这一周学会了Springmvc，现在开始尝试加入Ajax，方法如下：

首先要加入jackson jar包，没有的话可以下载我提供的springmvc+mybatis+ajax+taglib的jar包

然后在springmvc配置文件中加入：

<!-- 支持spring3.0新的mvc注解 -->
	<mvc:annotation-driven />
	<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 以及 Ajax请求-->
	<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
		<property name="cacheSeconds" value="0" />
		<property name="messageConverters">
			<list>
				<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>
			</list>
		</property>
	</bean>

<script language="javascript" type="text/javascript">
		function createXMLHttpRequest(){
	    	if(window.XMLHttpRequest){//可以判断浏览器类型
	        	xmlHttp = new XMLHttpRequest();
	      	}
	      	else if(window.ActiveXObject){//如果浏览器支持ActiveX控件
        		xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    		}
		}
		function myajaxtest(){
	      	createXMLHttpRequest();
	      	var url = "myajax/myajax1?uname=测试&a="+Math.random();
	      	if(xmlHttp){
		        xmlHttp.open("GET",url,true);//get方法提交
		        xmlHttp.setRequestHeader("accept","application/json"); //必带的表头
		         //指定回调函数为DBName_callback
		        xmlHttp.onreadystatechange = callback;
		        xmlHttp.send(null);
	      	}
	    }
	    //回调函数
	    function callback(){
	      	if(xmlHttp.readyState ==4){
		        if(xmlHttp.status ==200){
		          	var xmlDoc = xmlHttp.responseText;//取出回传参数
		          	alert(xmlDoc);
		          	if(xmlDoc.replace(/^\s*|\s*$/g,'') == "<span style="font-family: Arial,Helvetica,sans-serif;">ce测试</span><span style="font-family: Arial,sans-serif;">")//去掉空格后才能判断</span>
					{	
						alert("测试成功!");
					}
		        	else{
		          		alert("不能得到描述信息:" + xmlHttp.statusText);
		        	}
		      	}
	    	}
	    }
	</script>

<button type="button" c onclick="myajaxtest();" style="width:100px;">Ajax</button>

package com.wy.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;


@Controller
@RequestMapping("myajax")
public class MyAjaxController {
	
	@RequestMapping(value="/myajax1",method=RequestMethod.GET)//设定只接收get方法
	public @ResponseBody String myajax1(String uname,String a) throws Exception{ 
		uname = new String(uname.getBytes("ISO-8859-1"),"UTF-8");//解决中文乱码
		System.out.println(uname); 
		System.out.println(a); 
		System.out.println("进入Ajax");
		return "ce测试";
	}
}