关于jquery ajax post 数组到后台spring3 mvc方法

前台页面

	$.ajax({type : "POST",
		   url : "assign.v", 
		   data : {
			   userId : userId,
			   'add[]' : [1,2,3],
			   'del[]' :[4]
		   },
		   success : function (data){
			   searchWidget.searchUser(1);	
	       }
	});

对应spring3 mvc

	@ResponseBody
	@RequestMapping(value="/assign",
	        method=RequestMethod.POST) 
	public String assign(
			@RequestParam(value="userId", required=true) int userId,
			@RequestParam(value="add[]", required=false) int[] add,
			@RequestParam(value="del[]", required=false) int[] del) {
		System.out.println("userId:" + userId);
		System.out.println("add:" + add);
		System.out.println("del:" + del);
		return "";
	}