1.getAndPostExample.html的代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Sending Request Data Using GET and POST</title>
<script type="text/javascript">
var xmlHttp;
function createXMLHttpRequest() {
if (window.ActiveXObject) {
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
else if (window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
}
}
function createqueryString() {
var firstName = document.getElementById("firstName").value;
var middleName = document.getElementById("middleName").value;
var birthday = document.getElementById("birthday").value;
var queryString = "firstName=" + firstName + "&middleName=" + middleName
+ "&birthday=" + birthday;
return queryString;
}
function doRequestUsingGET() {
createXMLHttpRequest();
var queryString = "GetAndPostExample?";
queryString = queryString + createqueryString()
+ "&timeStamp=" + new Date().getTime();
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.open("GET",queryString,true);
xmlHttp.send(null);
}
function doRequestUsingPOST() {
createXMLHttpRequest();
var url = "GetAndPostExample?timeStamp=" + new Date().getTime();
var queryString = createqueryString();
xmlHttp.open("POST",url,true);
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xmlHttp.send(queryString);
}
function handleStateChange() {
if(xmlHttp.readyState == 4) {
if(xmlHttp.status == 200) {
parseResults();
}
}
}
function parseResults() {
var responseDiv = document.getElementById("serverResponse");
if(responseDiv.hasChildNodes())
{
responseDiv.removeChild(responseDiv.childNodes[0]);
}
var responseText = document.createTextNode(xmlHttp.responseText);
responseDiv.appendChild(responseText);
}
</script>
</head>
<body>
<h1>Enter your first name,middle name,and birthday:</h1>
<table>
<tbody>
<tr>
<td>First name:</td>
<td><input type="text" id="firstName"/>
</tr>
<tr>
<td>Middle name:</td>
<td><input type="text" id="middleName"/>
</tr>
<tr>
<td>Birthday:</td>
<td><input type="text" id="birthday"/>
</tr>
</tbody>
</table>
<form action="#">
<input type="button" value="Send parameters using GET" onclick="doRequestUsingGET();"/>
<br/><br/>
<input type="button" value="Send parameters using POST" onclick="doRequestUsingPOST();"/>
</form>
<br/>
<h2>Server Response:</h2>
<div id="serverResponse"></div>
</body>
</html>
2.GetAndPostExample .java作为服务器端的控制代码：
package com.wch.ajax.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 GetAndPostExample
*/
public class GetAndPostExample extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void processRequest(HttpServletRequest request,HttpServletResponse response,String method) throws Exception
{
response.setContentType("text/html");
String firstName = request.getParameter("firstName");
String middleName = request.getParameter("middleName");
String birthday = request.getParameter("birthday");
String responseText = "Hello"+firstName+" "+middleName+"<br/>"+"your birthday is :"+birthday+"<br/>"+"Method :"+method;
PrintWriter out = response.getWriter();
out.println(responseText);
System.out.println(responseText);
out.close();
}
protected void doGet(HttpServletRequest request,HttpServletResponse response) throws servletexception,IOException {
try {
processRequest(request,response,"Get");
} catch (Exception e) {
// Todo Auto-generated catch block
e.printstacktrace();
}
}
protected void doPost(HttpServletRequest request,"Post");
} catch (Exception e) {
// Todo Auto-generated catch block
e.printstacktrace();
}
}
}
3.web.xml配置 文件：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<display-name>Ajax</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>getAndPostExample</servlet-name>
<servlet-class>com.wch.ajax.servlet.GetAndPostExample</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>getAndPostExample</servlet-name>
<url-pattern>/GetAndPostExample</url-pattern>
</servlet-mapping>
</web-app>
4.运行效果：
需要注意的是：