1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
2 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
4 <html>
5 <head>
6 <meta http-equiv="pragma" content="no-cache">
7 <meta http-equiv="cache-control" content="no-cache">
8 <meta http-equiv="expires" content="0">
9 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
10 <meta http-equiv="description" content="This is my page">
11 <script type="text/javascript">
12 function createXMLHttpRequest() {
13 try {
14 return new XMLHttpRequest();
15 } catch (e) {
16 try {
17 return ActvieXObject("Msxml2.XMLHTTP");
18 } catch (e) {
19 try {
20 return ActvieXObject("Microsoft.XMLHTTP");
21 } catch (e) {
22 alert("用的是什么浏览器啊？");
23 throw e;
24 }
25 }
26 }
27 }
28 window.onload = function() {
29 var btn = document.getElementById("btn");
30 btn.onclick = function() {
31 var xmlHttp = createXMLHttpRequest();
32 //修改为POST请求方式
33 xmlHttp.open("POST", "<c:url value='/AServlet'/>", true);
34 //POST请求要设置请求头
35 xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
36 //添加参数
37 xmlHttp.send("username=张三&password=123");
38 xmlHttp.onreadystatechange = function() {
39 if(xmlHttp.readyState == 4 && xmlHttp.status == 200) {
40 var text = xmlHttp.responseText;
41 var h1 = document.getElementById("h1");
42 h1.innerHTML = text;
43 }
44 };
45 };
46 };
47 </script>
48 </head>
49 <body>
50 <button id="btn">点击这里</button>
51 <h1 id="h1"></h1>
52 </body>
53 </html>
1 import java.io.IOException;
2 import javax.servlet.ServletException;
3 import javax.servlet.http.HttpServlet;
4 import javax.servlet.http.HttpServletRequest;
5 import javax.servlet.http.HttpServletResponse;
6 public class AServlet extends HttpServlet {
7 public void doPost(HttpServletRequest request, HttpServletResponse response)
8 throws ServletException, IOException {
9 //处理编码问题，防止乱码
10 response.setContentType("text/html;charset=utf-8");
11 request.setCharacterEncoding("UTF-8");
12 String username = request.getParameter("username");//获取请求参数
13 response.getWriter().print(username+"已注册");
14 }
15 }
