1, 注册页面

  1.  <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN" "http://www.w3.org/TR/html4/strict.dtd">
  2.  <html>
  3.  <head>
  4.  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  5.  <title>用户注册</title>
  6.  </head>
  7.  <body>
  8.  <form id="uform" action="saveuser" method="post">
  9.  用户代码：<input id="userid" type="text" name="userid" width=30 />
  10.  <br><br>
  11.  用户名称：<input id="username" type="text" name="username" width=30 />
  12.  <br><br>
  13.  登录密码：<input id="password" type="password" name="password" width=30 />
  14.  <br><br>
  15.  确认密码：<input id="queren" type="password" name="queren" width=30 />
  16.  <br><br>
  17.  <input type="submit" value="注册" /><br><a href="findoracle">显示所有用户</a>
  18.  </form>
  19.  </body>
  20.  </html>

2, 保存用户数据

  1.  package com.hanqi;
  2.  
  3.  import java.io.IOException;
  4.  import java.sql.Connection;
  5.  import java.sql.DriverManager;
  6.  import java.sql.*;
  7.  import javax.servlet.ServletException;
  8.  import javax.servlet.http.HttpServlet;
  9.  import javax.servlet.http.HttpServletRequest;
  10.  import javax.servlet.http.HttpServletResponse;
  11.  
  12.  public class saveuser extends HttpServlet {
  13.      private static final long serialVersionUID = 1L;
  14.  
  15.      public saveuser() {
  16.          super();
  17.      }
  18.  
  19.      protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  20.          request.setCharacterEncoding("UTF-8");                            //设置字符集
  21.          response.setContentType("text/html; charset=UTF-8");
  22.          response.setCharacterEncoding("UTF-8");
  23.          String strUserid = request.getParameter("userid");             //获取传递过来的参数
  24.          String strUsername = request.getParameter("username");
  25.          String strPW = request.getParameter("password");
  26.          if(strUserid == null||strUserid.trim().length()==0) {              //判断获取的参数是否为空
  27.              response.getWriter().append("用户ID不能为空");
  28.          }
  29.          else if(strUsername == null||strUsername.trim().length()==0) {
  30.              response.getWriter().append("用户名称不能为空");
  31.          }
  32.          else {
  33.              try {
  34.                  Class.forName("oracle.jdbc.driver.OracleDriver");                    //注册Oracle
  35.                  String url = "jdbc:oracle:thin:@localhost:1521:orcl";               //设置连接oracle数据库
  36.                  Connection conn = DriverManager.getConnection(url, "test1204", "1234");           //登录oracle, 连接oracle用户
  37.                      if(conn!=null) {
  38.                          //操作数据库
  39.                          String sql = "insert into T_Test (user_id, user_name, password)"+"values(?,?,?)";         //设置oracle语句的命令
  40.                          //执行语句的类
  41.                          PreparedStatement ps = conn.prepareStatement(sql);           //创建类ps, 并下达执行命令
  42.                          //strUsername = new String(strUsername.getBytes("iso-8859-1"),"utf-8");
  43.                          //转码的问题, 当这个页面接收过来的参数是以post方法传来的, 完全可以只用一个setCharacterEncoding("UTF-8");就能进行转码
  44.                          ps.setString(1, strUserid);            //设置写入oracle表中的值
  45.                          ps.setString(2, strUsername);
  46.                          ps.setString(3, strPW);
  47.                          int row = ps.executeUpdate();          //执行语句的命令并返回数据行数
  48.                          if(row>0) {
  49.                              response.getWriter().append("保存数据成功, 保存"+row+"条数据成功!");
  50.                          }
  51.                          else {
  52.                              response.getWriter().append("保存数据失败");
  53.                          }
  54.                          ps.close();
  55.                          conn.close();
  56.                      }
  57.                      else
  58.                      {
  59.                          response.getWriter().append("连接数据库失败");
  60.                      }
  61.                             } catch (Exception e) {
  62.                  e.printStackTrace();
  63.                  response.getWriter().append(e.getMessage());
  64.              }
  65.          }
  66.      response.getWriter().append("<br><a href='zhuce.html'>返回注册</a>");
  67.      response.getWriter().append("<br><a href='findoracle'>显示所有用户</a>");
  68.      }
  69.  
  70.      protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  71.          doGet(request, response);
  72.      }
  73.  }

3, 工具类

  1.  package com.hanqi;
  2.  //关于用户的实体类
  3.  public class User {
  4.      //用户代码
  5.      private String UserID;
  6.  public String getUserID()
  7.      {
  8.          return UserID;
  9.      }
  10.  public void setUserID(String UID)
  11.      {
  12.          this.UserID = UID;
  13.      }
  14.  
  15.      //用户名称
  16.      private String UserName;
  17.  public String getUserName()
  18.      {
  19.          return UserName;
  20.      }
  21.  public void setUserName(String userName)
  22.      {
  23.          UserName = userName;
  24.      }
  25.  
  26.      //密码
  27.      private String PassWord;
  28.  public String getPassWord()
  29.      {
  30.          return PassWord;
  31.      }
  32.  public void setPassWord(String passWord)
  33.      {
  34.          PassWord = passWord;
  35.      }
  36.  }
  37.  
  38.  //定义连接数据库的方体
  39.  package com.hanqi;
  40.  
  41.  import java.sql.*;
  42.  
  43.  public class DBHelper {
  44.      public static Connection getconnection() throws Exception {
  45.          Class.forName("oracle.jdbc.driver.OracleDriver");
  46.          String url = "jdbc:oracle:thin:@localhost:1521:orcl";
  47.          Connection conn = DriverManager.getConnection(url, "test1204", "1234");
  48.          return conn;
  49.      }
  50.  
  51.  }

4, 修改数据

  1.  package oraclejdbc;
  2.  
  3.  import java.io.IOException;
  4.  import java.sql.Connection;
  5.  import java.sql.DriverManager;
  6.  import java.sql.PreparedStatement;
  7.  
  8.  import javax.servlet.ServletException;
  9.  import javax.servlet.http.HttpServlet;
  10.  import javax.servlet.http.HttpServletRequest;
  11.  import javax.servlet.http.HttpServletResponse;
  12.  
  13.  import com.hanqi.DBHelper;
  14.  
  15.  public class Edit extends HttpServlet {
  16.      private static final long serialVersionUID = 1L;
  17.  
  18.      public Edit() {
  19.          super();
  20.      }
  21.  
  22.      protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  23.          request.setCharacterEncoding("UTF-8");                            //设置字符集
  24.          response.setContentType("text/html; charset=UTF-8");
  25.          String strUserid = request.getParameter("userid");             //获取传递过来的参数
  26.          String strUsername = request.getParameter("username");
  27.          String strPW = request.getParameter("password");
  28.          if(strUserid == null||strUserid.trim().length()==0) {              //判断获取的参数是否为空
  29.              response.getWriter().append("用户ID不能为空");
  30.          }
  31.          else if(strUsername == null||strUsername.trim().length()==0) {
  32.              response.getWriter().append("用户名称不能为空");
  33.          }
  34.          else {
  35.              try {
  36.                  Class.forName("oracle.jdbc.driver.OracleDriver");                    //注册Oracle
  37.                  String url = "jdbc:oracle:thin:@localhost:1521:orcl";               //设置连接oracle数据库
  38.                  Connection conn = DBHelper.getconnection();
  39.                      if(conn!=null) {                                                      //to_date （ ‘2007-12-20 18:31:34’ ， ‘YYYY-MM-DD HH24:MI:SS’ ）
  40.                          //操作数据库
  41.                          String sql = "update T_Test set user_name=?, password=?"+"where user_id=?";         //设置oracle语句的命令
  42.                          //执行语句的类
  43.                          PreparedStatement ps = conn.prepareStatement(sql);           //创建类ps, 并下达执行命令
  44.                          ps.setString(1, strUsername);            //设置写入oracle表中的值
  45.                          ps.setString(2, strPW);
  46.                          ps.setString(3, strUserid);
  47.                          int row = ps.executeUpdate();          //执行语句的命令并返回数据行数
  48.                          ps.close();
  49.                          conn.close();
  50.                          response.sendRedirect("findoracle");
  51.                      }
  52.                      else
  53.                      {
  54.                          response.getWriter().append("连接数据库失败");
  55.                      }
  56.                             } catch (Exception e) {
  57.                  response.getWriter().append(e.getMessage());
  58.              }
  59.          }
  60.      }
  61.  
  62.      protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  63.          doGet(request, response);
  64.      }
  65.  }

5, 删除数据(包括提交事务, 添加日志)

  1.  package oraclejdbc;
  2.  
  3.  import java.io.IOException;
  4.  import javax.servlet.ServletException;
  5.  import javax.servlet.http.HttpServlet;
  6.  import javax.servlet.http.HttpServletRequest;
  7.  import javax.servlet.http.HttpServletResponse;
  8.  import com.hanqi.DBHelper;
  9.  
  10.  import java.sql.*;
  11.  
  12.  public class oracledelete extends HttpServlet {
  13.      private static final long serialVersionUID = 1L;
  14.  
  15.      public oracledelete() {
  16.          super();
  17.      }
  18.  
  19.      protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  20.          request.setCharacterEncoding("UTF-8");                            //设置字符集
  21.          response.setContentType("text/html; charset=UTF-8");
  22.          response.setCharacterEncoding("UTF-8");
  23.          String userid = request.getParameter("userid");
  24.  
  25.      try {
  26.              Connection conn = DBHelper.getconnection();
  27.              if(userid!=null&&userid.trim().length()>0) {
  28.                  conn.setAutoCommit(false);
  29.                  //可以直接组合语句, 但是这样有一定的风险, 当后面的参数值比较多的时候容易遗漏
  30.                  //String sql = "delete from t_test where user_id = '"+userid+"'";
  31.                  String sql = "delete from t_test where user_id = ?";
  32.                  PreparedStatement pst = conn.prepareStatement(sql);
  33.                  pst.setString(1, userid.trim());
  34.                  int row = pst.executeUpdate();
  35.                  //保存日志
  36.                  try {
  37.                          //构建sql语句
  38.                          sql = "insert into t_log (log_id, log, create_time) values(sq_log_id.nextval,?,?)";
  39.                          pst = conn.prepareStatement(sql);
  40.                          pst.setString(1, "删除了"+userid.trim()+"的记录");
  41.                          //实例化一个时间
  42.                          java.util.Date dt = new java.util.Date();
  43.                          //java.sql.Date d = new java.sql.Date(dt.getTime());               //只是生成一个日期的值
  44.                          java.sql.Time d = new java.sql.Time(dt.getTime());                 //日期和时间都会生成
  45.                          pst.setTime(2, d);
  46.                          pst.executeUpdate();                   //执行构建的语句
  47.                          conn.commit();
  48.                         }
  49.                  catch(Exception ex) {
  50.                              conn.rollback();
  51.                              //response.getWriter().append("写入日志时出错");
  52.                          }
  53.                  finally {                      //使用finally关键字, 不管出错与否, 都要释放资源
  54.                      try {
  55.                              pst.close();
  56.                              conn.close();
  57.                      }
  58.                      catch(Exception ex1) {
  59.                          conn.close();
  60.                      }
  61.                  }
  62.              }
  63.              else {
  64.                  response.getWriter().append("userid不能为空");
  65.              }
  66.           }
  67.      catch (Exception e) {
  68.                  response.getWriter().append(e.getMessage()+"异常信息");
  69.              }
  70.      response.sendRedirect("findoracle");
  71.      }
  72.  
  73.      protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  74.          // TODO Auto-generated method stub
  75.          doGet(request, response);
  76.      }
  77.  }

6, 批处理数据

  1. package oraclejdbc;
  2.  
  3. import java.io.IOException;
  4. import javax.servlet.ServletException;
  5. import javax.servlet.http.HttpServlet;
  6. import javax.servlet.http.HttpServletRequest;
  7. import javax.servlet.http.HttpServletResponse;
  8.  
  9. import com.hanqi.DBHelper;
  10.  
  11. import java.sql.*;
  12. import java.util.*;
  13.  
  14. public class BatchAdd extends HttpServlet {
  15.     private static final long serialVersionUID = 1L;
  16.  
  17.     public BatchAdd() {
  18.         super();
  19.     }
  20.  
  21.     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  22.         request.setCharacterEncoding("UTF-8");                            //设置字符集
  23.         response.setContentType("text/html; charset=UTF-8");
  24.         response.setCharacterEncoding("UTF-8");
  25.         PreparedStatement pps = null;
  26.         Connection conn = null;
  27.         try {
  28.             conn = DBHelper.getconnection();
  29.             if(conn!=null) {
  30.                 try {
  31.                 //批量插入
  32.                 String sql = "insert into t_test(user_id, user_name, password) values(?,?,?)";
  33.                 pps = conn.prepareStatement(sql);
  34.                 Random rd = new Random();
  35.                 //用for循环控制插入的个数
  36.                 for(int i = 0; i<10; i++) {
  37.                     int m = rd.nextInt(1000);
  38.                     pps.setString(1, ""+m);
  39.                     pps.setString(2, "abc"+i);
  40.                     pps.setString(3, ""+(++i+119));
  41.                     pps.addBatch();
  42.                 }
  43.                 int[] n = pps.executeBatch();                      //返回值是一个int[]型数组, 如果插入成功的话, 那数组的每个值都是 -2
  44.                 response.getWriter().append("已添加"+n.length+"条数据");
  45.                 } catch(Exception e2) {
  46.                     response.getWriter().append(e2.getMessage());
  47.                 }
  48.                 finally {
  49.                         pps.close();
  50.                         conn.close();
  51.                 }
  52.             }             //这个括号是if 的
  53.         } catch(Exception e) {
  54.             response.getWriter().append(e.getMessage());
  55.         }
  56.     }
  57.  
  58.     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  59.         doGet(request, response);
  60.     }
  61. }

7, 显示数据

  1.  package com.hanqi;
  2.  
  3.  import java.io.IOException;
  4.  import java.sql.Connection;
  5.  import java.sql.DriverManager;
  6.  import java.sql.*;
  7.  import java.util.*;
  8.  import javax.servlet.ServletException;
  9.  import javax.servlet.ServletRequest;
  10.  import javax.servlet.http.HttpServlet;
  11.  import javax.servlet.http.HttpServletRequest;
  12.  import javax.servlet.http.HttpServletResponse;
  13.  
  14.  public class findoracle extends HttpServlet {
  15.      private static final long serialVersionUID = 1L;
  16.  
  17.      public findoracle() {
  18.          super();
  19.      }
  20.  
  21.      protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  22.          request.setCharacterEncoding("UTF-8");                            //设置字符集
  23.          response.setContentType("text/html; charset=UTF-8");
  24.          try {
  25.              //这三行可以封装一个类
  26.              Class.forName("oracle.jdbc.driver.OracleDriver");                    //注册Oracle驱动
  27.              String url = "jdbc:oracle:thin:@localhost:1521:orcl";               //设置连接oracle数据库
  28.              Connection conn = DriverManager.getConnection(url, "test1204", "1234");           //登录oracle, 连接oracle用户
  29.                  if(conn!=null) {
  30.                      //操作数据库
  31.                      String sql = "select * from t_test";         //设置oracle语句的命令
  32.                      //strUsername = new String(strUsername.getBytes("iso-8859-1"),"utf-8");         //转码
  33.                      Statement stm = conn.createStatement();
  34.                      //执行查询语句, 返回值为ResultSet结果集
  35.                      ResultSet rs = stm.executeQuery(sql);
  36.                      ArrayList<User> array = new ArrayList<User>();
  37.                      //User u = new User();
  38.                      if(rs!=null) {
  39.                          //遍历查询结果
  40.                          while(rs.next()) {           //next();判断rs是否有下一个值, 返回的是一个bealoon型数据
  41.                              User u = new User();
  42.                              //取出结果集中的value, 也可以写成"u.setUserID(rs.getString(int));"
  43.                              u.setUserID(rs.getString("user_id"));
  44.                              u.setUserName(rs.getString("user_name"));
  45.                              u.setPassWord(rs.getString("password"));
  46.                              //将取出的结果添加到一个集合中去, 这里集合的内容会经常用到, Result型结果集取出后通常都放在集合里面
  47.                              array.add(u);
  48.                              //response.getWriter().append(u.getUserID()+u.getUserName()+u.getPassWord()+"<br>");
  49.                          }
  50.                          request.setAttribute("userlist", array);
  51.                          conn.close();
  52.                          stm.close();
  53.                          rs.close();
  54.                      }
  55.                      else {
  56.                          response.getWriter().append("无查询结果");
  57.                      }
  58.                  }
  59.                  else {
  60.                      response.getWriter().append("连接数据库失败");
  61.                  }
  62.                         } catch (Exception e) {
  63.              response.getWriter().append(e.getMessage());
  64.          }
  65.          //跳转页面
  66.          request.getRequestDispatcher("show.jsp").forward(request, response);
  67.          //response.sendRedirect("show");这个语句不起作用的
  68.      }
  69.  
  70.      protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  71.          doGet(request, response);
  72.      }
  73.  
  74.  }

8, 显示页面

  1.  <%@ page language="java" contentType="text/html; charset=UTF-8"
  2.      pageEncoding="UTF-8"%>
  3.  <%@ page import="java.util.*" %>
  4.  <%@ page import="com.hanqi.*" %>
  5.  <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  6.  <html>
  7.  <head>
  8.  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  9.  <title>显示查询结果</title>
  10.  </head>
  11.  <body>
  12.  <%
  13.  Object obj = request.getAttribute("userlist");
  14.  if(obj!=null) {
  15.      ArrayList<User> array = (ArrayList<User>)obj;
  16.      //foreach遍历,输出结果的时候写一个out.print("");就可以了,为了看的直观写了好几个out.print("");
  17.      for(User u:array) {
  18.          out.print(u.getUserID()+"/ "+u.getUserName()+"/ "+u.getPassWord()+"<br>");
  19.          out.print("\t <a href='oracledelete?userid="+u.getUserID()+"'>删除</a><br>");
  20.          out.print("<form action='Edit' method='post'>");
  21.          //设置隐藏域的意义在于, 修改用户名和密码的时候必须先将用户代码取出作为唯一的值, 修改完再将用户代码传回表中
  22.          out.print("<input type='hidden' name='userid' value='"+u.getUserID()+"'/>");             //隐藏域的应用
  23.          out.print("用户名称:<input type='text' name='username' value='"+u.getUserName()+"' /><br>");
  24.          out.print("用户密码:<input type='text' name='password' value='"+u.getPassWord()+"' /><br>");
  25.          out.print("<input type='submit' value='修改' />");
  26.          out.print("</form>");
  27.          out.print("<br>"+"———————————————————"+"<br>");
  28.      }
  29.  }
  30.  else {
  31.      out.print("无数据返回");
  32.  }
  33.  %>
  34.  <br>
  35.  <a href="zhuce.html">注册用户信息</a><br><br><a href="BatchAdd">批量添加用户</a>
  36.  </body>
  37.  </html>

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