ajax与java后台交互

创建的java web项目

前端页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
    <script>
       function TestAjax(){
           var xmlHttp;
           if (window.XMLHttpRequest) {
               xmlHttp = new XMLHttpRequest();
               
           } else {
               xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
           }
           xmlHttp.onreadystatechange = function(){
               if (xmlHttp.readyState==4 && xmlHttp.status==200) {
                  document.getElementById("sp").innerHTML = xmlHttp.responseText; 
               }
           }
           
           xmlHttp.open("GET", "TestAjax?name=Ouyang", true);
           xmlHttp.send();
       }
    </script>
  </head>
  
  <body>
    <button onclick="TestAjax()">利用Ajax获取数据</button> <br>
    <span id = "sp"></span>
    
  </body>
</html>

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