用ajax做的HelloWorld
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <title>My JSP 'ajax.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"> <script type="text/javascript">function ajaxSubmit(){var xmlHttpRequest = null;//声明一个对象以接受XmlHttpRequest对象if(window.ActiveXObject)//IE浏览器{xmlHttpRequest = new ActiveXObject("Microsoft.XMLHTTP");}else if(window.XMLHttpRequest)//除IE外的其它浏览器{xmlHttpRequest = new XMLHttpRequest();}if(null != xmlHttpRequest){xmlHttpRequest.open("GET","AjaxServlet",true);//关联好ajax的回调函数xmlHttpRequest.onreadystatechange = ajaxCallback;//真正向服务器发送数据xmlHttpRequest.send(null);}function ajaxCallback(){if(xmlHttpRequest.readyState==4){ if(xmlHttpRequest.status==200){ var responseText = xmlHttpRequest.responseText; document.getElementById("div1").innerHTML = responseText; } }}}</script> </head> <body><input type="button" value="返回值" onclick="ajaxSubmit();"><div id="div1"></div> </body></html>?
package com.javasky.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class AjaxServlet extends HttpServlet {private static final long serialVersionUID = 1L;public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {PrintWriter out = response.getWriter();System.out.println("doGet invoked!");out.println("Hello World");out.flush();}}?