在jsp页面实现保存登录用户名和密码

loginindex.jsp：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd">
<%@ page language="java" import="java.util.*,java.net.* " pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%
try{
Cookie[] cookies = request.getCookies();
if(cookies != null){
for(int i = 0; i < cookies.length; i++){
if(cookies[i].getName().equals("username")){
String username=URLDecoder.decode(cookies[i].getValue(), "utf-8");
request.setAttribute("username",username);
}
if(cookies[i].getName().equals("password")){
String password= URLDecoder.decode(cookies[i].getValue(), "utf-8");
request.setAttribute("password",password);
}
}
}
}catch(Exception e){
e.printStackTrace();
}
%>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<base href="<%=basePath%>">
<title>My JSP 'loginindex.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="css/info/loginindex.css">
<script type='text/javascript' src='js/jquery-latest.js'></script>
<script type="text/javascript">
function check(){
var murl="<%=request.getContextPath()%>/LoginIndexServlet";
var username=encodeURI(document.getElementById("username").value);
var password=document.getElementById("password").value;
var a1="";
var a2="";
if(document.getElementById("a1").checked){
a1="uname";
}
if(document.getElementById("a2").checked){
a2="upass";
}
$.post(murl,{username:username,password:password,a1:a1,a2:a2} ,function(data){
var json=eval("(" + data + ")");
if(json.result=="success"){
window.location.href="<%=request.getContextPath()%>/info/myinfo.jsp?username="+username;
}else{
window.location.href="<%=request.getContextPath()%>/info/loginindex.jsp";
}
});
}
</script>
</head>
<body>
<div class="head1">
<input class="loc1" type="button" value="返回" οnclick="javascript :history.back(-1);">
<font class="loc2">登录注册</font>
</div>
<div class="logo">
<img src="data:images/headerLogo.png"></img>
</div>
<div class="form1">
<form>
<table align=center>
<tr><td>用户名：</td><td><input type="text" value="${username}" name="username" id="username"/></td><tr>
<tr><td>密　码：</td><td><input type="password" value="${password}" name="password" id="password"/></td><tr>
</table><br/>
<input type=checkbox id='a1' value="a1">保存登录名</input>
<input type=checkbox id='a2' value="a2">保存密码</input><br/><br/><br/>
<input type="button" οnclick="window.location='<%=request.getContextPath()%>/info/register.jsp'" value="快速注册">
<input type="button" value="登　　录" οnclick="check() ">
</form>
</div>
</body>
</html>

LoginIndexServlet：

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.net.URL;
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 LoginIndexServlet 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 {
response.setContentType("text/html;charset=utf-8");
String msource="http://mobile.51bi.com/login.do";
String username=request.getParameter("username");
String password=request.getParameter("password");
String a1=request.getParameter("a1");
String a2=request.getParameter("a2");
if("uname".equals(a1)){
System.out.println("a1不为空");
try{
Cookie cookie1 = new Cookie("username", username);
cookie1.setMaxAge(30 * 60 * 24 * 30 * 2); //用户名保留1个月
response.addCookie(cookie1);
}catch(Exception ex){
ex.printStackTrace();
}
}else{
System.out.println("a1为空");
}
if("upass".equals(a2)){
System.out.println("a2不为空");
try{
Cookie cookie2 = new Cookie("password", URLEncoder.encode(password,"utf-8"));
cookie2.setMaxAge(30 * 60 * 24 * 30 * 2); //用户名保留1个月
response.addCookie(cookie2);
}catch(Exception ex){
ex.printStackTrace();
}
}else{
System.out.println("a2为空");
}
msource=msource+"?username="+username+"&password="+password;
System.out.println(msource);
URL url = new URL(msource);
InputStream is = url.openStream();
byte[] b = new byte[is.available()];
is.read(b);
String resultString=new String(b, "utf-8");
String tempString=new String(resultString.getBytes("iso-8859-1"),"utf-8");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
System.out.println(resultString);
out.print(resultString);
is.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @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 doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}

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