jsp的session完成登陆功能

jsp的session完成登陆功能

login.jsp:

 1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>

 2 <%

 3 String path = request.getContextPath();

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

 5 %>

 6 

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

 8 <html>

 9   <head>

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

11     

12     <title>用户登录</title>

13     

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

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

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

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

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

19     <!--

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

21     -->

22 

23   </head>

24   

25   <body>

26     <h1>用户登录</h1>

27     <form action="check" method="post">

28         <table border="1" width="250px">

29             <tr><td>用户名:</td><td><input type="text" name="userId" /></td></tr>

30             <tr><td>密码:</td><td><input type="password" name="passwd" /></td></tr>

31             <tr><td></td><td><input type="submit" value="提交" /></td></tr>

32         </table>

33     </form>

34   </body>

35 </html>

welcom.jsp

 1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>

 2 <%

 3 String path = request.getContextPath();

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

 5 %>

 6 

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

 8 <html>

 9   <head>

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

11     

12     <title>My JSP 'welcome.jsp' starting page</title>

13     

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

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

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

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

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

19   </head>

20      <%

21         String user=(String) session.getAttribute("user");

22         if(user==null){

23         %>

24         <jsp:forward page="login.jsp" />

25         <%} %>

26   <body>

27  热烈欢迎您:<%=user %>

28   </body>

29 </html>

web.xml

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

 2 <web-app version="2.5" 

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

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

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

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

 7   <display-name></display-name>    

 8   <welcome-file-list>

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

10   </welcome-file-list>

11   <servlet>

12       <servlet-name>CheckUser</servlet-name>

13       <servlet-class>servlet.CheckUser</servlet-class>

14   </servlet>

15   <servlet-mapping>

16       <servlet-name>CheckUser</servlet-name>

17       <url-pattern>/check</url-pattern>

18   </servlet-mapping>

19   

20 </web-app>

CheckUser.java

 1 package servlet;

 2 

 3 import java.io.IOException;

 4 

 5 import javax.servlet.RequestDispatcher;

 6 import javax.servlet.ServletException;

 7 import javax.servlet.http.HttpServlet;

 8 import javax.servlet.http.HttpServletRequest;

 9 import javax.servlet.http.HttpServletResponse;

10 import javax.servlet.http.HttpSession;

11 

12 public class CheckUser extends HttpServlet {

13     @Override

14     protected void doPost(HttpServletRequest request,

15             HttpServletResponse response) throws ServletException, IOException {

16             request.setCharacterEncoding("UTF-8");

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

18             String passwd=request.getParameter("passwd");

19             

20             if(userId!=null&&passwd!=null&&userId.equals("gys")&&passwd.equals("gys")){

21                 HttpSession session=request.getSession();

22                 session.setAttribute("user", userId);

23                 RequestDispatcher dispatcher=request.getRequestDispatcher("/welcome.jsp");

24                 dispatcher.forward(request, response);

25             }

26             else{

27                 RequestDispatcher dispatcher=request.getRequestDispatcher("/login.jsp");

28                 dispatcher.forward(request, response);

29             }

30     }

31 }

 

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