<%@ 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,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"); } }
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