spring cloud feign实现远程调用服务传输文件

摘要：实践案例包括两个项目，服务提供者项目名，调用服务项目名，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依赖一文件上传服务控制层文件上传控制文件上传文件上传开始文件上传结束，耗时文件上传失败业务层上传文件判

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：

</>复制代码 
        
            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.文件上传服务upload-service
1.控制层

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@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 uploadFileFTP(@RequestPart(value = "file") MultipartFile file,
                                                         @RequestParam("logId") String logId) {
        FtpApiResponse 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

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@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

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@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 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

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@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 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);
        }
     }
}