如何用RestTemplate同时传递一个Java对象和基本类型的参数？

我用RestTemplate想两个参数，一个是自己写的Java类，一个是基本类型

请求的Controller

    @RequestMapping("/buy")
    public int buy(@RequestBody GoodsDetail goodsDetail,Integer buyCount){
        goodsDetail.setRemaining(goodsDetail.getRemaining() - buyCount);
        int num = goodsDetailMapper.updateByPrimaryKey(goodsDetail);
        return num;
    }

• 用getForObject：

      Map<String,Object> map = new HashMap<>();
      map.put("goodsDetail",goodsDetail);
      map.put("buyCount",buyCount);
      int num = restTemplate.getForObject("http://localhost:8088/shop-buy/buy?goodsDetail={goodsDetail}&buyCount={buyCount}", int.class, map);
  

  报400 null

• 用postForObject:

        MultiValueMap<String,Object> multiValueMap = new LinkedMultiValueMap<>();
        multiValueMap.add("goodsDetail",goodsDetail);
        multiValueMap.add("buyCount",buyCount);
        int num = restTemplate.postForObject("http://localhost:8088/shop-buy/buy", multiValueMap, int.class);

报415 null

求救，要疯掉了！

@RequestParam 或者将这两个封装到一个实体类

@RequestMapping("/buy/{buyCount}")
    public int buy(@RequestBody GoodsDetail goodsDetail,@PathParam ("buyCount") Integer buyCount){
        goodsDetail.setRemaining(goodsDetail.getRemaining() - buyCount);
        int num = goodsDetailMapper.updateByPrimaryKey(goodsDetail);
        return num;
    }

restTemplate 好像无法既传方法体，又传地址栏。只能传方法体的同时传restfull风格的变量，比如

//无法访问这样的接口
@PostMapping("/hello/")
public R hello(@RequestBody StudentVo vo,  @RequstParam("id") Interge id){
}


//对于这样的接口可以访问
@PostMapping("/hello/{id}")
public R hello(@RequestBody StudentVo vo,  @PathVriable("id") Interge id){
}