1：用户登录界面 login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'login.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css">

    -->

  </head>

  <body>

  <center>

  <form name="myform" method="post" action="/webDemo2/LoginServlet"> 

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

       用户密码：<input type="text" name="userpwd"/><br/><br/>

      <input type="submit" value="登录"/>

      <a href="/webDemo2/registerStudent.html">点击注册用户</a>

  </form>

  </center>

  </body>

</html>

login.jsp

1.1：点击登录，表单信息提交到LoginServlet

package com.neusoft.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.SQLException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.neusoft.dao.StudentDAO;

import com.neusoft.dao.StudentPO;

public class LoginServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");

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

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

        StudentDAO sd = new StudentDAO();

        try {

            StudentPO sp=sd.doLogin(username, userpwd);

            if(sp==null){

                response.sendRedirect("/webDemo2/login.jsp");

            }else{

                request.setAttribute("student", sp);

                if(sp.getUserPower()==1)

                    request.getRequestDispatcher("/main.jsp").forward(request, response);

                else if(sp.getUserPower()==0)

                    request.getRequestDispatcher("/user.jsp").forward(request, response);

            }

        } catch (SQLException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        doGet(request, response);

    }

}

LoginServlet

Power为1代表管理员，Power为2代表用户

分别跳转到main.jsp,user.jsp

1.1.1:管理员登录

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@page import="com.neusoft.dao.StudentPO"%>

<%

//java脚本

//写java的代码

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<%

    StudentPO stu=(StudentPO)request.getAttribute("student");

 %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'main.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css">

    -->

  </head>

  <body>

      <!-- java表达式 -->

      当前网站的根目录：<%=path %><BR/>

      当前网站的全目录：<%=basePath %><br/>

       欢迎<%=stu.getUserName() %>登录！！！<BR/>

       <a href="/webDemo2/QueryAllStudent">查看所有人员</a>

  </body>

</html>

main.jsp

跳转到QueryAllAtudent方法中：

package com.neusoft.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.SQLException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.neusoft.dao.StudentDAO;

import com.neusoft.dao.StudentPO;

public class QueryAllStudent extends HttpServlet {

    /**

     * The doGet method of the servlet. <br>

     *

     * This method is called when a form has its tag value method equals to get.

     *

     * @param request the request send by the client to the server

     * @param response the response send by the server to the client

     * @throws ServletException if an error occurred

     * @throws IOException if an error occurred

     */

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        StudentDAO sd = new StudentDAO();

        try {

            List<StudentPO> list=sd.queryAllStudent();

            request.setAttribute("students", list);

            request.getRequestDispatcher("/showStudents.jsp").forward(request, response);

        } catch (SQLException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        doGet(request, response);

    }

}

QueryAllStudent

创建数据库对象，将数据库中信息放到集合中，封装对象，提交到showStudents.jsp中

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@page import="com.neusoft.dao.StudentPO"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<%

    List<StudentPO> list=(List<StudentPO>)request.getAttribute("students");

 %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'showStudents.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css">

    -->

  </head>

  <body>

  <table border="1" bordercolor="red" align="center">

  <tr>

      <th>用户ID</th>

      <th>真实姓名</th>

      <th>用户姓名</th>

      <th>用户年龄</th>

      <th>用户权限</th>

  </tr>

    <%

        for(StudentPO s :list){

    %>

    <tr>

        <td><%=s.getUserId() %></td>

        <td><%=s.getRealName() %>></td>

        <td><%=s.getUserName() %></td>

        <td><%=s.getUserAge() %></td>

        <td><%=s.getUserPower() %></td>

    </tr>

    <%

        }

     %>

     </table>

  </body>

</html>

showStudents

1.1.2：企业员工登录

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@page import="com.neusoft.dao.StudentPO"%>

<%

//java脚本

//写java的代码

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<%

    StudentPO stu=(StudentPO)request.getAttribute("student");

 %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'main.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css">

    -->

  </head>

  <body>

      <!-- java表达式 -->

      当前网站的根目录：<%=path %><BR/>

      当前网站的全目录：<%=basePath %><br/>

       欢迎<%=stu.getUserName() %>登录！！！<BR/>

       <a href="/webDemo2/QueryOnlyOne?userid=<%=stu.getUserId() %>">查看自己信息</a>

  </body>

</html>

user.jsp

向QueryOnlyOne 提交userid 的信息，为了调用StudentDAO下面的public List<StudentPO> queryStudentById(int id)方法，查询出当前登录用户

package com.neusoft.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.SQLException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.neusoft.dao.StudentDAO;

import com.neusoft.dao.StudentPO;

public class QueryOnlyOne extends HttpServlet {

    /**

     * The doGet method of the servlet. <br>

     *

     * This method is called when a form has its tag value method equals to get.

     *

     * @param request the request send by the client to the server

     * @param response the response send by the server to the client

     * @throws ServletException if an error occurred

     * @throws IOException if an error occurred

     */

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        StudentDAO sd = new StudentDAO();

        StudentPO  sp = new StudentPO();

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

        int userid = Integer.parseInt(id);

        try {

                //将对象保存在请求对象中

                List<StudentPO> list=sd.queryStudentById(userid);

                 request.setAttribute("students", list);

                request.getRequestDispatcher("/showStudents.jsp").forward(request, response);

        } catch (SQLException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        doGet(request, response);

    }

}

QueryOnlyOne.java

跳转到showStudents.jsp中

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%@page import="com.neusoft.dao.StudentPO"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<%

    List<StudentPO> list=(List<StudentPO>)request.getAttribute("students");

 %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <base href="<%=basePath%>">

    <title>My JSP 'showStudents.jsp' starting page</title>

    <meta http-equiv="pragma" content="no-cache">

    <meta http-equiv="cache-control" content="no-cache">

    <meta http-equiv="expires" content="0">

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="This is my page">

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css">

    -->

  </head>

  <body>

  <table border="1" bordercolor="red" align="center">

  <tr>

      <th>用户ID</th>

      <th>真实姓名</th>

      <th>用户姓名</th>

      <th>用户年龄</th>

      <th>用户权限</th>

  </tr>

    <%

        for(StudentPO s :list){

    %>

    <tr>

        <td><%=s.getUserId() %></td>

        <td><%=s.getRealName() %>></td>

        <td><%=s.getUserName() %></td>

        <td><%=s.getUserAge() %></td>

        <td><%=s.getUserPower() %></td>

    </tr>

    <%

        }

     %>

     </table>

  </body>

</html>

showStudents

1.2:注册用户

1.2.1registerStudent.html界面

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>registerStudent.html</title>

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

    <meta http-equiv="description" content="this is my page">

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

    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

  </head>

  <body>

  <center>

    <form name="myform" method="post" action="/webDemo2/RegisterServlet">

        用户ID ：  <input type="text" name="userid"><br/>

        用户姓名：<input type="text" name="username"/><br/>

          真实姓名：<input type="text" name="realname"><br/>

        用户密码：<input type="text" name="userpwd"><br/>

        用户年龄：<input type="text" name="userage"><br/>

        <input type="radio" name="power" value="0" checked>员工

        <input type="radio" name="power" value="1" checked="true">管理员<br/>

        <input type="submit" value="注册"/>

    </form>

   </center>

  </body>

</html>

registerStudent.html

1.2.2跳转到RegisterServlet.java中

package com.neusoft.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.SQLException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.neusoft.dao.StudentDAO;

public class RegisterServlet extends HttpServlet{

    /*

     * HttpServlet中有两个方法需要我们自己重写

     * 需要在web.xml文件中进行注册

     */

    @Override

    protected void doPost(HttpServletRequest req, HttpServletResponse resp)

            throws ServletException, IOException {

        req.setCharacterEncoding("utf-8");

        resp.setCharacterEncoding("utf-8");

        //1.接受客户端数据

        //按照客户端调教数据的name-value的形式来提取数据

        String userid=req.getParameter("userid");

        String username = req.getParameter("username");

        String realname=req.getParameter("realname");

        String userpwd=req.getParameter("userpwd");

        String userage=req.getParameter("userage");

        String userpower=req.getParameter("power");

        int id = Integer.parseInt(userid);

        int age = Integer.parseInt(userage);

        int power=Integer.parseInt(userpower);

        //2.使用JDBC，将数据添加到数据库中

        StudentDAO sd = new StudentDAO();

        //3.HttpServletResponse对象

        //将HTML代码以数据流的形式响应给客户端

        //客户端使用IE浏览器来解析响应的HTML数据流

        //获得一个输出流对象

//        PrintWriter out = resp.getWriter();

//

//        out.println("<html>");

//        out.println("<head>");

//        out.println("<meta http-equiv='content-type' content='text/html; charset=UTF-8'>");

//        out.println("</head>");

//        out.println("<body>");

        try {

            int result=sd.add(id,username,userpwd,age,realname,power);

            if(result>0){

                //1.站内跳转,请求转发

                //只能转发网站内部的资源

                //转发的是同一个请求和响应对象

                req.getRequestDispatcher("/login.jsp").forward(req, resp);

                //2.重定向跳转

                //可以请求外部资源

                //由于是客户端重新发起的请求，所以请求和响应对象不是同一个

                //resp.sendRedirect("/webDemo/success.jsp");

                //out.println("添加成功");

            }else{

                //out.println("添加失败");

            }

        } catch (SQLException e) {

            //out.println("添加失败");

        }

    }

    @Override

    protected void doGet(HttpServletRequest req, HttpServletResponse resp)

            throws ServletException, IOException {

        doPost(req, resp);

    }

}

registerServelet.java

注册成功，重新跳回login.jsp

2.1数据库代码

package com.neusoft.dao;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.ArrayList;

import java.util.List;

public class StudentDAO {

    //链接数据库

    public Connection getConnection(){

            Connection conn = null;

            String driverName="com.mysql.jdbc.Driver";

            String connectionString="jdbc:mysql://localhost:3306/test?"+"user=root&password=123456&useUnicode=true&characterEncoding=utf-8";

            try{

                Class.forName(driverName);

                conn=DriverManager.getConnection(connectionString);

                //conn.close();

            }catch(ClassNotFoundException e){

                e.printStackTrace();

            } catch (SQLException e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

            return conn;

    }

    //用户登录

    public StudentPO doLogin(String username,String userpwd) throws SQLException{

        String sql="select * from test where loginname=? and loginpwd=?";

        Connection conn = getConnection();

        PreparedStatement ps = null;  //向数据库中发送数据集

        ResultSet rs = null;          //接受返回的数据集对象

        StudentPO sp = null;          //将传回的行封装为列对象

        try {

            ps=conn.prepareStatement(sql);

            ps.setString(1, username);

            ps.setString(2, userpwd);

            rs = ps.executeQuery();

            //遍历结果集，将数据封装到集合中

            while(rs.next()){

                sp = new StudentPO();

                sp.setUserName(rs.getString("loginname"));/*********/

                sp.setUserPwd(rs.getString("loginpwd"));

                sp.setuserPower(rs.getInt("power"));

                sp.setUserId(rs.getInt("id"));

                sp.setRealName(rs.getString("name"));

            }

        } catch (SQLException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }finally{

            rs.close();

            ps.close();

            conn.close();

        }

        return sp;

    }

    public int executeNonQuery(String sql,Object[]args) throws SQLException{

        Connection conn = getConnection();

        PreparedStatement ps=null;

        int result=0;

        try {

            ps = conn.prepareStatement(sql);

            if(args!=null){

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

                    ps.setObject(i+1, args[i]);

                }

            }

            result=ps.executeUpdate();

        } catch (SQLException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }finally{

            ps.close();

            conn.close();

        }

        return result;

    }

    //用户注册

    public int add(int id,String name,String loginpwd,int userage,String realname,int userpower) throws SQLException{

        String sql="insert into test(id,loginname,loginpwd,age,name,power)"

            +"values(?,?,?,?,?,?)";

        Object[] args={id,name,loginpwd,userage,realname,userpower};

        int result=executeNonQuery(sql, args);

        return result;

    }

    //刷新用户(在哪调用)

    public int update(int id,String name,String loginpwd,int age) throws SQLException{

        String sql="update test set loginname=? ,loginpwd=? ,age=?"

            +" where id=?";

        Object[] args={name,loginpwd,id,age};

        int result = executeNonQuery(sql, args);

        return result;

    }

    //删除用户信息

    public int delete(int id) throws SQLException{

        String sql="delete from test where id="+id;

        int result=executeNonQuery(sql, null);

        return result;

    }

    //封装数据集

    public List<StudentPO> queryAllStudent() throws SQLException{

        String sql="select * from test";

        Connection conn = getConnection();

        PreparedStatement ps = null;

        ResultSet rs = null;

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

        try {

            ps=conn.prepareStatement(sql);

            rs = ps.executeQuery();

            //遍历结果集，将数据封装到集合中

            while(rs.next()){

                int userid=rs.getInt("id");//***********

                int userage=rs.getInt("age");

                int userpower=rs.getInt("power");

                String username = rs.getString("loginname");

                String userpwd = rs.getString("loginpwd");

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

                StudentPO sp = new StudentPO();

                sp.setUserId(userid);

                sp.setUserName(username);

                sp.setRealName(realname);

                sp.setUserPwd(userpwd);

                sp.setUserAge(userage);

                sp.setuserPower(userpower);

                list.add(sp);

            }

        } catch (SQLException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }finally{

            rs.close();

            ps.close();

            conn.close();

        }

        return list;

    }

    //注册检索

    public List<StudentPO> queryStudentById(int id) throws SQLException{

        String sql="select * from test where id="+id;

        Connection conn = getConnection();

        PreparedStatement ps = null;

        ResultSet rs = null;

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

        try {

            ps=conn.prepareStatement(sql);

            rs = ps.executeQuery();

            //遍历结果集，将数据封装到集合中

            while(rs.next()){

                int userid=rs.getInt("id");//**************/

                int userage=rs.getInt("age");

                int userpower=rs.getInt("power");

                String username = rs.getString("loginname");

                String userpwd = rs.getString("loginpwd");

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

                StudentPO sp = new StudentPO();

                sp.setUserId(userid);

                sp.setUserName(username);

                sp.setUserPwd(userpwd);

                sp.setUserAge(userage);

                sp.setRealName(realname);

                sp.setuserPower(userpower);

                list.add(sp);

            }

        } catch (SQLException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }finally{

            rs.close();

            ps.close();

            conn.close();

        }

        return list;

    }

}

StudentDao.java

package com.neusoft.dao;

import java.util.List;

public class StudentPO {

    private int userId;

    private String userName;

    private int userAge;

    private String userPwd;

    private String realName;

    private int userPower;

    public int getUserPower(){

        return userPower;

    }

    public void setuserPower(int userpower) {

        this.userPower = userpower;

    }

    public String getRealName(){

        return realName;

    }

    public void setRealName(String realname) {

        this.realName = realname;

    }

    public String getUserPwd() {

        return userPwd;

    }

    public void setUserPwd(String userpwd) {

        this.userPwd = userpwd;

    }

    public int getUserId() {

        return userId;

    }

    public void setUserId(int userId) {

        this.userId = userId;

    }

    public String getUserName() {

        return userName;

    }

    public void setUserName(String userName) {

        this.userName = userName;

    }

    public int getUserAge() {

        return userAge;

    }

    public void setUserAge(int userAge) {

        this.userAge = userAge;

    }

}

StudentPO.java

3.1配置文件

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5"

    xmlns="http://java.sun.com/xml/ns/javaee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

  <servlet>

      <servlet-name>RegisterServlet</servlet-name>

      <servlet-class>com.neusoft.servlet.RegisterServlet</servlet-class>

  </servlet>

  <servlet>

      <servlet-name>QueryOnlyOne</servlet-name>

      <servlet-class>com.neusoft.servlet.QueryOnlyOne</servlet-class>

  </servlet>

  <servlet>

    <servlet-name>LoginServlet</servlet-name>

    <servlet-class>com.neusoft.servlet.LoginServlet</servlet-class>

  </servlet>

  <servlet>

    <description>This is the description of my J2EE component</description>

    <display-name>This is the display name of my J2EE component</display-name>

    <servlet-name>QueryAllStudent</servlet-name>

    <servlet-class>com.neusoft.servlet.QueryAllStudent</servlet-class>

  </servlet>

  <servlet-mapping>

      <servlet-name>QueryOnlyOne</servlet-name>

      <url-pattern>/QueryOnlyOne</url-pattern>

  </servlet-mapping>

   <servlet-mapping>

      <servlet-name>RegisterServlet</servlet-name>

      <url-pattern>/RegisterServlet</url-pattern>

  </servlet-mapping>

  <servlet-mapping>

    <servlet-name>LoginServlet</servlet-name>

    <url-pattern>/LoginServlet</url-pattern>

  </servlet-mapping>

  <servlet-mapping>

    <servlet-name>QueryAllStudent</servlet-name>

    <url-pattern>/QueryAllStudent</url-pattern>

  </servlet-mapping>

</web-app>

web.xml

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