前台传json对象数组，java后台用List接受时报错

Question

spring 项目中的controller是不是不能直接接受对象类型的List为入参？为什么？找了很多相关文档，都说不行，要不就传一个vo类，vo类里面有list，要不就传字符串，后台解析字符串

spring boot 项目：

public class Tag {

int id;



String name;

此处省略了get，set

}

@RestController

public class HelloController {

@RequestMapping(value = "add", consumes = "application/json; charset=utf-8")

public String add(@RequestBody List<Tag> param) {

   System.out.println("param:" + param);

   return "成功";

}

}

commit(){

$.ajax({

    type:"post",

    url: 'add',

    contentType:"application/json; charset=utf-8",

    dataType:"json",

   data:{

       param:JSON.stringify([{id:1,name:'hello'},{id:2,name:'hello'}])

   },

   success:function(data){

       console.log(data);

   }

})

}

后台报错信息：

2018-01-29 13:52:57.856 WARN 3148 --- [nio-8088-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Unrecognized token 'param': was expecting ('true', 'false' or 'null'); nested exception is com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'param': was expecting ('true', 'false' or 'null')

Answer 1

data:JSON.stringify([{id:1,name:'hello'},{id:2,name:'hello'}])