Springmvc ResponseBody响应json数据实现过程

<!-- 测试异步请求 --> 
<input type="button" value="测试ajax请求json和响应json" id="testJson"/>

<script type="text/javascript"src="${pageContext.request.contextPath}/js/jquery.min.js"></script> 
<script type="text/javascript">
$(function(){
	$("#testJson").click(function(){
    $.ajax({
      type:"post",
      url:"${pageContext.request.contextPath}/testResponseJson",
      contentType:"application/json;charset=utf-8",
      data:JSON.stringify({"id":1,"name":"test","money":999.0}),
      dataType:"json",
      success:function(data){
      	alert(data);
			}
		});
	});
})
</script>

/**
* 响应 json 数据的控制器
* @author 黑马程序员
* @Company http://www.ithiema.com
* @Version 1.0
*/
@Controller("jsonController")
public class JsonController {
  /**
  * 测试响应 json 数据
  */
	@RequestMapping("/testResponseJson")
	public @ResponseBody Account testResponseJson(@RequestBody Account account) {
    System.out.println("异步请求："+account);
    return account; 
	} 
}

<!--处理器适配器 -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
  <property name="messageConverters">
  	<list>
  		<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean>
  	</list>
  </property>
</bean>