日期:2014-05-17  浏览次数:20644 次

利用session完成登录
jsp代码


<%@ 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>
     <form action="/CS/servlet/LoginServlet" method="post">
    用户:<input type="text" name="username"><br/>
    密码: <input type="password" name="password"/><br/>
       <input type="submit"  value="提交"/><br/>
    </form>

  </body>
</html>

LoginServlet.java


package com.mjrg.login;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class LoginServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletExceptionIOException {
 response.setCharacterEncoding("UTF-8");
         response.setContentType("text/html;charset=UTF-8");
         PrintWriter out=response.getWriter();
         String username=request.getParameter("username");
 String password=request.getParameter("password");
List<User> list=DB.getAll();
for(User user:list){
out.print(list.size()+"....................................");
if(user.getUsername().equals(username)&&user.getPassword().equals(password)){
request.getSession().setAttribute("user", user);