Springmvc处理json数据（如何使用springmvc完成json操作）

<script type="text/javascript" src="${pageContext.request.contextPath }/js/jquery-1.4.4.min.js"></script>
<script type="text/javascript">
$(function(){
	var params = '{"id": 1,"name": "测试商品","price": 99.9,"detail": "测试商品描述","pic": "123456.jpg"}';
	$.ajax({
		url : "${pageContext.request.contextPath }/json.action",
		data : params,
		contentType : "application/json;charset=UTF-8",//发送数据的格式
		type : "post",
		dataType : "json",//回调
		success : function(data){
			alert(data.name);
		}
		
	});
});
</script>