Spring Cloud Feign上传文件

需求

通常我们会有这样的需求，一个服务上传文件给另一个服务

服务提供端

  @PostMapping(value = "/uploadFile")
  public String uploadFile(@RequestParam MultipartFile multipartFile){

    System.out.println("文件服务器接收到文件："+multipartFile.getOriginalFilename());
    return "suceess";
  }

服务调用端

pom.xml 添加三个依赖包

        <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>io.github.openfeign.form</groupId>
            <artifactId>feign-form-spring</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>

FeignClient 上传文件接口 consumes = MediaType.MULTIPART_FORM_DATA_VALUE，设置表单编码

@FeignClient("server")
public interface UploadFileClient {

  /**
   * test
   * @return
   */
  @RequestMapping(value = "/test")
  String test();

  /**
   * 文件上传
   * @param multipartFile
   * @return
   */
  @RequestMapping(value = "/uploadFile",consumes = MediaType.MULTIPART_FORM_DATA_VALUE,method = RequestMethod.POST)
  String uploadFile(@RequestPart MultipartFile multipartFile);

  @Configuration
  class FeignMultipartSupportConfig {

    @Bean
    public Encoder feignFormEncoder() {
      return new SpringFormEncoder();
    }
  }
}

文件上传, 如果是File，则 转 MultipartFile 然后上传：

    File file = new File(fileName);
    DiskFileItem fileItem = (DiskFileItem) new DiskFileItemFactory().createItem("file",
            MediaType.TEXT_PLAIN_VALUE, true, file.getName());

    try (InputStream input = new FileInputStream(file); OutputStream os = fileItem.getOutputStream()) {
      IOUtils.copy(input, os);
    } catch (Exception e) {
      throw new IllegalArgumentException("Invalid file: " + e, e);
    }

    MultipartFile multipartFile = new CommonsMultipartFile(fileItem);
    uploadFileClient.uploadFile(multipartFile);