下面是index.jsp
index.jsp1
<%
@ page language="java" pageEncoding="UTF-8"%>2
<html>3
<head>4
<title>My JSP 'index.jsp' starting page</title>5
<script type="text/javascript" src="ReadXML.js"></script></head>6
<body>7
name <input type="text" id="name"><br>8
age <input type="text" id="age"><br>9
sex <input type="text" id="sex"><br>10
<input type="button" value="SendByGet" onclick="sendByGet()">11
<input type="button" value="SendByPost" onclick="sendByPost()"><br><br>12
<div id="showDiv"></div>13
</body>14
</html>
ReadXML.js1
var xmlHttp;2
3
function createXmlHttpRequest(){4
if(window.XmlHttpRequest){5
xmlHttp = new XmlHttpRequest();6
}else if(window.ActiveXObject){7
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");8
}9
}10
11
function createQueryString(){12
var name = document.getElementById("name").value;13
var age = document.getElementById("age").value;14
var sex = document.getElementById("sex").value;15
var queryString = "name="+name+"&age="+age+"&sex="+sex;16
return queryString;17
}18
19
function sendByGet(){ 20
createXmlHttpRequest();21
var queryString = "message?"+createQueryString()+"&timeStemp="+new Date().getTime();22
xmlHttp.onreadystatechange=handleStateChange;23
xmlHttp.open("GET",queryString,true);24
xmlHttp.send();25
}26
27
function sendByPost(){28
createXmlHttpRequest();29
//在url上加一个当前时间是为了使每次发送的url唯一，防止浏览器缓存。30
var url = "message?timeStemp="+new Date().getTime();31
var queryString=createQueryString();32
xmlHttp.onreadystatechange=handleStateChange;33
xmlHttp.open("POST",url,true);34
xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded;");35
xmlHttp.send(queryString);36
}37
38
function handleStateChange(){39
var showDiv = document.getElementById("show");40
if(xmlHttp.readyState==4){41
if(xmlHttp.status==200){42
var showDiv = document.getElementById("showDiv");43
if(showDiv.hasChildNodes()){44
showDiv.removeChild(showDiv.childNodes[0]);45
} 46
//创建创建textNode47
var responseText = document.createTextNode(xmlHttp.responseText);48
//添加到showDiv元素中49
showDiv.appendChild(responseText);50
}51
}52
}后台servlet
Message.java1
package com.kai;2
3
import java.io.IOException;4
import java.io.PrintWriter;5
6
import javax.servlet.ServletException;7
import javax.servlet.http.HttpServlet;8
import javax.servlet.http.HttpServletRequest;9
import javax.servlet.http.HttpServletResponse;10
11
public class Message extends HttpServlet {12
13
private static final long serialVersionUID = 7196636596362343837L;14
15
public void doGet(HttpServletRequest request, HttpServletResponse response)16
throws ServletException, IOException {17
response.setContentType("text/html");18
PrintWriter out = response.getWriter();19
String name = request.getParameter("name").toString();20
String age = request.getParameter("age").toString();21
String sex = request.getParameter("sex").toString();22
String resText = "you name is "+name+"; age: "+age+"; sex: "+sex;23
out.println(resText);24
out.flush();25
out.close();26
}27
28
public void doPost(HttpServletRequest request, HttpServletResponse response)29
throws ServletException, IOException {30
doGet(request,response);31
}32
33
}
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