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servlet方式通过Cookie记住登录时的用户名和密码

2015-10-30 18:05 519 查看
1.建立web工程

2.创建存放servlet的包



3右键包，新建servlet，路径将前面的servlet去掉，只需要doPost和doGet方法

编写servlet

CookieServlet.java代码如下：

package test1029;

import java.io.IOException;
import java.io.PrintWriter;

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 CookieServlet extends HttpServlet {

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

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");

String uname=request.getParameter("uname");
String password=request.getParameter("password");
String ck=request.getParameter("ck");

//被选中的状态是on 没有被选中的状态下是null
if("on".equals(ck)){
//构造Cookie对象
//添加到Cookie中
Cookie c=new Cookie("users", uname+"-"+password);

//设置过期时间
c.setMaxAge(600);

//存储
response.addCookie(c);
}
}
}


配置文件web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>test1029</display-name>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>CookieServlet</servlet-name>
<servlet-class>test1029.CookieServlet</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>CookieServlet</servlet-name>
<url-pattern>/CookieServlet</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>


index.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+"/";
%>

<%

//el表达式
String names="";
String pwd="";
//取出Cookie
Cookie [] c=request.getCookies();
for(int i=0;i<c.length;i++){
if(c[i].getName().equals("users")){
//存着数据（用户名+密码）
names=c[i].getValue().split("-")[0];
pwd=c[i].getValue().split("-")[1];

//再一次的存起来（备用）
request.setAttribute("xingming",names);
request.setAttribute("mima", pwd);
}
}

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.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="CookieServlet" method="post">
用户名:<input type="text" name="uname" id="uname" value="${xingming}"/><br>
密码:<input type="password" name="password" id="password" value="${mima }"/><br>
<input type="checkbox" name="ck">记住用户名和密码<br>
<input type="submit" value="登录">
</form>
</body>
</html>


效果图：

1、项目运行之后，先进入登录界面，填写用户名和密码，效果如下图



2.登录后：



3.重新访问登录页面，效果如下：

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