(MVC)javaBaen+jsp+servlet对数据的操作

运用MVC对数据进行一些简单的处理，基本实现数据的增删改查，达到前端和后台的数据之间的交互。

1.开始界面

 <%@page import="com.zdsofe.work.Student"%>

 <%@page import="java.util.List"%>

 <%@page import="com.zdsofe.work.ReadData"%>

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 <script type="text/javascript" src="../js/jquery-1.7.2.js"></script>

 <script type="text/javascript">

 function fun1() {

     $(":checkbox").attr("checked","checked");

 }

   function fun2() {

       $(":checkbox").attr("checked",false);

 }

 </script>

 </head>

 <body>

 <% ReadData rd=new ReadData();

  List<Student> list= rd.findInfo();

 %>

 <form action="../MoreDeleteServlet" >

 <table border="1">

 <tr> <td colspan="4"><button type="button" onclick="fun1()">全选</button>

         <button type="button" onclick="fun2()">全不选</button></td></tr>

 <tr>

 <th>序号</th>

 <th>名字</th>

 <th>密码</th>

 <th>操作</th>

 </tr>

 <%

 for(int i=0;i<list.size();i++)

 {

     %>

     <tr>

     <td><%=list.get(i).getId()%></td>

     <td><%=list.get(i).getUserName()%></td>

     <td><%=list.get(i).getMima()%></td>

     <td>

          <input type="checkbox" name="c" value="<%=list.get(i).getId()%>"/>

          <a href="../servlet?userI=<%=list.get(i).getId()%>">修改</a>

          <a href="../DeleteServlet?userI=<%=list.get(i).getId()%>">删除</a>

     </td>

     </tr>

 <%

   }

 %>

 <tr>

     <td colspan="4"><a href="addData.jsp" style="text-decoration: none;">增加</a>

                     <button type="submit">批量删除</button>

     </td>

     </tr>

 </table>

 </form>

 <form action="../DimServlet">

  <select name="se">

  <option value="id">序号</option>

  <option value="name">姓名</option>

  </select>

  <input type="text" name="in"/>

  <button type="submit">模糊查询</button>

 </form>

 </body>

 </html>

2.增加数据的界面

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <body>

 <form action="../AddServlet" method="post">

 用户名：<input type="text" name="userName" ><br/>

 密码：<input type="password" name="mima" ><br/>

 ID:<input type="text" name="id" />

 <button type="submit">提交</button>

 </form>

 </body>

 </html>

3.修改数据的界面

 <%@page import="com.zdsofe.work.Student"%>

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <%

 //获取用户信息

    Student stu=(Student)session.getAttribute("user");

 %>

 <body>

 <form action="../EditServlet" method="post">

 用户名：<input type="text" name="userName" value="<%=stu.getUserName()%>"><br/>

 密码：<input type="password" name="mima" value="<%=stu.getMima()%>"><br/>

 ID:<input type="text" name="id" value="<%=stu.getId()%>"/>

 <button type="submit">提交</button>

 </form>

 </body>

 </html>

4.模糊查询后的界面

 <%@page import="com.zdsofe.work.Student"%>

 <%@page import="java.util.List"%>

 <%@page import="com.zdsofe.work.ReadData"%>

 <%@ page language="java" contentType="text/html; charset=UTF-8"

     pageEncoding="UTF-8"%>

 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

 <html>

 <head>

 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

 <title>Insert title here</title>

 </head>

 <% ReadData rd=new ReadData();

    String se=session.getAttribute("se").toString();

    String in=session.getAttribute("in").toString();

    List<Student> list= rd.findDim(se,in);

 %>

 <body>

 <table border="1">

 <tr>

 <th>序号</th>

 <th>名字</th>

 <th>密码</th>

 <th>操作</th>

 </tr>

 <%

 for(int i=0;i<list.size();i++)

 {

     %>

     <tr>

     <td><%=list.get(i).getId()%></td>

     <td><%=list.get(i).getUserName()%></td>

     <td><%=list.get(i).getMima()%></td>    

     <td>

         <a href="../servlet?userI=<%=list.get(i).getId()%>">修改</a>

         <a href="../DeleteServlet?userI=<%=list.get(i).getId()%>">删除</a>

     </td>

     </tr>

 <%

   }

 %>

 <tr>

     <td colspan="4"><a href="addData.jsp">增加</a>                    

     </td>

     </tr>

 </table>

 </body>

 </html>

5.连接数据库的工具类

 package com.zdsofe.util;

 import java.sql.Connection;

 import java.sql.DriverManager;

 import java.sql.SQLException;

 public class DBUtil {

     private static String DRIVER="com.mysql.jdbc.Driver";

     private static String URL="jdbc:mysql://localhost:3306/mysql";

     private static String user="root";

     private static String key="775297";

     public static Connection conn;

     //加载驱动

         static{

             try {

                 Class.forName(DRIVER);

             } catch (ClassNotFoundException e) {

                 e.printStackTrace();

             }

         }

         //连接数据库

         public static Connection getConnection(){

          try {

             conn = DriverManager.getConnection(URL, user, key);

         } catch (SQLException e) {

             e.printStackTrace();

         }

             return conn;

         }

 }

6.实体类

 package com.zdsofe.work;

 public class Student {

  public String id;

  public  String userName;

  public  String mima;

 public Student(String id, String userName, String mima) {

     super();

     this.id = id;

     this.userName = userName;

     this.mima = mima;

 }

 public Student(String userName, String mima) {

     this.userName = userName;

     this.mima = mima;

 }

 public Student() {

     super();

 }

 public String getId() {

     return id;

 }

 public void setId(String id) {

     this.id = id;

 }

 public String getUserName() {

     return userName;

 }

 public void setUserName(String userName) {

     this.userName = userName;

 }

 public String getMima() {

     return mima;

 }

 public void setMima(String mima) {

     this.mima = mima;

 }

 }

7.一些实现功能的静态方法

 package com.zdsofe.work;

 import java.sql.ResultSet;

 import java.sql.SQLException;

 import java.sql.Statement;

 import java.util.ArrayList;

 import java.util.List;

 import com.zdsofe.util.DBUtil;

 public class ReadData {

     //查询信息

     public static List<Student> findInfo() {

         List <Student>list=new ArrayList<>();

         //调用连接并创建SQL语句

         try {

             Statement stam= DBUtil.getConnection().createStatement();

             String sql="SELECT id,userName,mima FROM  denglu;";

             ResultSet rs=stam.executeQuery(sql);

             while(rs.next())

             {

                 String id=rs.getString("id");

                 String userName=rs.getString("userName");

                 String mima=rs.getString("mima");

                 Student stu=new Student(id,userName,mima);

                 list.add(stu);

             }

         } catch (SQLException e) {

             e.printStackTrace();

         }

         return list;

     }

     //模糊查询

     public static List<Student> findDim(String se,String in ) {

         List <Student>list=new ArrayList<>();

         if(se.equals("id"))

             {  //调用连接并创建SQL语句

               try {

                 Statement stam= DBUtil.getConnection().createStatement();

                 String sql="select * from denglu where id like '%"+in+"%'";

                 ResultSet rs=stam.executeQuery(sql);

                 while(rs.next())

                 {

                     String id=rs.getString("id");

                     String userName=rs.getString("userName");

                     String mima=rs.getString("mima");

                     Student stu=new Student(id,userName,mima);

                     list.add(stu);

                 }

             } catch (SQLException e) {

                 e.printStackTrace();

             }

         }

         if(se.equals("name"))

         {

              try {

                     Statement stam= DBUtil.getConnection().createStatement();

                     String sql="select * from denglu where userName like '%"+in+"%'";

                     ResultSet rs=stam.executeQuery(sql);

                     while(rs.next())

                     {

                         String id=rs.getString("id");

                         String userName=rs.getString("userName");

                         String mima=rs.getString("mima");

                         Student stu=new Student(id,userName,mima);

                         list.add(stu);

                     }

                 } catch (SQLException e) {

                     e.printStackTrace();

                 }

         }

         return list;

     }

      /* 根据用户名查询用户信息

      * @param userName

      * @return

      */

     public static Student findUserByName(String id)

     {

         Student stu=null;

         //输出查询sql

         String sql = "select * from denglu t where t.id='"+id+"'";

         try {

             //调用连接并创建SQL语句

             Statement stam= DBUtil.getConnection().createStatement();

             ResultSet rs=stam.executeQuery(sql);

             if(rs.next())

             {

                 String i=rs.getString("id");

                 String name=rs.getString("userName");

                 String mima=rs.getString("mima");

                 stu=new Student(i,name,mima);

             }

         } catch (SQLException e) {

             e.printStackTrace();

         }

         return stu;

     }

     /**

      * 根据编码修改用户信息

      * @param user

      * @return

      */

     public static int update(Student stu)

     {

         //执行sql的结果

         int result = 0;

         //更新sql

         String sql = "update denglu t set t.userName='"+stu.getUserName()+"',t.mima = '"+stu.getMima()+"' where t.id ='"+stu.getId()+"'";

         try {

         Statement stam=    DBUtil.getConnection().createStatement();

             result=stam.executeUpdate(sql);

         } catch (SQLException e) {

             e.printStackTrace();

         }

         return result;

     }

 }

8.查询数据的servlet

 package com.zdsofe.work;

 import java.io.IOException;

 import java.sql.ResultSet;

 import java.sql.SQLException;

 import java.sql.Statement;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import javax.servlet.http.HttpSession;

 import com.zdsofe.util.DBUtil;

 /**

  * Servlet implementation class servlet

  */

 @WebServlet("/servlet")

 public class servlet extends HttpServlet {

     private static final long serialVersionUID = 1L;

     /**

      * @see HttpServlet#HttpServlet()

      */

     public servlet() {

         super();

         // TODO Auto-generated constructor stub

     }

     /**

      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

      */

     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         //解决乱码问题

         request.setCharacterEncoding("utf-8");

         response.setCharacterEncoding("utf-8");

         response.setContentType("text/html charset=utf-8");

        //获取用户id：

         String userI = request.getParameter("userI");

        //根据用户id查询某一条用户信息

         Student stu=ReadData.findUserByName(userI);

         HttpSession session = request.getSession();

         session.setAttribute("user", stu);

         session.setAttribute("title", "修改用户");

         response.sendRedirect(request.getContextPath()+"/pages/edit.jsp");

     }

     /**

      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

      */

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

     }

 }

9..增加数据的servlet

 package com.zdsofe.work;

 import java.io.IOException;

 import java.sql.SQLException;

 import java.sql.Statement;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import com.zdsofe.util.DBUtil;

 /**

  * Servlet implementation class AddServlet

  */

 @WebServlet("/AddServlet")

 public class AddServlet extends HttpServlet {

     private static final long serialVersionUID = 1L;

     /**

      * @see HttpServlet#HttpServlet()

      */

     public AddServlet() {

         super();

         // TODO Auto-generated constructor stub

     }

     /**

      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

      */

     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         // TODO Auto-generated method stub

     }

     /**

      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

      */

     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         int i=0;

         //请求和响应页面的编码格式修改

         request.setCharacterEncoding("UTF-8");

         response.setCharacterEncoding("utf-8");

         response.setContentType("text/html charset=utf-8");

         String sql="insert into denglu values('"+request.getParameter("id")+"','"+request.getParameter("userName")+"','"+request.getParameter("mima")+"')";

         try {

             Statement stam=DBUtil.getConnection().createStatement();

             i=stam.executeUpdate(sql);

         } catch (SQLException e) {

             e.printStackTrace();

         }

         if(i==1)

         {

             response.sendRedirect(request.getContextPath()+"/pages/student.jsp");

         }

     }

 }

10.删除数据的servlet

 package com.zdsofe.work;

 import java.io.IOException;

 import java.sql.SQLException;

 import java.sql.Statement;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import com.zdsofe.util.DBUtil;

 /**

  * Servlet implementation class DeleteServlet

  */

 @WebServlet("/DeleteServlet")

 public class DeleteServlet extends HttpServlet {

     private static final long serialVersionUID = 1L;

     /**

      * @see HttpServlet#HttpServlet()

      */

     public DeleteServlet() {

         super();

         // TODO Auto-generated constructor stub

     }

     /**

      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

      */

     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

                 //获取要删除的用户ID

                 String userId = request.getParameter("userI");

                 //删除的sql语句

                 String sql = "delete from denglu  where id = "+userId+"";

             try {

                 Statement stam=    DBUtil.getConnection().createStatement();

                 stam.executeUpdate(sql);

             } catch (SQLException e) {

                 // TODO Auto-generated catch block

                 e.printStackTrace();

             }

             response.sendRedirect(request.getContextPath()+"/pages/student.jsp");

     }

     /**

      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

      */

     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         // TODO Auto-generated method stub

     }

 }

11.模糊查询的servlet

 package com.zdsofe.work;

 import java.io.IOException;

 import java.sql.ResultSet;

 import java.sql.SQLException;

 import java.sql.Statement;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import com.zdsofe.util.DBUtil;

 /**

  * Servlet implementation class DimServlet

  */

 @WebServlet("/DimServlet")

 public class DimServlet extends HttpServlet {

     private static final long serialVersionUID = 1L;

     /**

      * @see HttpServlet#HttpServlet()

      */

     public DimServlet() {

         super();

         // TODO Auto-generated constructor stub

     }

     /**

      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

      */

     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         //请求和响应页面的编码格式修改

         request.setCharacterEncoding("UTF-8");

         response.setCharacterEncoding("utf-8");

         response.setContentType("text/html charset=utf-8");

         //获取输入的模糊数据

         String se=request.getParameter("se");

         String in=request.getParameter("in");

         ReadData.findDim(se,in);

         request.getSession().setAttribute("se", se);

         request.getSession().setAttribute("in", in);

        /* request.getRequestDispatcher("/pages/newStudent.jsp").forward(request, response);*/

         response.sendRedirect(request.getContextPath()+"/pages/newStudent.jsp");

     }

     /**

      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

      */

     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

     }

 }

12.修改数据的servlet

 package com.zdsofe.work;

 import java.io.IOException;

 import java.lang.reflect.InvocationTargetException;

 import java.util.Enumeration;

 import java.util.HashMap;

 import java.util.Map;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import org.apache.commons.beanutils.BeanUtils;

 /**

  * Servlet implementation class EditServlet

  */

 @WebServlet("/EditServlet")

 public class EditServlet extends HttpServlet {

     private static final long serialVersionUID = 1L;

     /**

      * @see HttpServlet#HttpServlet()

      */

     public EditServlet() {

         super();

         // TODO Auto-generated constructor stub

     }

     /**

      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

      */

     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

                 //请求和响应页面的编码格式修改

                 request.setCharacterEncoding("UTF-8");

                 response.setCharacterEncoding("utf-8");

                 response.setContentType("text/html charset=utf-8");

                 /*//获取表单中的所用控件name属性

                 Enumeration<String> en = request.getParameterNames();

                 Map<String, Object> mapObj = new HashMap<>();

                 //实例化一个Student对象

                 Student stu=new Student();

                 while(en.hasMoreElements())

                 {

                     String rs = en.nextElement();

                     mapObj.put(rs, request.getParameter("rs"));

                 }

                 try {

                     BeanUtils.populate(stu, mapObj);

                 } catch (IllegalAccessException | InvocationTargetException e) {

                     e.printStackTrace();

                 }*/

                 String name=request.getParameter("userName");

                 String mima=request.getParameter("mima");

                 String id=request.getParameter("id");

                 Student stu=new Student(id,name,mima);

                 //根据条件修改用户信息，调用执行sql方法

                 int upResult = ReadData.update(stu);

                 if(upResult==1)

                 {

                     response.sendRedirect(request.getContextPath()+"/pages/student.jsp");

                 }

     }

     /**

      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

      */

     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         doGet(request, response);

     }

 }

13.删除多个的servlet

 package com.zdsofe.work;

 import java.io.IOException;

 import java.sql.SQLException;

 import java.sql.Statement;

 import javax.servlet.ServletException;

 import javax.servlet.annotation.WebServlet;

 import javax.servlet.http.HttpServlet;

 import javax.servlet.http.HttpServletRequest;

 import javax.servlet.http.HttpServletResponse;

 import com.zdsofe.util.DBUtil;

 /**

  * Servlet implementation class MoreDeleteServlet

  */

 @WebServlet("/MoreDeleteServlet")

 public class MoreDeleteServlet extends HttpServlet {

     private static final long serialVersionUID = 1L;

     /**

      * @see HttpServlet#HttpServlet()

      */

     public MoreDeleteServlet() {

         super();

         // TODO Auto-generated constructor stub

     }

     /**

      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

      */

     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         String[] id=request.getParameterValues("c");

         if(id.length>0)

         {

             for(int i=0;i<id.length;i++)

             {

                 //删除的sql语句

                 String sql = "delete from denglu  where id = "+id[i]+"";

                 try {

                     Statement stam=    DBUtil.getConnection().createStatement();

                     stam.executeUpdate(sql);

                 } catch (SQLException e) {

                     e.printStackTrace();

                 }

             }

         }

         response.sendRedirect(request.getContextPath()+"/pages/student.jsp");

     }

     /**

      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

      */

     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

         // TODO Auto-generated method stub

     }

 }

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