记住用户名（五）

<%@page import="java.net.URLDecoder"%>
<%@page import="com.it.utils.CookieUtil"%>
<%@ 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>
<%
	Cookie cookie = CookieUtil.getCookie("username", request.getCookies());
	String value = URLDecoder.decode(cookie.getValue(),"utf-8");
%>
${requestScope.loginmessage}<br>
<form action="/day9_2/login" method="post">
	username:<input type="text" name="username" value="<%=value%>"><br>
	password:<input type="password" name="password"><br>
	记住用户名：<input type="checkbox" value="ok" name="saveusername"><br>
	<input type="submit">
</form>
</body>
</html>

com.it.utils.Cookie

package com.it.utils;

import javax.servlet.http.Cookie;

public class CookieUtil {
	public static Cookie getCookie(String name, Cookie[] cookies) {
		if(cookies == null && cookies.length == 0) {
			return null;
		} else {
			for(Cookie cookie : cookies) {
				if(name.equals(cookie.getName())) {
					return cookie;
				}
			}
		}
		return null;
	}
}

com.it.servlet.LoginServlet

package com.it.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
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 ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		response.setContentType("text/html;charset=utf-8");
		String username = request.getParameter("username");
		System.out.println(username);
		String password = request.getParameter("password");
		System.out.println(password);
		//如果用户名为张三，密码为123，正确，才保存用户名
		if("张三".equals(username)&&"123".equals(password)) {
			//登录成功，判断其是否已经勾选了保存用户名
			String saveusername = request.getParameter("saveusername");
			if("ok".equals(saveusername)) {
				//勾选了记住用户名
				//将用户名存储到Cookie中
				Cookie cookie = new Cookie("username", URLEncoder.encode(username,"utf-8"));
				cookie.setMaxAge(24*60*60);
				response.addCookie(cookie);
			}
			response.getWriter().write("已经登录");
		}else {
			request.setAttribute("loginmessage", "用户名密码不正确");
			request.getRequestDispatcher("/login.jsp").forward(request, response);
		}
	}

	

	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}

}

记住用户名（五）

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