SpringMVC怎么获取前台传来的数组

前端请求：
var dataArr = new Array();
for(var i = 0; i < 10; i++){
dataArr.push(i);
}
$.ajax({
url : "test/arrayParam.shtml",
data : {
"datas" : dataArr
},
dataType : "json",
success : function(data) {
alert(data);
},
async : false
});
}
后端代码：
@Controller
@RequestMapping("/test")
public class TestController {

@RequestMapping("/arrayParam")
public @ResponseBody
public int test(@RequestParam(value = "datas[]") long[] datas) {

return datas.length;
}
}