摘要：實踐案例包括兩個項目，服務提供者項目名，調用服務項目名，主要給出兩個服務之間的調用過程，文件上傳功能不提供項目框架依賴一文件上傳服務控制層文件上傳控制文件上傳文件上傳開始文件上傳結束，耗時文件上傳失敗業務層上傳文件判

實踐案例包括兩個項目，服務提供者項目名：upload-service，調用服務項目名：upload-client，主要給出兩個服務之間的調用過程，文件上傳功能不提供

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

依賴：

        
            io.github.openfeign.form
            feign-form
            3.0.3
        
        
            io.github.openfeign.form
            feign-form-spring
            3.0.3
        
        
            commons-fileupload
            commons-fileupload
            1.3.3
        

一.文件上傳服務upload-service
1.控制層

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

    @Autowired
    private FtpFileService ftpFileService;

    /**
     * FTP文件上傳
     *
     * @return
     */
    @PostMapping(value = "/uploadFile", consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
    public FtpApiResponse uploadFileFTP(@RequestPart(value = "file") MultipartFile file,
                                                         @RequestParam("logId") String logId) {
        FtpApiResponse result = new FtpApiResponse<>();
        LogUtil.updateLogId(logId);
        try {
            log.info("文件上傳開始!}");
            Long startTime = System.currentTimeMillis();
            FtpUploadResDTO resDTO = ftpFileService.uploadFile(file);
            result.setData(resDTO);
            result.setSuccess(true);
            result.setTimeInMillis(System.currentTimeMillis() - startTime);
            log.info("文件上傳結束 resDTO：{}，耗時:{}", 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("文件上傳失敗 Exception：{}", Throwables.getStackTraceAsString(e));
        }
        return result;
    }
}

2.業務層

@Service
@Slf4j
public class FtpFileService {

    @Autowired
    private FtpFileManager ftpFileManager;

    /**
     * 上傳文件
     *
     * @param file
     * @return
     */
    public FtpUploadResDTO uploadFile(MultipartFile file) {
        try {
            //判斷上傳文件是否為空
            if (null == file || file.isEmpty() || file.getSize() == 0) {
                log.info("傳入的文件為空,file:{}", file);
                throw new ServiceException(ErrorMsgEnum.EMPTY_FILE);
            }
            //文件上傳至ftp服務目錄
            FtpFileRecordDO ftpFileRecordDO = ftpFileManager.fileUploadToFtp(file);
            if (null == ftpFileRecordDO) {
                log.info("文件上傳至ftp服務目錄異常");
                throw new ServiceException(ErrorMsgEnum.FILE_UPLOAD_TO_FTP_EXCEPTION);
            }
            return ftpFileManager.addFileRecord(ftpFileRecordDO);
        } catch (Exception e) {
            log.error("業務異常,case", e);
            throw new ServiceException(ErrorMsgEnum.SYSTEM_ERROR);
        }
    }
}

3.服務寫好后，需要把遠程接口暴露出去

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

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

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

}

二.文件上傳客戶端upload-client

@Slf4j
@Component
public class FileManager {
     @Autowired
     private UpDownFtpFacade upDownFtpFacade;
     
     /**
     * 調用遠程上傳文件接口
     *
     * @param file 待上傳的文件
     * @return 下載路徑
     **/
    public FtpApiResponse 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 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);
        }
     }
}