<%@ 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 'ajax_test.jsp' starting page</title>
<script type="text/javascript">
function doAjax() {
//1 创建对象
var xhr = new XMLHttpRequest();
//4.接收数据
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
document.getElementById("mydiv").innerHTML = xhr.responseText;
} else {
document.getElementById("mydiv").innerHTML = "<img src='739.gif'>";
}
}
//2.创建请求
xhr.open("get", "hi", true);
//3.发送请求
xhr.send(null);
}
</script>
</head>
<body>
<button onclick="doAjax()">偷偷点我</button>
<div id="mydiv"></div>
</body>
</html>
servlet代码
package cn.ljs.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class Hiservlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
PrintWriter out = response.getWriter();
out.write("aaa");
System.out.println("成功了");
}
}