一、实体类

public class UploadModel {
    private Long userId;
    private MultipartFile img1;
    private MultipartFile img2;

    /* getter setter */
}

二、接收

@RestController
public class UploadController {

    @PostMapping("/upload")
    public void upload(UploadModel uploadModel) {

        /* 上传逻辑 */
    }

}

注意事项

1. 接收不需要 @RequestBody 或 @RequestParam 等注解
2. 测试时 Header 需要设置 Content-Type 为 multipart/form-data