SpringCloudFeign的文件上传实现的示例代码

@RestController
public class UploadController {

  @PostMapping(value = "/uploadFile", cOnsumes= MediaType.MULTIPART_FORM_DATA_VALUE)
  public String handleFileUpload(@RequestPart(value = "file") MultipartFile file) {
    return file.getName();
  }
  
}

  io.github.openfeign.form
  feign-form
  3.0.3


  io.github.openfeign.form
  feign-form-spring
  3.0.3


  commons-fileupload
  commons-fileupload

@FeignClient(value = "upload-server", cOnfiguration= TestServiceClient.MultipartSupportConfig.class)
public interface UploadService { 
  @PostMapping(value = "/uploadFile", cOnsumes= MediaType.MULTIPART_FORM_DATA_VALUE)
  String handleFileUpload(@RequestPart(value = "file") MultipartFile file);
 
  @Configuration
  class MultipartSupportConfig {
    @Bean
    public Encoder feignFormEncoder() {
      return new SpringFormEncoder();
    }
  } 
}

@Test
@SneakyThrows
public void testHandleFileUpload() { 
  File file = new File("files/aaa.txt");
  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 multi = new CommonsMultipartFile(fileItem); 
  log.info(testServiceClient.handleFileUpload(multi));
}