（1）登錄頁面
<!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>用戶登錄</title>
</head>
<body>
<form action="login.do">
126郵箱登錄<br/><br/>
用戶名：<input type="test" name="username"><br/>
密碼：<input type="test" name="password"><br/>
<select name="save Time">
<option value="366">一年</option>
<option value="183">半年</option>
<option value="30">一個月</option>
<option value="7">一週</option>
<option value="1">一天</option>
</select><br/>
<input type="submit" value="登錄">
</form>
</body>
</html>
（2）錯誤頁面
<%@ 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>失敗了</title>
</head>
<body>
Login failure<br/>
</body>
</html>
（3）登錄成功後的頁面
<%@ 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>測試cookie</title>
</head>
<body>
<h2>登錄成功，歡迎${username}的到來126郵箱 </h2><br/>
<h3>測試cookie的功能</h3>
</body>
</html>
（4）Servlet
package com.sky.course;
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.sky.cookie.CheckLogin;
public class LoginServlet extends HttpServlet{
/**
*
*/
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
this.doPost(request,response);
}
public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{
String username=request.getParameter("username");
String password=request.getParameter("password");
String savetime=request.getParameter("save Time");
System.out.println("username"+username+"password"+password);
if(CheckLogin.login(username, password)){//登錄是否成功
if(null!=savetime){
int saveTime=Integer.parseInt(savetime);
int seconds=saveTime*24*60*60;
Cookie cookie=new Cookie("user",username+"=="+password);
// cookie.setMaxAge(10*60*60);//最大過期時間
cookie.setMaxAge(seconds);
response.addCookie(cookie);
}
request.setAttribute(username, username);
request.getRequestDispatcher("/main126.jsp").forward(request, response);
}else{
request.getRequestDispatcher("/failure.jsp").forward(request, response);
}
}
}
（5）CheckLogin
package com.sky.cookie;
public class CheckLogin {
public static boolean login(String username,String password){
if("admin".equals(username)&&"123456".equals(password)){
return true;
}else{
return false;
}
}
}
（6）IndexFilter
package com.sky.course;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.sky.cookie.CheckLogin;
public class IndexFilter implements Filter{
public void destroy(){
}
public void doFilter(ServletRequest arg0, ServletResponse arg1,FilterChain arg2) throws IOException, ServletException {
System.out.println("every request pass here!!!");
HttpServletRequest request=(HttpServletRequest)arg0;
HttpServletResponse response=(HttpServletResponse)arg1;
Cookie[] cookies=request.getCookies();
String[] cooks=null;
String username=null;
String password=null;
if(cookies!=null){
for(Cookie coo:cookies){
String aa=coo.getValue();
cooks=aa.split("==");
if(cooks.length==2){
System.out.println(cooks[0]+cooks[1]);
username=cooks[0];
password=cooks[1];
}
}
}
System.out.println("cookie username|"+username);
System.out.println("cookie password|"+password);
if(CheckLogin.login(username, password)){
System.err.println("check successfully cookie data");
request.getSession().setAttribute("username", username);
System.out.println("--------------測試cookie:");
request.getRequestDispatcher("/main126.jsp").forward(request, response);
}else
arg2.doFilter(request, response);
}
public void init(FilterConfig arg0) throws ServletException {
}
}
（7）web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>cookie</display-name>
<filter>
<filter-name>loginFilter</filter-name>
<filter-class>com.sky.course.IndexFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>loginFilter</filter-name>
<url-pattern>/login.html</url-pattern>
</filter-mapping>
<servlet>
<servlet-name>loginServlet</servlet-name>
<servlet-class>com.sky.course.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>loginServlet</servlet-name>
<url-pattern>/login.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>login.html</welcome-file>
</welcome-file-list>
<welcome-file-list>
<welcome-file>main126.jsp</welcome-file>
</welcome-file-list>
</web-app>
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