带有json内容和附件的Spring boot swagger multipart

<dependencies>
  ...
  <!-- Swagger依赖 -->
  <dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger2</artifactId>
    <version>2.9.2</version>
  </dependency>
  <dependency>
    <groupId>io.springfox</groupId>
    <artifactId>springfox-swagger-ui</artifactId>
    <version>2.9.2</version>
  </dependency>
  
  <!-- Multipart依赖 -->
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  ...
</dependencies>

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

@SpringBootApplication
@EnableSwagger2
public class Application {
  public static void main(String[] args) {
    SpringApplication.run(Application.class, args);
  }
}

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

@RestController
@RequestMapping("/api")
@Api(tags = "API文档标题")
public class ApiController {

  @PostMapping("/upload")
  @ApiOperation("上传接口")
  public String uploadFile(@RequestParam("file") MultipartFile file, @RequestBody String json) {
    // 处理文件上传和JSON内容
    // ...
    return "上传成功";
  }
}