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JSP登录页面大小

 1 <%--
 2   Created by IntelliJ IDEA.
 3   User: SuSh1
 4   Date: 2019/9/27
 5   Time: 12:03
 6   To change this template use File | Settings | File Templates.
 7 --%>
 8 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
 9 <html>
10 <head>
11     <title>注册</title>
12 
13     <style>
14         span{
15             color: red;
16         }
17     </style>
18 </head>
19 <body>
20 <form action="doUserLogin.jsp"method="post">
21 
22     账号: <input type="text"name="userName"placeholder="请输入账号"><span>*</span><br/>
23     密码: <input type="password"name="password"placeholder="请输入密码"><span>*</span><br/>
24 
25     <input type="submit"value="登录">
26 </form>
27 <%
28     String info = request.getParameter("info");
29    if(info !=null){
30        out.print(info);
31    }
32     Integer count = (Integer)application.getAttribute("count");
33    if(count==null){
34        //application中还没有count
35        application.setAttribute("count",1);
36    }else {
37        //application已有count
38 
39        application.setAttribute("count",count+1);
40    }
41     Integer icount=(Integer)application.getAttribute("count");
42    out.print("页面已经访问"+icount+"次");
43 
44 %>
45 
46 
47 </body>
48 </html>

客户端userLogin

 1 <%@ page import="java.net.URLEncoder" %><%--
 2   Created by IntelliJ IDEA.
 3   User: SuSh1
 4   Date: 2019/9/27
 5   Time: 12:04
 6   To change this template use File | Settings | File Templates.
 7 --%>
 8 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
 9 <html>
10 <head>
11     <title>验证注册</title>
12 </head>
13 <body>
14 <%
15     request.setCharacterEncoding("UTF-8");
16     String userName = request.getParameter("userName");
17     String password = request.getParameter("password");
18 
19     if(userName.equals("admin")&&password.equals("123")){
20         //转发
21         session.setAttribute("userName",userName);
22         Cookie cookie = new Cookie("userName",userName);
23         cookie.setPath("/");
24         response.addCookie(cookie);
25         request.getRequestDispatcher("LoginSuccess.jsp").forward(request,response);
26 
27     }else{
28         //重定向
29         String info = "登录失败！";
30         info = URLEncoder.encode(info,"utf-8");
31         response.sendRedirect("userLogin.jsp?info="+info);
32     }
33 %>
34 <%
35 
36 
37 %>
38 </body>
39 </html>

服务器端doUserLogin

 1 <%--
 2   Created by IntelliJ IDEA.
 3   User: SuSh1
 4   Date: 2019/9/28
 5   Time: 18:09
 6   To change this template use File | Settings | File Templates.
 7 --%>
 8 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
 9 <html>
10 <head>
11     <title>Title</title>
12 </head>
13 <body>
14 <%
15     String userName = (String) session.getAttribute("userName");
16     if(userName==null&&userName==""){
17         response.sendRedirect("userLogin.jsp");
18     }else{
19         %>
20        <h1>欢迎<%=userName%>登录成功</h1>
21     <%}
22 
23 %>
24 
25 </body>
26 </html>

登录成功界面

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原文地址：https://www.cnblogs.com/lev1/p/11605334.html