servlet+ajax

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ajax

Servlet Ajax Cache CSS JSP

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servlet代码：

package com.fhqiwcw.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;

/**
 * Servlet implementation class AjaxServlet
 */
public class AjaxServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public AjaxServlet() {
		super();
		// TODO Auto-generated constructor stub
	}

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		response.setContentType("text/xml");
		response.setHeader("Cache-Control", "no-cache");
		PrintWriter out = response.getWriter();
		out.write("<class>");
		out.write("<student>");
		out.write("<name>fhqiwcw</name>");
		out.write("<age>20</age>");
		out.write("</student>");
		out.write("<student>");
		out.write("<name>zhaojun</name>");
		out.write("<age>20</age>");
		out.write("</student>");
		out.write("</class>");
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
	}

}

页面代码：

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%
	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 'MyJsp.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 type="text/javascript">
	var xmlhttp;
	function loadXMLDoc(url) {
		xmlhttp = null;
		if (window.XMLHttpRequest) {// code for Firefox, Opera, IE7, etc.
			xmlhttp = new XMLHttpRequest();
		} else if (window.ActiveXObject) {// code for IE6, IE5
			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		}
		if (xmlhttp != null) {
			xmlhttp.onreadystatechange = state_Change;
			xmlhttp.open("GET", url, true);
			xmlhttp.send(null);
		} else {
			alert("Your browser does not support XMLHTTP.");
		}
	}

	function state_Change() {
		if (xmlhttp.readyState == 4) {// 4 = "loaded"
			if (xmlhttp.status == 200) {// 200 = "OK"
				var xmlRoot = xmlhttp.responseXML;
				document.getElementById('T1').innerHTML = xmlRoot.getElementsByTagName("name")[0].text;
			} else {
				alert("Problem retrieving data:" + xmlhttp.statusText);
			}
		}
	}
</script>
</head>

<body>
<div id="T1"
	style="border: 1px solid black; height: 40; width: 300; padding: 5"></div>
<br />
<button onclick="loadXMLDoc('AjaxServlet')">Click</button>
<a href="AjaxServlet">submit </a>
</body>

</html>

web.xml

  <servlet>
    <description></description>
    <display-name>AjaxServlet</display-name>
    <servlet-name>AjaxServlet</servlet-name>
    <servlet-class>com.fhqiwcw.servlet.AjaxServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>AjaxServlet</servlet-name>
    <url-pattern>/AjaxServlet</url-pattern>
  </servlet-mapping>