spring cloud feign实现远程调用服务传输文件的方法

实践案例包括两个项目，服务提供者项目名：upload-service，调用服务项目名：upload-client，主要给出两个服务之间的调用过程，文件上传功能不提供

项目框架：spring-boot 2.0.1.RELEASE、spring-cloud Finchley.RELEASE

依赖：

  <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>

创建FeignClient接口（用于指定远程调用的服务）

// 申明这是一个Feign客户端，并且指明服务id
@FeignClient(value = "com-spring-caclulate")
public interface CacluFeignClient {

 // 这里定义了类似于SpringMVC用法的方法，就可以进行RESTful的调用了
 @RequestMapping(value = "/caclu/{num}", method = RequestMethod.GET)
 public Item caclulate(@PathVariable("num") Integer num);

}

一.文件上传服务upload-service

1.控制层

@Slf4j
@CrossOrigin
@RestController
@RequestMapping("/ftp")
@Api(description = "文件上传控制")
public class FtpFileController {

 @Autowired
 private FtpFileService ftpFileService;

 /**
  * FTP文件上传
  *
  * @return
  */
 @PostMapping(value = "/uploadFile", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
 public FtpApiResponse<FtpUploadResDTO> uploadFileFTP(@RequestPart(value = "file") MultipartFile file,
               @RequestParam("logId") String logId) {
  FtpApiResponse<FtpUploadResDTO> result = new FtpApiResponse<>();
  LogUtil.updateLogId(logId);
  try {
   log.info("文件上传开始!}");
   Long startTime = System.currentTimeMillis();
   FtpUploadResDTO resDTO = ftpFileService.uploadFile(file);
   result.setData(resDTO);
   result.setSuccess(true);
   result.setTimeInMillis(System.currentTimeMillis() - startTime);
   log.info("文件上传结束 resDTO：{}，耗时:{}", resDTO, (System.currentTimeMillis() - startTime));
  } catch (ServiceException e){
   result.setSuccess(false);
   result.setErrorCode(ErrorMsgEnum.FILE_UPLOAD_EXCEPTION.getCode());
   result.setErrorMsg(ErrorMsgEnum.FILE_UPLOAD_EXCEPTION.getMsg());
  } catch (Exception e) {
   result.setSuccess(false);
   result.setErrorCode(ErrorMsgEnum.SYSTEM_ERROR.getCode());
   result.setErrorMsg(ErrorMsgEnum.SYSTEM_ERROR.getMsg());
   log.info("文件上传失败 Exception：{}", Throwables.getStackTraceAsString(e));
  }
  return result;
 }
}

2.业务层

@Service
@Slf4j
public class FtpFileService {

 @Autowired
 private FtpFileManager ftpFileManager;

 /**
  * 上传文件
  *
  * @param file
  * @return
  */
 public FtpUploadResDTO uploadFile(MultipartFile file) {
  try {
   //判断上传文件是否为空
   if (null == file || file.isEmpty() || file.getSize() == 0) {
    log.info("传入的文件为空,file:{}", file);
    throw new ServiceException(ErrorMsgEnum.EMPTY_FILE);
   }
   //文件上传至ftp服务目录
   FtpFileRecordDO ftpFileRecordDO = ftpFileManager.fileUploadToFtp(file);
   if (null == ftpFileRecordDO) {
    log.info("文件上传至ftp服务目录异常");
    throw new ServiceException(ErrorMsgEnum.FILE_UPLOAD_TO_FTP_EXCEPTION);
   }
   return ftpFileManager.addFileRecord(ftpFileRecordDO);
  } catch (Exception e) {
   log.error("业务异常,case", e);
   throw new ServiceException(ErrorMsgEnum.SYSTEM_ERROR);
  }
 }
}

3.服务写好后，需要把远程接口暴露出去

@FeignClient(value = "upload-service", configuration = UpDownFtpFacade.MultipartSupportConfig.class)
public interface UpDownFtpFacade {

 /**
  * FTP上传文件
  *
  * @param file 文件
  * @param logId 日志id
  * @return
  */
 @PostMapping(value = "/ftp/uploadFile",consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
 FtpApiResponse<FtpUploadResDTO> uploadFileFTP(@RequestPart(value = "file") MultipartFile file,
             @RequestParam("logId") String logId);

 /**
  * 引用配置类MultipartSupportConfig.并且实例化
  */
 @Configuration
 class MultipartSupportConfig {
  @Bean
  public Encoder feignFormEncoder() {
   return new SpringFormEncoder();
  }
 }

}

二.文件上传客户端upload-client

@Slf4j
@Component
public class FileManager {
  @Autowired
  private UpDownFtpFacade upDownFtpFacade;

  /**
  * 调用远程上传文件接口
  *
  * @param file 待上传的文件
  * @return 下载路径
  **/
 public FtpApiResponse<FtpUploadResDTO> requestFtpFacade(MultipartFile file) {
  try {
   DiskFileItem fileItem = (DiskFileItem) new DiskFileItemFactory().createItem("file",
     MediaType.ALL_VALUE, true, file.getOriginalFilename());
   InputStream input = file.getInputStream();
   OutputStream os = fileItem.getOutputStream();
   IOUtils.copy(input, os);
   MultipartFile multi = new CommonsMultipartFile(fileItem);
   FtpApiResponse<FtpUploadResDTO> response = upDownFtpFacade.uploadFileFTP(multi, LogUtil.getLogId());
   if (null == response || !response.getSuccess() || null == response.getData()) {
    throw new ManagerException(ErrorMsgEnum.FIlE_UPLOAD_FAILED);
   }
   return response;
  } catch (Exception e) {
   throw new ManagerException(ErrorMsgEnum.FIlE_UPLOAD_FAILED);
  }
  }
}

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