java利用Session实现三天免登录

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ page import="javax.servlet.http.Cookie"%>
<%
	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>登录首页</title>
</head>

<body>
	<%
		String[] up = {};

		//获取所有的cookie信息
		Cookie[] cookies = request.getCookies();

		//遍历cookies
		if (cookies != null) {
			for (Cookie cookie : cookies) {
				if (cookie.getName().equals("userInfo")) {
					String ui = cookie.getValue(); //zhangsan:123
					up = ui.split(":");
				}
			}
		}
	%>


	<form action="login.action" method="post">
		<%
			if (up != null && up.length > 0) {//记住密码
		%>
		<p>
			<label for="uname">用户名：</label><input type="text" name="uname"
				id="uname" value="<%=up[0]%>" />
		</p>
		<p>
			<label for="pwd">密 码：</label><input type="text" name="pwd"
				id="pwd" value="<%=up[1]%>" />
		</p>
		<%
			} else {//没有记住密码
		%>

		<p>
			<label for="uname">用户名：</label><input type="text" name="uname"
				id="uname" />
		</p>
		<p>
			<label for="pwd">密 码：</label><input type="text" name="pwd"
				id="pwd" />
		</p>
		<%
			}
		%>
		<p>
			<input type="submit" value="登 录" />
		</p>


	</form>
	<%
		String error = (String) session.getAttribute("errorInfo");
		if (error != null) {
			out.println(error);
		}
	%>
</body>
</html>

LoginServlet.java

package com.uwo9.controller;

import java.io.IOException;

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

import com.uwo9.entity.User;
import com.uwo9.service.IUserService;
import com.uwo9.service.impl.UserServiceImpl;

public class LoginServlet extends HttpServlet {

	private static final long serialVersionUID = 4296005247016878230L;

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// 设置编码格式
		req.setCharacterEncoding("utf-8");
		resp.setCharacterEncoding("utf-8");
		resp.setContentType("text/html;charset=utf-8");

		// 接收请求参数
		String uname = req.getParameter("uname");
		String pwd = req.getParameter("pwd");

		// 调用Service层相应方法进行处理
		// 创建业务层对象
		IUserService userService = new UserServiceImpl();
		User user = userService.login(uname, pwd);

		// 根据业务层返回值进行响应
		if (user != null) {
			// 判断是否需要记住密码
			String remember = req.getParameter("remember");

			// 判断
			if (remember != null && remember.equals("1")) {// 需要记住密码
				// 将用户名和密码存放在cookie对象中
				Cookie cookie = new Cookie("userInfo", uname + ":" + pwd);
				// 设置有效时间三天
				cookie.setMaxAge(3 * 24 * 60 * 60);
				// 设置有效页面
				cookie.setPath("/uwo9/login.jsp");
				// 将cookie对象存放至response
				resp.addCookie(cookie);

			}else {
				// 将用户名和密码存放在cookie对象中
				Cookie cookie = new Cookie("userInfo", uname + ":" + pwd);
				// 设置
				cookie.setMaxAge(0);
				// 设置有效页面
				cookie.setPath("/uwo9/login.jsp");
				// 将cookie对象存放至response
				resp.addCookie(cookie);
			}

			//将user对象存放至session对象中
			req.getSession().setAttribute("user", user);
			
			// resp.getWriter().print("欢迎" + user.getUsername() + "登录成功！");
			// 请求转发
			req.getRequestDispatcher("success.jsp").forward(req, resp);
		} else {
			// resp.getWriter().print("登录失败！");
			// 设置错误提示信息
			// req.getSession().setAttribute("errorInfo","用户名或密码错误！");
			// 重定向
			resp.sendRedirect("login.jsp");
		}

	}
}

java利用Session实现三天免登录

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