1.创建一个servlet
1 package com.huawei.jiekou;
2
3 import java.io.IOException;
4 import javax.servlet.ServletException;
5 import javax.servlet.annotation.WebServlet;
6 import javax.servlet.http.HttpServlet;
7 import javax.servlet.http.HttpServletRequest;
8 import javax.servlet.http.HttpServletResponse;
9
10 /**
11 * Servlet implementation class TestServlet
12 */
13 @WebServlet(description = "???????servlet", urlPatterns = { "/TestServlet" })
14 public class dengru extends HttpServlet {
15 private static final long serialVersionUID = 1L;
16
17 /**
18 * @see HttpServlet#HttpServlet()
19 */
20 public dengru() {
21 super();
22 // TODO Auto-generated constructor stub
23 }
24
25 /**
26 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
27 */
28 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
29 // TODO Auto-generated method stub
30 String name = request.getParameter("name");
31 String sex = request.getParameter("sex");
32 String age = request.getParameter("age");
33 String str = "{\"name\":\"" + name + "\",\"sex\":\"" + sex + "\",\"age\":" + age + "}";
34 response.getWriter().write(str);
35 // response.getWriter().append("Served at: ").append(request.getContextPath());
36 }
37
38 /**
39 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
40 */
41 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
42 // TODO Auto-generated method stub
43 // doGet(request, response);
44 String account = request.getParameter("account");
45 String psd = request.getParameter("psd");
46 if(account.equals("admin") && psd.equals("123456")) {
47 request.getRequestDispatcher("test1.jsp").forward(request, response);
48 }else if(account.equals("admin") && !psd.equals("123456")) {
49 request.setAttribute("psdErrorString", "password is error");
50 request.getRequestDispatcher("test.jsp").forward(request, response);
51 }else if(!account.equals("admin") && psd.equals("123456")) {
52 request.setAttribute("accountErrorString", "account is error");
53 request.getRequestDispatcher("test.jsp").forward(request, response);
54 }else {
55 request.setAttribute("errorString", "login error");
56 request.getRequestDispatcher("test.jsp").forward(request, response);
57 }
58 }
59
60 }
创建jsp
1 <%@ page language="java" contentType="text/html; charset=utf-8"
2 pageEncoding="utf-8"%>
3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
4 <html>
5 <head>
6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
7 <title>Insert title here</title>
8 </head>
9 <body>
10 <form action="TestServlet" method="post">
11 账号:<input type="text" name="account" />${accountErrorString }<br>
12 密码:<input type="password" name="psd" />${psdErrorString }<br>
13 <input type="submit" value="提交" /><br>${errorString }
14 </form>
15
16 </body>
17 </html>
1 <%@ page language="java" contentType="text/html; charset=utf-8" 2 pageEncoding="utf-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 7 <title>Insert title here</title> 8 </head> 9 <body> 10 <h1>登录成功</h1> 11 </body> 12 </html>
原文地址：https://www.cnblogs.com/ZHANG576433951/p/12342039.html
时间： 2024-07-30 23:03:38