book;
  15.  15 import bean.Bean_borrowing;
  16.  16 import db.DBUtil;
  17.  17
  18.  18 public class Dao {
  19.  19     //dao层
  20.  20     private DBUtil dbutil=new DBUtil();
  21.  21
  22.  22
  23.  23 public Dao() {
  24.  24     // TODO Auto-generated constructor stub
  25.  25 }
  26.  26 public boolean insert_user(Bean_user bean) {//插入读者数据的方法
  27.  27     boolean f=false;
  28.  28     String sql="insert into user_information(uid,name,sex,college,password,identity) values('"+bean.getUid()+"','"+bean.getName()+"','"+bean.getSex()+"','"+bean.getCollege()+"','"+bean.getPassword()+"','"+bean.getIdentity()+"')";
  29.  29     Connection conn=DBUtil.getConnection();//数据库连接，加载驱动
  30.  30     Statement state=null;
  31.  31     try
  32.  32     {
  33.  33         state=conn.createStatement();//实例化Statement对象,方便对sql语句进行操作
  34.  34         System.out.println(conn);
  35.  35         state.executeUpdate(sql);
  36.  36         f=true;
  37.  37         //执行数据库更新操作用于执行INSERT、UPDATE或DELETE语句以及SQLDDL（数据定义语言）语句，
  38.  38         //例如CREATETABLE和DROPTABLE,（创建表和删除表）
  39.  39     }catch(Exception e)//当try语句中s出现异常时，会执行catch中的语句
  40.  40       {
  41.  41         e.printStackTrace();//捕获异常的语句
  42.  42       }
  43.  43      finally //finally作为异常处理的一部分，它只能用在try/catch语句中，并且附带一个语句块，表示这段语句最终一定会被执行（不管有没有抛出异常），经常被用在需要释放资源的情况下。
  44.  44      {
  45.  45          DBUtil.close(conn);
  46.  46      }
  47.  47     return f;
  48.  48 }
  49.  49
  50.  50 public boolean insert_book(Bean_book bean) {//插入图书数据的方法
  51.  51     boolean f=false;
  52.  52     String sql="insert into book_information(id,name,writer,press,num) values('"+bean.getId()+"','"+bean.getName()+"','"+bean.getWriter()+"','"+bean.getPress()+"','"+bean.getNum()+"')";
  53.  53     Connection conn=DBUtil.getConnection();//数据库连接，加载驱动
  54.  54     Statement state=null;
  55.  55     try
  56.  56     {
  57.  57         state=conn.createStatement();//实例化Statement对象,方便对sql语句进行操作
  58.  58         System.out.println(conn);
  59.  59         state.executeUpdate(sql);
  60.  60         f=true;
  61.  61         //执行数据库更新操作用于执行INSERT、UPDATE或DELETE语句以及SQLDDL（数据定义语言）语句，
  62.  62         //例如CREATETABLE和DROPTABLE,（创建表和删除表）
  63.  63     }catch(Exception e)//当try语句中s出现异常时，会执行catch中的语句
  64.  64       {
  65.  65         e.printStackTrace();//捕获异常的语句
  66.  66       }
  67.  67      finally //finally作为异常处理的一部分，它只能用在try/catch语句中，并且附带一个语句块，表示这段语句最终一定会被执行（不管有没有抛出异常），经常被用在需要释放资源的情况下。
  68.  68      {
  69.  69          DBUtil.close(conn);
  70.  70      }
  71.  71     return f;
  72.  72 }
  73.  73
  74.  74 public boolean insert_borrowing(Bean_borrowing bean) {//插入图书数据的方法
  75.  75     boolean f=false;
  76.  76     String sql="insert into borrowing_information(id,name,writer,press,date,borrower) values('"+bean.getId()+"','"+bean.getName()+"','"+bean.getWriter()+"','"+bean.getPress()+"','"+bean.getDate()+"','"+bean.getBorrower()+"')";
  77.  77     Connection conn=DBUtil.getConnection();//数据库连接，加载驱动
  78.  78     Statement state=null;
  79.  79     try
  80.  80     {
  81.  81         state=conn.createStatement();//实例化Statement对象,方便对sql语句进行操作
  82.  82         System.out.println(conn);
  83.  83         state.executeUpdate(sql);
  84.  84         f=true;
  85.  85         //执行数据库更新操作用于执行INSERT、UPDATE或DELETE语句以及SQLDDL（数据定义语言）语句，
  86.  86         //例如CREATETABLE和DROPTABLE,（创建表和删除表）
  87.  87     }catch(Exception e)//当try语句中s出现异常时，会执行catch中的语句
  88.  88       {
  89.  89         e.printStackTrace();//捕获异常的语句
  90.  90       }
  91.  91      finally //finally作为异常处理的一部分，它只能用在try/catch语句中，并且附带一个语句块，表示这段语句最终一定会被执行（不管有没有抛出异常），经常被用在需要释放资源的情况下。
  92.  92      {
  93.  93          DBUtil.close(conn);
  94.  94      }
  95.  95     return f;
  96.  96 }
  97.  97
  98.  98
  99.  99
  100. 100 public List<Bean_book> list(){//查询所有方法
  101. 101     String sql="select * from book_information order by id ASC";
  102. 102     Connection conn=DBUtil.getConnection();
  103. 103     Statement st=null;
  104. 104     List<Bean_book> list=new ArrayList<>();
  105. 105     ResultSet rs=null;
  106. 106     Bean_book bean=null;
  107. 107     try {
  108. 108         st=conn.createStatement();
  109. 109         st.executeQuery(sql);
  110. 110         rs=st.executeQuery(sql);
  111. 111         while(rs.next()) {
  112. 112             int id=rs.getInt("id");
  113. 113             String name = rs.getString("name");
  114. 114             String writer = rs.getString("writer");
  115. 115             String press = rs.getString("press");
  116. 116             int num=rs.getInt("num");
  117. 117             bean=new Bean_book(id,name,writer,press,num);
  118. 118             list.add(bean);
  119. 119         }
  120. 120     } catch (SQLException e) {
  121. 121         // TODO Auto-generated catch block
  122. 122         e.printStackTrace();
  123. 123     }
  124. 124     finally {
  125. 125         DBUtil.close(rs, st, conn);
  126. 126     }
  127. 127     return list;
  128. 128 }
  129. 129
  130. 130 public List<Bean_borrowing> borrower(int uid){//查询所有方法
  131. 131     String sql="select * from borrowing_information where borrower='"+uid+"' order by date ASC";
  132. 132     Connection conn=DBUtil.getConnection();
  133. 133     Statement st=null;
  134. 134     List<Bean_borrowing> borrower=new ArrayList<>();
  135. 135     ResultSet rs=null;
  136. 136     Bean_borrowing bean=null;
  137. 137     try {
  138. 138         st=conn.createStatement();
  139. 139         st.executeQuery(sql);
  140. 140         rs=st.executeQuery(sql);
  141. 141         while(rs.next()) {
  142. 142             int id=rs.getInt("id");
  143. 143             String name = rs.getString("name");
  144. 144             String writer = rs.getString("writer");
  145. 145             String press = rs.getString("press");
  146. 146             String date = rs.getString("date");
  147. 147             bean=new Bean_borrowing(id,name,writer,press,date,uid);
  148. 148             borrower.add(bean);
  149. 149         }
  150. 150     } catch (SQLException e) {
  151. 151         // TODO Auto-generated catch block
  152. 152         e.printStackTrace();
  153. 153     }
  154. 154     finally {
  155. 155         DBUtil.close(rs, st, conn);
  156. 156     }
  157. 157     return borrower;
  158. 158 }
  159. 159
  160. 160 public List<Bean_borrowing> list_overtime(){//查询过期书
  161. 161
  162. 162     Date date=new Date();
  163. 163     SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
  164. 164     String now=sdf.format(date);
  165. 165
  166. 166     String sql="select * from borrowing_information where date < '"+now+"' order by date ASC";
  167. 167     Connection conn=DBUtil.getConnection();
  168. 168     Statement st=null;
  169. 169     List<Bean_borrowing> list_overtime=new ArrayList<>();
  170. 170     ResultSet rs=null;
  171. 171     Bean_borrowing bean=null;
  172. 172     try {
  173. 173         st=conn.createStatement();
  174. 174         st.executeQuery(sql);
  175. 175         rs=st.executeQuery(sql);
  176. 176         while(rs.next()) {
  177. 177             int id=rs.getInt("id");
  178. 178             int borrower=rs.getInt("borrower");
  179. 179             String name = rs.getString("name");
  180. 180             String writer = rs.getString("writer");
  181. 181             String press = rs.getString("press");
  182. 182             String date1 = rs.getString("date");
  183. 183             bean=new Bean_borrowing(id,name,writer,press,date1,borrower);
  184. 184             list_overtime.add(bean);
  185. 185         }
  186. 186     } catch (SQLException e) {
  187. 187         // TODO Auto-generated catch block
  188. 188         e.printStackTrace();
  189. 189     }
  190. 190     finally {
  191. 191         DBUtil.close(rs, st, conn);
  192. 192     }
  193. 193     return list_overtime;
  194. 194 }
  195. 195
  196. 196
  197. 197 public List<Bean_book> searchByName(String str) throws SQLException{//查询条件方法
  198. 198     String sql="select * from book_information where(name like '%"+str+"%')";
  199. 199     Connection conn=DBUtil.getConnection();
  200. 200     Statement st=null;
  201. 201     PreparedStatement pt = conn.prepareStatement(sql);
  202. 202     List<Bean_book> search=new ArrayList<>();
  203. 203     ResultSet rs=null;
  204. 204     Bean_book bean=null;
  205. 205     try {
  206. 206       pt=conn.prepareStatement(sql);
  207. 207         rs=pt.executeQuery();
  208. 208         while(rs.next()) {
  209. 209             int id=rs.getInt("id");
  210. 210             String name = rs.getString("name");
  211. 211             String writer = rs.getString("writer");
  212. 212             String press = rs.getString("press");
  213. 213             int num=rs.getInt("num");
  214. 214             bean=new Bean_book(id,name,writer,press,num);
  215. 215             search.add(bean);
  216. 216         }
  217. 217     } catch (SQLException e) {
  218. 218         // TODO Auto-generated catch block
  219. 219         e.printStackTrace();
  220. 220     }
  221. 221     finally {
  222. 222         DBUtil.close(rs, st, conn);
  223. 223     }
  224. 224     return search;
  225. 225 }
  226. 226
  227. 227 public List<Bean_book> searchByWriter(String str) throws SQLException{//查询条件方法
  228. 228     String sql="select * from book_information where(writer like '%"+str+"%')";
  229. 229     Connection conn=DBUtil.getConnection();
  230. 230     Statement st=null;
  231. 231     PreparedStatement pt = conn.prepareStatement(sql);
  232. 232     List<Bean_book> search=new ArrayList<>();
  233. 233     ResultSet rs=null;
  234. 234     Bean_book bean=null;
  235. 235     try {
  236. 236       pt=conn.prepareStatement(sql);
  237. 237         rs=pt.executeQuery();
  238. 238         while(rs.next()) {
  239. 239             int id=rs.getInt("id");
  240. 240             String name = rs.getString("name");
  241. 241             String writer = rs.getString("writer");
  242. 242             String press=rs.getString("press");
  243. 243             int num=rs.getInt("num");
  244. 244             bean=new Bean_book(id,name,writer,press,num);
  245. 245             search.add(bean);
  246. 246         }
  247. 247     } catch (SQLException e) {
  248. 248         // TODO Auto-generated catch block
  249. 249         e.printStackTrace();
  250. 250     }
  251. 251     finally {
  252. 252         DBUtil.close(rs, st, conn);
  253. 253     }
  254. 254     return search;
  255. 255 }
  256. 256
  257. 257 public boolean update(Bean_book bean) {//更新自减方法
  258. 258     String sql="update book_information set num='"+bean.getNum()+"',name='"+bean.getName()+"',writer='"+bean.getWriter()+"',press='"+bean.getPress()+"'where id='"+bean.getId()+"'";
  259. 259     Connection conn=DBUtil.getConnection();
  260. 260     boolean f=false;
  261. 261     Statement st=null;
  262. 262     try {
  263. 263         st=conn.createStatement();
  264. 264         st.executeUpdate(sql);
  265. 265         f=true;
  266. 266     } catch (SQLException e) {
  267. 267         // TODO Auto-generated catch block
  268. 268         e.printStackTrace();
  269. 269     }
  270. 270     return f;
  271. 271 }
  272. 272
  273. 273 public boolean delete_book(int id ) {//删除方法
  274. 274     String sql="delete from book_information where id='"+id+"'";
  275. 275     boolean f=false;
  276. 276     Connection conn =DBUtil.getConnection();
  277. 277     Statement st=null;
  278. 278     try {
  279. 279         st=conn.createStatement();
  280. 280         st.executeUpdate(sql);
  281. 281         f=true;
  282. 282     } catch (SQLException e) {
  283. 283         // TODO Auto-generated catch block
  284. 284         e.printStackTrace();
  285. 285     }
  286. 286     finally{
  287. 287         DBUtil.close(st, conn);
  288. 288     }
  289. 289     return f;
  290. 290 }
  291. 291
  292. 292 public boolean return_book(int id,int uid ) {//删除方法
  293. 293     String sql="delete from borrowing_information where id='"+id+"' and borrower='"+uid+"'";
  294. 294     boolean f=false;
  295. 295     Connection conn =DBUtil.getConnection();
  296. 296     Statement st=null;
  297. 297     try {
  298. 298         st=conn.createStatement();
  299. 299         st.executeUpdate(sql);
  300. 300         f=true;
  301. 301     } catch (SQLException e) {
  302. 302         // TODO Auto-generated catch block
  303. 303         e.printStackTrace();
  304. 304     }
  305. 305     finally{
  306. 306         DBUtil.close(st, conn);
  307. 307     }
  308. 308     return f;
  309. 309 }
  310. 310
  311. 311 }

4.Servlet

  1.  1 package servlet;
  2.  2
  3.  3
  4.  4 import java.io.IOException;
  5.  5 import java.sql.Connection;
  6.  6
  7.  7 import java.sql.DriverManager;
  8.  8 import java.sql.PreparedStatement;
  9.  9 import java.sql.ResultSet;
  10. 10 import java.text.SimpleDateFormat;
  11. 11 import java.util.Date;
  12. 12
  13. 13 import javax.servlet.ServletException;
  14. 14 import javax.servlet.annotation.WebServlet;
  15. 15 import javax.servlet.http.HttpServlet;
  16. 16 import javax.servlet.http.HttpServletRequest;
  17. 17 import javax.servlet.http.HttpServletResponse;
  18. 18
  19. 19
  20. 20
  21. 21 /**
  22. 22  * Servlet implementation class UserServlet
  23. 23  */
  24. 24 @WebServlet("/LoginServlet")
  25. 25 public class LoginServlet extends HttpServlet {
  26. 26     private static final long serialVersionUID = 1L;
  27. 27
  28. 28     /**
  29. 29      * @see HttpServlet#HttpServlet()
  30. 30      */
  31. 31     public LoginServlet() {
  32. 32         super();
  33. 33         // TODO Auto-generated constructor stub
  34. 34     }
  35. 35
  36. 36     /**
  37. 37      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
  38. 38      */
  39. 39     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  40. 40         // TODO Auto-generated method stub
  41. 41         response.getWriter().append("Served at: ").append(request.getContextPath());
  42. 42     }
  43. 43
  44. 44     /**
  45. 45      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  46. 46      */
  47. 47     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  48. 48         // TODO Auto-generated method stub
  49. 49         request.setCharacterEncoding("UTF-8");
  50. 50         response.setCharacterEncoding("UTF-8");
  51. 51         int uid=Integer.parseInt(request.getParameter("uid"));
  52. 52         String pass=String.valueOf(request.getParameter("password"));
  53. 53         String identity=String.valueOf(request.getParameter("identity"));
  54. 54         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  55. 55         String date=sdf.format(new Date());
  56. 56         try {
  57. 57             Class.forName("com.mysql.cj.jdbc.Driver");
  58. 58             String url="jdbc:mysql://localhost:3306/book system?&useSSL=false&serverTimezone=UTC";
  59. 59             String username="root";
  60. 60             String password="whyjlbcdy2001";
  61. 61             Connection conn=DriverManager.getConnection(url,username,password);
  62. 62
  63. 63             String sql="select * from user_information where uid='"+uid+"'and password='"+pass+"'and identity='"+identity+"'";
  64. 64
  65. 65             PreparedStatement ps=conn.prepareStatement(sql);
  66. 66             ResultSet rs=ps.executeQuery();
  67. 67             if(rs.next()) {
  68. 68                 System.out.println(date+"  "+uid+" "+"login"+""+identity);
  69. 69                 System.out.println();
  70. 70                 request.setAttribute("uid", uid);
  71. 71                 if(identity.equals("读者")){
  72. 72                     request.getRequestDispatcher("user_index.jsp").forward(request,response);
  73. 73                 }
  74. 74                 if(identity.equals("管理员")){
  75. 75                     request.getRequestDispatcher("admin_index.jsp").forward(request,response);
  76. 76                 }
  77. 77             }else{
  78. 78                 request.setAttribute("message", "用户名或密码错误");
  79. 79                 request.getRequestDispatcher("login.jsp").forward(request,response);
  80. 80             }
  81. 81         }catch(Exception e) {
  82. 82             e.printStackTrace();
  83. 83         }finally{
  84. 84
  85. 85         }
  86. 86     }
  87. 87
  88. 88 }
  1.  1 package servlet;
  2.  2
  3.  3 import java.io.IOException;
  4.  4 import java.sql.SQLException;
  5.  5 import java.util.List;
  6.  6
  7.  7 import javax.servlet.ServletException;
  8.  8 import javax.servlet.annotation.WebServlet;
  9.  9 import javax.servlet.http.HttpServlet;
  10. 10 import javax.servlet.http.HttpServletRequest;
  11. 11 import javax.servlet.http.HttpServletResponse;
  12. 12
  13. 13 import bean.Bean_book;
  14. 14 import dao.Dao;
  15. 15
  16. 16 /**
  17. 17  * Servlet implementation class searchServlet_admin
  18. 18  */
  19. 19 @WebServlet("/searchServlet_admin")
  20. 20 public class SearchServlet_admin extends HttpServlet {
  21. 21     private static final long serialVersionUID = 1L;
  22. 22
  23. 23     /**
  24. 24      * @see HttpServlet#HttpServlet()
  25. 25      */
  26. 26     public SearchServlet_admin() {
  27. 27         super();
  28. 28         // TODO Auto-generated constructor stub
  29. 29     }
  30. 30
  31. 31     /**
  32. 32      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
  33. 33      */
  34. 34     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  35. 35         //response.getWriter().append("Served at: ").append(request.getContextPath());
  36. 36         request.setCharacterEncoding("utf-8");
  37. 37         response.setCharacterEncoding("utf-8");
  38. 38         String cxfs=request.getParameter("cxfs");
  39. 39         System.out.print(cxfs);
  40. 40         String str=request.getParameter("value");
  41. 41         Dao dao=new Dao();
  42. 42         List<Bean_book> list = null;
  43. 43         try {
  44. 44             if("1".equals(cxfs)){
  45. 45                  list=dao.searchByName(str);
  46. 46              }
  47. 47             if("2".equals(cxfs)){
  48. 48                  list=dao.searchByWriter(str);
  49. 49              }
  50. 50             }catch (SQLException e) {
  51. 51              // TODO 自动生成的 catch 块
  52. 52                 e.printStackTrace();
  53. 53              }
  54. 54         request.setAttribute("list", list);
  55. 55         request.getRequestDispatcher("delete book.jsp").forward(request,response);
  56. 56         System.out.print(list.size());
  57. 57     }
  58. 58
  59. 59     /**
  60. 60      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  61. 61      */
  62. 62     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  63. 63         // TODO Auto-generated method stub
  64. 64         doGet(request, response);
  65. 65     }
  66. 66
  67. 67 }
  1.  1 package servlet;
  2.  2
  3.  3 import java.io.IOException;
  4.  4 import java.sql.SQLException;
  5.  5 import java.util.List;
  6.  6
  7.  7 import javax.servlet.ServletException;
  8.  8 import javax.servlet.annotation.WebServlet;
  9.  9 import javax.servlet.http.HttpServlet;
  10. 10 import javax.servlet.http.HttpServletRequest;
  11. 11 import javax.servlet.http.HttpServletResponse;
  12. 12
  13. 13 import bean.Bean_book;
  14. 14 import dao.Dao;
  15. 15
  16. 16 /**
  17. 17  * Servlet implementation class searchServlet
  18. 18  */
  19. 19 @WebServlet("/SearchServlet")
  20. 20 public class SearchServlet extends HttpServlet {
  21. 21     private static final long serialVersionUID = 1L;
  22. 22
  23. 23     /**
  24. 24      * @see HttpServlet#HttpServlet()
  25. 25      */
  26. 26     public SearchServlet() {
  27. 27         super();
  28. 28         // TODO Auto-generated constructor stub
  29. 29     }
  30. 30
  31. 31     /**
  32. 32      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
  33. 33      */
  34. 34     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  35. 35         // TODO Auto-generated method stub
  36. 36         //response.getWriter().append("Served at: ").append(request.getContextPath());
  37. 37         request.setCharacterEncoding("utf-8");
  38. 38         response.setCharacterEncoding("utf-8");
  39. 39         String cxfs=request.getParameter("cxfs");
  40. 40         System.out.print(cxfs);
  41. 41
  42. 42         String str=request.getParameter("value");
  43. 43          Dao dao=new Dao();
  44. 44          List<Bean_book> list = null;
  45. 45
  46. 46          try {
  47. 47              if("1".equals(cxfs)){
  48. 48                      list=dao.searchByName(str);
  49. 49                  }
  50. 50              if("2".equals(cxfs)){
  51. 51                      list=dao.searchByWriter(str);
  52. 52                  }
  53. 53              } catch (SQLException e) {
  54. 54                  // TODO 自动生成的 catch 块
  55. 55                  e.printStackTrace();
  56. 56              }
  57. 57          request.setAttribute("list", list);
  58. 58          request.getRequestDispatcher("list book.jsp").forward(request,response);
  59. 59          System.out.print(list.size());
  60. 60     }
  61. 61
  62. 62     /**
  63. 63      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  64. 64      */
  65. 65     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  66. 66         // TODO Auto-generated method stub
  67. 67         doGet(request, response);
  68. 68     }
  69. 69
  70. 70 }
  1.   1 package servlet;
  2.   2
  3.   3 import java.io.IOException;
  4.   4 import java.io.UnsupportedEncodingException;
  5.   5 import java.util.List;
  6.   6
  7.   7 import javax.servlet.ServletException;
  8.   8 import javax.servlet.annotation.WebServlet;
  9.   9 import javax.servlet.http.HttpServlet;
  10.  10 import javax.servlet.http.HttpServletRequest;
  11.  11 import javax.servlet.http.HttpServletResponse;
  12.  12
  13.  13
  14.  14
  15.  15 import java.util.Calendar;
  16.  16 import java.util.Date;
  17.  17 import java.text.ParseException;
  18.  18 import java.text.SimpleDateFormat;
  19.  19
  20.  20 import bean.Bean_user;
  21.  21 import bean.Bean_book;
  22.  22 import bean.Bean_borrowing;
  23.  23 import dao.Dao;
  24.  24
  25.  25 /**
  26.  26  * Servlet implementation class servlet
  27.  27  */
  28.  28 @WebServlet("/Servlet")
  29.  29 public class Servlet extends HttpServlet {
  30.  30     Dao dao = new Dao();
  31.  31     private static final long serialVersionUID = 1L;
  32.  32
  33.  33     /**
  34.  34      * @see HttpServlet#HttpServlet()
  35.  35      */
  36.  36     public Servlet() {
  37.  37         super();
  38.  38         // TODO Auto-generated constructor stub
  39.  39     }
  40.  40
  41.  41     private void insert_user(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {//增
  42.  42         // TODO Auto-generated method stub
  43.  43         request.setCharacterEncoding("utf-8");
  44.  44         int uid = Integer.parseInt(request.getParameter("uid"));
  45.  45         String name = request.getParameter("name");
  46.  46         String sex = request.getParameter("sex");
  47.  47         String college= request.getParameter("college");
  48.  48         String password= request.getParameter("password");
  49.  49         String identity= request.getParameter("identity");
  50.  50         Bean_user bean=new Bean_user(uid,name,sex,college,password,identity);
  51.  51
  52.  52         if(dao.insert_user(bean)) {
  53.  53             request.setAttribute("message", "添加成功");
  54.  54             request.getRequestDispatcher("add user.jsp").forward(request, response);
  55.  55         }
  56.  56     }
  57.  57
  58.  58     private void insert_book(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {//增
  59.  59         // TODO Auto-generated method stub
  60.  60         request.setCharacterEncoding("utf-8");
  61.  61
  62.  62         int id = Integer.parseInt(request.getParameter("id"));
  63.  63         String name = request.getParameter("name");
  64.  64         String writer = request.getParameter("writer");
  65.  65         String press= request.getParameter("press");
  66.  66         int num = Integer.parseInt(request.getParameter("num"));
  67.  67         Bean_book bean=new Bean_book(id,name,writer,press,num);
  68.  68
  69.  69         if(dao.insert_book(bean)) {
  70.  70             request.setAttribute("message", "添加成功");
  71.  71             request.getRequestDispatcher("add book.jsp").forward(request, response);
  72.  72         }
  73.  73     }
  74.  74
  75.  75     private void list(HttpServletRequest request, HttpServletResponse response) throws Exception {
  76.  76         // TODO Auto-generated method stub
  77.  77         request.setCharacterEncoding("UTF-8");
  78.  78         String uid = request.getParameter("uid");
  79.  79         //int uid = Integer.parseInt(request.getParameter("id"));
  80.  80         List<Bean_book> list = dao.list();
  81.  81         request.setAttribute("list", list);
  82.  82         request.setAttribute("uid", uid);
  83.  83
  84.  84         request.getRequestDispatcher("list book.jsp").forward(request,response);
  85.  85     }
  86.  86
  87.  87     private void Mylist(HttpServletRequest request, HttpServletResponse response) throws Exception {
  88.  88         // TODO Auto-generated method stub
  89.  89         request.setCharacterEncoding("UTF-8");
  90.  90         String uid_string = request.getParameter("uid");
  91.  91         int uid  = Integer.parseInt(uid_string);
  92.  92         //int uid = Integer.parseInt(request.getParameter("id"));
  93.  93         List<Bean_borrowing> borrower = dao.borrower(uid);
  94.  94         request.setAttribute("list", borrower);
  95.  95         request.setAttribute("uid", uid);
  96.  96
  97.  97         request.getRequestDispatcher("my_list.jsp").forward(request,response);
  98.  98     }
  99.  99
  100. 100     private void list_admin(HttpServletRequest request, HttpServletResponse response) throws Exception {
  101. 101         // TODO Auto-generated method stub
  102. 102         request.setCharacterEncoding("utf-8");
  103. 103         List<Bean_book> list_admin = dao.list();
  104. 104         request.setAttribute("list", list_admin);
  105. 105         request.getRequestDispatcher("delete book.jsp").forward(request,response);
  106. 106     }
  107. 107
  108. 108     private void list_overtime(HttpServletRequest request, HttpServletResponse response) throws Exception {
  109. 109         // TODO Auto-generated method stub
  110. 110         request.setCharacterEncoding("UTF-8");
  111. 111
  112. 112         String uid_string = request.getParameter("uid");
  113. 113         int uid  = Integer.parseInt(uid_string);
  114. 114         //int uid = Integer.parseInt(request.getParameter("id"));
  115. 115         List<Bean_borrowing> list_overtime = dao.list_overtime();
  116. 116
  117. 117         request.setAttribute("list", list_overtime);
  118. 118         request.setAttribute("uid", uid);
  119. 119
  120. 120         request.getRequestDispatcher("list_overtime.jsp").forward(request,response);
  121. 121     }
  122. 122
  123. 123
  124. 124
  125. 125     @SuppressWarnings("deprecation")
  126. 126     private void borrow(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//改
  127. 127         // TODO Auto-generated method stub
  128. 128         request.setCharacterEncoding("utf-8");
  129. 129         Date date0=new Date();
  130. 130         date0.setMonth(date0.getMonth()+3);
  131. 131         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
  132. 132         String date=sdf.format(date0);
  133. 133         int id = Integer.parseInt(request.getParameter("id"));
  134. 134         String name = request.getParameter("name");
  135. 135         String writer = request.getParameter("writer");
  136. 136         String press = request.getParameter("press");
  137. 137
  138. 138         int num= Integer.parseInt(request.getParameter("num"));
  139. 139         num=num-1;
  140. 140
  141. 141         String uid_string = request.getParameter("uid");
  142. 142         int uid  = Integer.parseInt(uid_string);
  143. 143
  144. 144
  145. 145         Bean_book bean1=new Bean_book(id,name,writer,press,num);
  146. 146         Bean_borrowing bean2=new Bean_borrowing(id,name,writer,press,date,uid);
  147. 147
  148. 148         dao.update(bean1);
  149. 149         dao.insert_borrowing(bean2);
  150. 150         request.setAttribute("uid", uid);
  151. 151         request.getRequestDispatcher("Servlet?method=list").forward(request, response);
  152. 152     }
  153. 153
  154. 154     private void delete_book(HttpServletRequest request, HttpServletResponse response) throws Exception, IOException {//删
  155. 155         // TODO Auto-generated method stub
  156. 156         request.setCharacterEncoding("UTF-8");
  157. 157         int id=Integer.parseInt(request.getParameter("id"));
  158. 158         dao.delete_book(id); //进行数据库的删除操作
  159. 159         request.setAttribute("message", "删除成功");
  160. 160         request.getRequestDispatcher("Servlet?method=list_admin").forward(request, response);
  161. 161     }
  162. 162
  163. 163     private void return_book(HttpServletRequest request, HttpServletResponse response) throws Exception, IOException {//删
  164. 164         // TODO Auto-generated method stub
  165. 165         request.setCharacterEncoding("UTF-8");
  166. 166         String uid_string = request.getParameter("uid");
  167. 167         int uid  = Integer.parseInt(uid_string);
  168. 168         int id=Integer.parseInt(request.getParameter("id"));
  169. 169         dao.return_book(id,uid); //进行数据库的删除操作
  170. 170         request.setAttribute("message", "归还成功");
  171. 171         request.setAttribute("uid", uid);
  172. 172         request.getRequestDispatcher("Servlet?method=Mylist").forward(request, response);
  173. 173     }
  174. 174
  175. 175     /**
  176. 176      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
  177. 177      */
  178. 178     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  179. 179         // TODO Auto-generated method stub
  180. 180         request.setCharacterEncoding("utf-8");
  181. 181         String method=request.getParameter("method");
  182. 182          if("insert_user".equals(method)) {
  183. 183              insert_user(request,response);
  184. 184             }
  185. 185          else if("insert_book".equals(method)) {
  186. 186              insert_book(request,response);
  187. 187          }
  188. 188          else if("list".equals(method)) {
  189. 189                 try {
  190. 190                     list(request,response);
  191. 191                 } catch (Exception e) {
  192. 192                     // TODO Auto-generated catch block
  193. 193                     e.printStackTrace();
  194. 194                 }
  195. 195          }
  196. 196          else if("list_overtime".equals(method)) {
  197. 197                 try {
  198. 198                     list_overtime(request,response);
  199. 199                 } catch (Exception e) {
  200. 200                     // TODO Auto-generated catch block
  201. 201                     e.printStackTrace();
  202. 202                 }
  203. 203          }
  204. 204          else if("list_admin".equals(method)) {
  205. 205                 try {
  206. 206                     list_admin(request,response);
  207. 207                 } catch (Exception e) {
  208. 208                     // TODO Auto-generated catch block
  209. 209                     e.printStackTrace();
  210. 210                 }
  211. 211          }
  212. 212          else if("Mylist".equals(method)) {
  213. 213                 try {
  214. 214                     Mylist(request,response);
  215. 215                 } catch (Exception e) {
  216. 216                     // TODO Auto-generated catch block
  217. 217                     e.printStackTrace();
  218. 218                 }
  219. 219          }
  220. 220          else if("borrow".equals(method)) {
  221. 221                 borrow(request,response);
  222. 222             }
  223. 223          else if("delete_book".equals(method)) {
  224. 224                 try {
  225. 225                     delete_book(request,response);
  226. 226                 } catch (Exception e) {
  227. 227                     // TODO Auto-generated catch block
  228. 228                     e.printStackTrace();
  229. 229                 }
  230. 230             }
  231. 231          else if("return_book".equals(method)) {
  232. 232                 try {
  233. 233                     return_book(request,response);
  234. 234                 } catch (Exception e) {
  235. 235                     // TODO Auto-generated catch block
  236. 236                     e.printStackTrace();
  237. 237                 }
  238. 238             }
  239. 239     }
  240. 240
  241. 241     /**
  242. 242      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
  243. 243      */
  244. 244     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  245. 245         // TODO Auto-generated method stub
  246. 246         doGet(request, response);
  247. 247     }
  248. 248
  249. 249 }

5.前端页面

  1.  1     <%@ page language="java" contentType="text/html; charset=UTF-8"
  2.  2     pageEncoding="UTF-8"%>
  3.  3 <!DOCTYPE html>
  4.  4 <html>
  5.  5 <head>
  6.  6 <meta charset="UTF-8">
  7.  7 <title>登录</title>
  8.  8 </head>
  9.  9 <body>
  10. 10 <%
  11. 11         Object message = request.getAttribute("message");
  12. 12         if (message != null && !"".equals(message)) {
  13. 13     %>
  14. 14     <script type="text/javascript">
  15. 15               alert("<%=request.getAttribute("message")%>"); //弹出对话框
  16. 16     </script>
  17. 17     <%
  18. 18         }
  19. 19     %>
  20. 20 <form name="user" action="LoginServlet" method="post" onsubmit="return check()">
  21. 21       <table id="addTable" class="table table-bordered" align="center">
  22. 22
  23. 23        <tr class="text-center row">
  24. 24                 <td class="col-sm-2">
  25. 25                     学号/工号
  26. 26                 </td>
  27. 27                 <td class="col-sm-4">
  28. 28                        <input type="number" class="form-control"  name="uid" id="uid" >
  29. 29                 </td>
  30. 30        </tr>
  31. 31
  32. 32        <tr class="text-center row">
  33. 33                 <td class="col-sm-2">
  34. 34                       密码
  35. 35                 </td>
  36. 36                 <td class="col-sm-4">
  37. 37                   <input type="password" class="form-control"  name="password" id="password">
  38. 38                 </td>
  39. 39        </tr>
  40. 40
  41. 41
  42. 42        <tr class="text-center row">
  43. 43                 <td>
  44. 44                   登陆身份
  45. 45                 </td>
  46. 46                 <td colspan="3">
  47. 47                   <select class="form-control" id="identity" name="identity">
  48. 48                     <option value="读者">读者</option>
  49. 49                     <option value="管理员">管理员</option>
  50. 50                   </select>
  51. 51                 </td>
  52. 52        </tr>
  53. 53
  54. 54
  55. 55         <tr class="text-center row" align="center">
  56. 56                 <td colspan="3">
  57. 57                     <input type="submit" value="登录" >
  58. 58                 </td>
  59. 59        </tr>
  60. 60        </table>
  61. 61
  62. 62 </form>
  63. 63 <script type="text/javascript">
  64. 64         function check(){
  65. 65             if(user.uid.value==""||user.uid.value==null){
  66. 66                 alert("学号/工号为空!");
  67. 67                 return false;
  68. 68             }
  69. 69             if(user.password.value==""||user.password.value==null){
  70. 70                 alert("密码为空！");
  71. 71                 return false;
  72. 72             }
  73. 73         }
  74. 74     </script>
  75. 75 </body>
  76. 76 </html>

登陆页面

  1.  1 <%@ page language="java" contentType="text/html; charset=UTF-8"
  2.  2     pageEncoding="UTF-8"%>
  3.  3                <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
  4.  4 <!DOCTYPE html>
  5.  5 <html>
  6.  6 <head>
  7.  7 <meta charset="UTF-8">
  8.  8 <title>读者功能页</title>
  9.  9 </head>
  10. 10 <body>
  11. 11 <%
  12. 12         Object uid = request.getAttribute("uid");
  13. 13         if (uid != null && !"".equals(uid)) {
  14. 14     %>
  15. 15     <script type="text/javascript">
  16. 16               alert("欢迎您！读者"+<%=request.getAttribute("uid")%>); //弹出对话框
  17. 17     </script>
  18. 18     <%
  19. 19         }
  20. 20     %>
  21. 21 当前用户：<%=uid %>
  22. 22     <div align="center" font-size="30px">
  23. 23         <h1>读者</h1>
  24. 24         <div>
  25. 25             <a  href="Servlet?method=list&uid=<%=uid%>">浏览图书信息</a>
  26. 26         </div>
  27. 27         <div>
  28. 28             <a href="Servlet?method=list&uid=<%=uid%>">查询图书信息</a>
  29. 29         </div>
  30. 30         <div>
  31. 31             <a href="Servlet?method=list&uid=<%=uid%>">借阅图书</a>
  32. 32         </div>
  33. 33         <div>
  34. 34             <a href="Servlet?method=Mylist&uid=<%=uid%>">浏览催还书目</a>
  35. 35         </div>
  36. 36         <div>
  37. 37             <a href="Servlet?method=Mylist&uid=<%=uid%>">归还图书</a>
  38. 38         </div>
  39. 39     </div>
  40. 40 </body>
  41. 41 </html>

读者主页

  1.  1 <%@ page language="java" contentType="text/html; charset=UTF-8"
  2.  2     pageEncoding="UTF-8"%>
  3.  3 <!DOCTYPE html>
  4.  4 <html>
  5.  5 <head>
  6.  6 <meta charset="UTF-8">
  7.  7 <title>管理员主页</title>
  8.  8 </head>
  9.  9 <body>
  10. 10 <%
  11. 11         Object uid = request.getAttribute("uid");
  12. 12         if (uid != null && !"".equals(uid)) {
  13. 13     %>
  14. 14     <script type="text/javascript">
  15. 15               alert("工号"+<%=request.getAttribute("uid")%>+'你好！'); //弹出对话框
  16. 16     </script>
  17. 17     <%
  18. 18         }
  19. 19     %>
  20. 20 当前用户：<%=uid %>
  21. 21    <div align="center" font-size="30px">
  22. 22         <h1>管理员</h1>
  23. 23         <div>
  24. 24             <a  href="add user.jsp">添加用户信息</a>
  25. 25         </div>
  26. 26         <div>
  27. 27             <a href="add book.jsp">添加新书信息</a>
  28. 28         </div>
  29. 29         <div>
  30. 30             <a href="Servlet?method=list_admin">删除书目信息</a>
  31. 31         </div>
  32. 32         <div>
  33. 33             <a href="Servlet?method=list_overtime&uid=<%=uid%>">打印催还书目</a>
  34. 34         </div>
  35. 35     </div>
  36. 36 </body>
  37. 37 </html>

管理员主页

  1.  1 <%@ page language="java" contentType="text/html; charset=UTF-8"
  2.  2     pageEncoding="UTF-8"%>
  3.  3            <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
  4.  4 <!DOCTYPE html>
  5.  5 <html>
  6.  6 <head>
  7.  7 <meta charset="UTF-8">
  8.  8 <title>查询</title>
  9.  9 </head>
  10. 10 <body>
  11. 11 <%
  12. 12         Object uid = request.getAttribute("uid");
  13. 13     %>
  14. 14 当前用户：<%=uid%>
  15. 15     <div align="center">
  16. 16         <h1 >信息列表</h1>
  17. 17         <h3>当前时间：<input  id="sysDate" style="font-size:18.72px;color:red;width: 320px;text-align: center;"></h3>
  18. 18           <h1>
  19. 19         <form action="SearchServlet" method="post">
  20. 20         <select name="cxfs">
  21. 21   <option  id="cxfs"value ="1">书名</option>
  22. 22   <option  id="cxfs" value ="2">作者名</option>
  23. 23 </select>
  24. 24             <input type="text" id="value" name="value" placeholder="请输入条件">
  25. 25             <input type="submit" id="select" name="select" value="查询" />
  26. 26       </form>
  27. 27
  28. 28         </h1>
  29. 29         <table >
  30. 30             <tr>
  31. 31                 <td>图书编号</td>
  32. 32                 <td>书名</td>
  33. 33                 <td>作者名</td>
  34. 34                 <td>出版社名称</td>
  35. 35                 <td>可借阅数量</td>
  36. 36                 <td align="center" colspan="2">操作</td>
  37. 37             </tr>
  38. 38             <c:forEach items="${list}" var="item">
  39. 39                 <tr>
  40. 40                     <td>${item.id}</td>
  41. 41                     <td>${item.name}</td>
  42. 42                     <td>${item.writer}</td>
  43. 43                     <td>${item.press}</td>
  44. 44                     <td>${item.num}</td>
  45. 45                     <td><a href="Servlet?method=borrow&id=${item.id}&name=${item.name}&writer=${item.writer}&press=${item.press}&num=${item.num}&uid=<%=uid%> "
  46. 46                     onclick="next()">订阅</a></td>
  47. 47                 </tr>
  48. 48             </c:forEach>
  49. 49         </table>
  50. 50     </div>
  51. 51 </body>
  52. 52
  53. 53 <script type="text/javascript">
  54. 54
  55. 55         /*---------- 动态获取系统当前日期方法start ------*/
  56. 56         setInterval(
  57. 57                 "document.getElementById('sysDate').value=new Date().toLocaleString()+'  星期'+'日一二三四五六'.charAt(new Date().getDay());",
  58. 58                 1000);
  59. 59         setInterval(
  60. 60                 "document.getElementById('sysSysDate').value=new Date().toLocaleString();",
  61. 61                 1000);
  62. 62
  63. 63         /*---------- 动态获取系统当前日期方法end ------*/
  64. 64         var d = new Date();
  65. 65         d.setMonth(d.getMonth()+3);
  66. 66         d=d.toLocaleString();
  67. 67
  68. 68
  69. 69         function next(){
  70. 70             alert('订阅成功！还书日期为'+d);
  71. 71         }
  72. 72
  73. 73
  74. 74
  75. 75 </script>
  76. 76 </html>

读者查询书籍

  1.  1 <%@ page language="java" contentType="text/html; charset=UTF-8"
  2.  2     pageEncoding="UTF-8"%>
  3.  3      <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
  4.  4 <!DOCTYPE html>
  5.  5 <html>
  6.  6 <head>
  7.  7 <meta charset="UTF-8">
  8.  8 <title>我的借阅</title>
  9.  9 </head>
  10. 10 <body>
  11. 11 <%
  12. 12         Object uid = request.getAttribute("uid");
  13. 13     %>
  14. 14
  15. 15 当前用户：<%=uid%>
  16. 16 <div align="center">
  17. 17         <h1 >我的借阅</h1>
  18. 18         <h3>当前时间：<input  id="sysDate" style="font-size:18.72px;color:red;width: 320px;text-align: center;"></h3>
  19. 19
  20. 20         <table >
  21. 21             <tr>
  22. 22                 <td>图书编号</td>
  23. 23                 <td>书名</td>
  24. 24                 <td>作者名</td>
  25. 25                 <td>出版社名称</td>
  26. 26                 <td>还书日期</td>
  27. 27                 <td align="center" colspan="2">操作</td>
  28. 28             </tr>
  29. 29             <c:forEach items="${list}" var="item">
  30. 30                 <tr>
  31. 31                     <td>${item.id}</td>
  32. 32                     <td>${item.name}</td>
  33. 33                     <td>${item.writer}</td>
  34. 34                     <td>${item.press}</td>
  35. 35                     <td>${item.date}</td>
  36. 36                     <td><a href="Servlet?method=return_book&id=${item.id}&uid=<%=uid%>"
  37. 37                     >还书</a></td>
  38. 38                 </tr>
  39. 39             </c:forEach>
  40. 40         </table>
  41. 41     </div>
  42. 42
  43. 43 </body>
  44. 44 <script type="text/javascript">
  45. 45
  46. 46         /*---------- 动态获取系统当前日期方法start ------*/
  47. 47         setInterval(
  48. 48                 "document.getElementById('sysDate').value=new Date().toLocaleString()+'  星期'+'日一二三四五六'.charAt(new Date().getDay());",
  49. 49                 1000);
  50. 50         setInterval(
  51. 51                 "document.getElementById('sysSysDate').value=new Date().toLocaleString();",
  52. 52                 1000);
  53. 53
  54. 54         /*---------- 动态获取系统当前日期方法end ------*/
  55. 55
  56. 56 </script>
  57. 57 </html>

根据读者账号查询个人的借阅书籍

  1.   1 <%@ page language="java" contentType="text/html; charset=UTF-8"
  2.   2     pageEncoding="UTF-8"%>
  3.   3 <!DOCTYPE html>
  4.   4 <html>
  5.   5 <head>
  6.   6 <meta charset="UTF-8">
  7.   7 <title>添加新书信息</title>
  8.   8 </head>
  9.   9 <body>
  10.  10 <%
  11.  11         Object message = request.getAttribute("message");
  12.  12
  13.  13         if (message != null && !"".equals(message)) {
  14.  14     %>
  15.  15     <script type="text/javascript">
  16.  16               alert("<%=request.getAttribute("message")%>"); //弹出对话框
  17.  17     </script>
  18.  18     <%
  19.  19         }
  20.  20     %>
  21.  21
  22.  22 <form action="Servlet?method=insert_book" method="post">
  23.  23
  24.  24       <table id="addTable" class="table table-bordered  ">
  25.  25
  26.  26       <tr class="text-center row">
  27.  27                 <td class="col-sm-2">
  28.  28                 图书编号
  29.  29                 </td>
  30.  30                 <td class="col-sm-4">
  31.  31                     <input type="text" class="form-control"  name="id" id="id" >
  32.  32                 </td>
  33.  33        </tr>
  34.  34
  35.  35
  36.  36        <tr class="text-center row">
  37.  37                 <td class="col-sm-2">
  38.  38                 书名
  39.  39                 </td>
  40.  40                 <td class="col-sm-4">
  41.  41                        <input type="text" class="form-control"  name="name" id="name" >
  42.  42                 </td>
  43.  43        </tr>
  44.  44
  45.  45
  46.  46        <tr class="text-center row">
  47.  47                 <td class="col-sm-2">
  48.  48                 作者名
  49.  49                 </td>
  50.  50                 <td class="col-sm-4">
  51.  51                        <input type="text" class="form-control"  name="writer" id="writer" >
  52.  52                 </td>
  53.  53        </tr>
  54.  54
  55.  55        <tr class="text-center row">
  56.  56                 <td class="col-sm-2">
  57.  57                 出版社名
  58.  58                 </td>
  59.  59                 <td class="col-sm-4">
  60.  60                        <input type="text" class="form-control"  name="press" id="press" >
  61.  61                 </td>
  62.  62        </tr>
  63.  63
  64.  64        <tr class="text-center row">
  65.  65                 <td class="col-sm-2">
  66.  66                 可借阅数量
  67.  67                 </td>
  68.  68                 <td class="col-sm-4">
  69.  69                        <input type="text" class="form-control"  name="num" id="num" >
  70.  70                 </td>
  71.  71        </tr>
  72.  72
  73.  73
  74.  74
  75.  75        </table>
  76.  76             <input type="submit" value="添加" onclick="check()">
  77.  77 </form>
  78.  78 </body>
  79.  79 <script type="text/javascript">
  80.  80         function check() //封装一个<body>中做成点击事件的函数
  81.  81         {
  82.  82             if(document.getElementById('id').value=='') {
  83.  83                   alert('图书编号不能为空！');
  84.  84                   document.getElementById('id').focus();
  85.  85                   return false;
  86.  86             }
  87.  87             if(document.getElementById('name').value==''){
  88.  88                   alert('书名不能为空！');
  89.  89                     document.getElementById('name').focus();
  90.  90                     return false;
  91.  91             }
  92.  92             if(document.getElementById('writer').value=='') {
  93.  93                       alert('作者名不能为空！');
  94.  94                       document.getElementById('writer').focus();
  95.  95                       return false;
  96.  96                }
  97.  97             else if(document.getElementById('press').value==''){
  98.  98                   alert('出版社名不能为空！');
  99.  99                   document.getElementById('press').focus();
  100. 100                   return false;
  101. 101             }
  102. 102             if(document.getElementById('num').value=='') {
  103. 103                       alert('借阅数量不能为空！');
  104. 104                       document.getElementById('num').focus();
  105. 105                       return false;
  106. 106                }
  107. 107         }
  108. 108
  109. 109     </script>
  110. 110 </html>

管理员添加书籍

  1.   1 <%@ page language="java" contentType="text/html; charset=UTF-8"
  2.   2     pageEncoding="UTF-8"%>
  3.   3 <!DOCTYPE html>
  4.   4 <html>
  5.   5 <head>
  6.   6 <meta charset="UTF-8">
  7.   7 <title>添加读者信息</title>
  8.   8 </head>
  9.   9 <body>
  10.  10 <%
  11.  11         Object message = request.getAttribute("message");
  12.  12
  13.  13         if (message != null && !"".equals(message)) {
  14.  14     %>
  15.  15     <script type="text/javascript">
  16.  16               alert("<%=request.getAttribute("message")%>"); //弹出对话框
  17.  17     </script>
  18.  18     <%
  19.  19         }
  20.  20     %>
  21.  21
  22.  22 <form action="Servlet?method=insert_user" method="post">
  23.  23
  24.  24       <table id="addTable" class="table table-bordered  ">
  25.  25
  26.  26       <tr class="text-center row">
  27.  27                 <td class="col-sm-2">
  28.  28                 账号
  29.  29                 </td>
  30.  30                 <td class="col-sm-4">
  31.  31                     <input type="text" class="form-control"  name="uid" id="uid" >
  32.  32                 </td>
  33.  33        </tr>
  34.  34
  35.  35
  36.  36        <tr class="text-center row">
  37.  37                 <td class="col-sm-2">
  38.  38                 姓名
  39.  39                 </td>
  40.  40                 <td class="col-sm-4">
  41.  41                        <input type="text" class="form-control"  name="name" id="name" >
  42.  42                 </td>
  43.  43        </tr>
  44.  44
  45.  45        <tr class="text-center row">
  46.  46                 <td class="col-sm-2">
  47.  47                 密码
  48.  48                 </td>
  49.  49                 <td class="col-sm-4">
  50.  50                     <input type="text" class="form-control"  name="password" id="password" >
  51.  51                 </td>
  52.  52        </tr>
  53.  53
  54.  54               <tr>
  55.  55                 <td class="col-sm-2">
  56.  56                   性别
  57.  57                 </td>
  58.  58                 <td class="col-sm-4">
  59.  59                           <input type="radio"  name="sex" id="sex" value="男">男
  60.  60                           <input type="radio"  name="sex" id="sex" value="女">女
  61.  61                 </td>
  62.  62               </tr>
  63.  63
  64.  64
  65.  65        <tr class="text-center row">
  66.  66                 <td class="col-sm-2">
  67.  67                 所在学院
  68.  68                 </td>
  69.  69                 <td class="col-sm-4">
  70.  70                        <input type="text" class="form-control"  name="college" id="college" >
  71.  71                 </td>
  72.  72        </tr>
  73.  73
  74.  74         <tr class="text-center row">
  75.  75                 <td>
  76.  76                   身份
  77.  77                 </td>
  78.  78                 <td colspan="3">
  79.  79                   <select class="form-control" id="identity" name="identity">
  80.  80                     <option value="读者">读者</option>
  81.  81                     <option value="管理员">管理员</option>
  82.  82                   </select>
  83.  83                 </td>
  84.  84               </tr>
  85.  85
  86.  86
  87.  87        </table>
  88.  88             <input type="submit" value="添加" onclick="check()">
  89.  89 </form>
  90.  90 </body>
  91.  91 <script type="text/javascript">
  92.  92         function check() //封装一个<body>中做成点击事件的函数
  93.  93         {
  94.  94             if(document.getElementById('uid').value=='') {
  95.  95                   alert('账号不能为空！');
  96.  96                   document.getElementById('uid').focus();
  97.  97                   return false;
  98.  98             }
  99.  99             if(document.getElementById('password').value==''){
  100. 100                       alert('密码不能为空！');
  101. 101                   document.getElementById('password').focus();
  102. 102                   return false;
  103. 103               }
  104. 104             if(document.getElementById('name').value==''){
  105. 105                   alert('姓名不能为空！');
  106. 106                     document.getElementById('name').focus();
  107. 107                     return false;
  108. 108             }
  109. 109             if(document.getElementById('college').value==''){
  110. 110                   alert('所在学院不能为空！');
  111. 111                   document.getElementById('college').focus();
  112. 112                   return false;
  113. 113             }
  114. 114             if(document.getElementById('sex').value==''){
  115. 115                 alert('性别不能为空！');
  116. 116                 document.getElementById('sex').focus();
  117. 117                 return false;
  118. 118           }
  119. 119         }
  120. 120
  121. 121     </script>
  122. 122 </html>

管理员添加用户

  1.  1 <%@ page language="java" contentType="text/html; charset=UTF-8"
  2.  2     pageEncoding="UTF-8"%>
  3.  3                <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
  4.  4 <!DOCTYPE html>
  5.  5 <html>
  6.  6 <head>
  7.  7 <meta charset="UTF-8">
  8.  8 <title>删除</title>
  9.  9 </head>
  10. 10 <body>
  11. 11 <%
  12. 12         Object message = request.getAttribute("message");
  13. 13
  14. 14         if (message != null && !"".equals(message)) {
  15. 15     %>
  16. 16     <script type="text/javascript">
  17. 17               alert("<%=request.getAttribute("message")%>"); //弹出对话框
  18. 18     </script>
  19. 19     <%
  20. 20         }
  21. 21     %>
  22. 22
  23. 23     <div align="center">
  24. 24         <h1 >信息列表</h1>
  25. 25           <h1>
  26. 26         <form action="searchServlet_admin" method="post">
  27. 27         <select name="cxfs">
  28. 28   <option  id="cxfs"value ="1">书名</option>
  29. 29   <option  id="cxfs" value ="2">作者名</option>
  30. 30 </select>
  31. 31             <input type="text" id="value" name="value" placeholder="请输入条件">
  32. 32             <input type="submit" id="select" name="select" value="查询" />
  33. 33       </form>
  34. 34
  35. 35         </h1>
  36. 36         <table >
  37. 37             <tr>
  38. 38                 <td>图书编号</td>
  39. 39                 <td>书名</td>
  40. 40                 <td>作者名</td>
  41. 41                 <td>出版社名称</td>
  42. 42                 <td>可借阅数量</td>
  43. 43                 <td align="center" colspan="2">操作</td>
  44. 44             </tr>
  45. 45             <c:forEach items="${list}" var="item">
  46. 46                 <tr>
  47. 47                     <td>${item.id}</td>
  48. 48                     <td>${item.name}</td>
  49. 49                     <td>${item.writer}</td>
  50. 50                     <td>${item.press}</td>
  51. 51                     <td>${item.num}</td>
  52. 52                     <td><a href="Servlet?method=delete_book&id=${item.id}">删除</a></td>
  53. 53                 </tr>
  54. 54             </c:forEach>
  55. 55         </table>
  56. 56     </div>
  57. 57 </body>
  58. 58 </html>

管理员删除书籍

  1.  1 <meta charset="UTF-8">
  2.  2 <title>超时图书</title>
  3.  3 </head>
  4.  4 <body>
  5.  5 <%
  6.  6         Object uid = request.getAttribute("uid");
  7.  7     %>
  8.  8
  9.  9 当前用户：<%=uid%>
  10. 10 <div align="center">
  11. 11         <h1 >催还书目</h1>
  12. 12         <h3>当前时间：<input  id="sysDate" style="font-size:18.72px;color:red;width: 320px;text-align: center;"></h3>
  13. 13 <div id="dy">
  14. 14         <table >
  15. 15             <tr>
  16. 16                 <td>图书编号</td>
  17. 17                 <td>书名</td>
  18. 18                 <td>作者名</td>
  19. 19                 <td>出版社名称</td>
  20. 20                 <td>还书日期</td>
  21. 21                 <td>借阅人</td>
  22. 22             </tr>
  23. 23             <c:forEach items="${list}" var="item">
  24. 24                 <tr>
  25. 25                     <td>${item.id}</td>
  26. 26                     <td>${item.name}</td>
  27. 27                     <td>${item.writer}</td>
  28. 28                     <td>${item.press}</td>
  29. 29                     <td>${item.date}</td>
  30. 30                     <td>${item.borrower}</td>
  31. 31                 </tr>
  32. 32             </c:forEach>
  33. 33         </table>
  34. 34         </div>
  35. 35     </div>
  36. 36         <br>
  37. 37         <table align="center">
  38. 38         <tr><td>
  39. 39         <input type="button" value="打    印"  onclick="PrintTable(dy)">
  40. 40         </td></tr>
  41. 41            </table>
  42. 42 </body>
  43. 43
  44. 44 <script type="text/javascript">
  45. 45
  46. 46         /*---------- 动态获取系统当前日期方法start ------*/
  47. 47         setInterval(
  48. 48                 "document.getElementById('sysDate').value=new Date().toLocaleString()+'  星期'+'日一二三四五六'.charAt(new Date().getDay());",
  49. 49                 1000);
  50. 50         setInterval(
  51. 51                 "document.getElementById('sysSysDate').value=new Date().toLocaleString();",
  52. 52                 1000);
  53. 53
  54. 54         /*---------- 动态获取系统当前日期方法end ------*/
  55. 55
  56. 56         function PrintTable(Id){
  57. 57         var mStr;
  58. 58         mStr = window.document.body.innerHTML ;
  59. 59         var mWindow = window;
  60. 60         window.document.body.innerHTML =Id.innerHTML;
  61. 61         mWindow.print();
  62. 62         window.document.body.innerHTML = mStr;
  63. 63 }
  64. 64
  65. 65 </script>
  66. 66
  67. 67 </html>

管理员查看有哪些书籍超出借阅时间还没有归还

6.总结

1.增加了登录验证功能，账号信息在数据库中存在才能登录。

2.将账号信息进行跳转传递，在主页显示当前用户

3.完善了图书借阅相关功能，例如查询个人借阅(通过账号信息的参数传递实现)以及催还书目名单打印(JS调用浏览器打印功能)。

4.增加了更多的窗口提示，提升对用户的友好度。

7.数据库后台建表

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