使用Cookie保存用户和密码然后自动登录

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>登陆</title>
 6 </head>
 7 <body>
 8 <form method="post" action="Login">
 9     <input type="text" name="user" id="user">
10     <input type="password" name="pwd" id="pwd">
11     <input type="submit" name="登陆" id="bt">
12 </form>
13 <script>
14     var cookie=document.cookie;
15     console.log(cookie)
16     var u=new Array();
17     var user=document.getElementById("user");
18     var pwd=document.getElementById("pwd");
19     var cks=cookie.split(";");
20     for (var i=0;i<cks.length;i++){
21         var kv=cks[i].split("=");
22         //alert(kv[0]);
23         u=kv[1];
24        // alert(kv[1]);
25         if(kv[0].trim()=="user") user.value=kv[1];//去掉前后空格.trim()
26         if(kv[0].trim()=="password") pwd.value=kv[1];//第二次登陆直接把密码填入框中
27         if(user.value!=""&&pwd.value!=""){
28             document.getElementById("bt").click();//模拟点击,直接登陆
29         }
30         for (var j=0;j<kv.length;j++){
31             console.log(kv[1])
32         }
33     }
34     console.log(u)
35 </script>
36 </body>
37 </html>

Servlet的Login.java

 1 package control;
 2 
 3 import javax.servlet.ServletException;
 4 import javax.servlet.annotation.WebServlet;
 5 import javax.servlet.http.*;
 6 import java.io.IOException;
 7 import java.io.PrintWriter;
 8 
 9 @WebServlet("/Login")
10 public class Login extends HttpServlet {
11     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
12         request.setCharacterEncoding("utf-8");
13         response.setContentType("text/html;charset=utf-8");
14         Cookie[] cookie=request.getCookies();
15         for (Cookie c:cookie){
16             System.out.println(c.getName()+"	"+c.getValue());
17         }
18         HttpSession session=request.getSession();
19         String user=request.getParameter("user");
20         String pwd=request.getParameter("pwd");
21         PrintWriter out =response.getWriter();
22         if (user.equals("admin")&& pwd.equals("123")){
23             Cookie u=new Cookie("user","admin");
24             Cookie p=new Cookie("password","123");
25             u.setMaxAge(60*60*24);//设置Cookie生存时长60*60*24一天
26             p.setMaxAge(60*60*24);
27             response.addCookie(u);
28             response.addCookie(p);
29             session.setAttribute("isLogin",true);
30             out.write("成功");
31         }else out.write("失败");
32     }
33 
34     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
35 
36     }
37 }

使用Cookie保存用户和密码然后自动登录

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