spring cloud Feign实现文件传输/上传

今天在实现后台上传功能时，在feign传输文件时一直出问题，故此记录下实现过程，需特别注意标红代码地方。

此功能实现后台代码分为服务端、客户端：

　　前台页面调用客户端接口，客户端再调用服务端接口

1.服务端FileController接口：

@RequestMapping(value = "/uploadImageSingle", method = RequestMethod.POST)
    public BaseDataResp uploadImage(@RequestParam(value = "file") MultipartFile file) {
        BaseDataResp resp = new BaseDataResp();
        try {
            if(file.isEmpty()){
                return BaseDataResp.fail(IGowResultCode.Commons.ERROR_PARAMETER);
            }
            ArrayList<StorePath> list = new ArrayList();
            Set<MetaData> metaDataSet = new HashSet();
            StorePath storePath = this.client.uploadImage(new FastImageFile(file.getInputStream(), file.getSize(), FileUtil.getSuffix(file.getOriginalFilename()), metaDataSet));
            resp.setData(storePath);
        } catch (Exception e) {
            ExceptionLogUtil.debugOrError(log, e, e.getMessage() + e.getMessage());
        }
        resp.setCode(IGowResultCode.Commons.SUCCESS);
        return resp;
    }

2.客户端接口主要实现代码：

private TSystemFiles uploadFile(CommonsMultipartFile file) throws Exception {
　　// 需对传进来的File进行转换，直接传参会报400异常

　　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);

        // 上传文件
    BaseDataResp resp = fileClient.uploadFile(multi);

　　if(!IGowResultCode.Commons.SUCCESS.equals(resp.getCode())){
   　　throw new UserException(IGowResultCode.Commons.ERROR_UNKNOWN);
　　}

｝

FileClient:

@PostMapping(value = "/file/server/uploadImageSingle", consumes = {MediaType.MULTIPART_FORM_DATA_VALUE} , produces = {MediaType.APPLICATION_JSON_UTF8_VALUE})
    BaseDataResp uploadFile(@RequestPart(value = "file",required = false) MultipartFile file);

WebConfig:

@Bean
    public Encoder multipartFormEncoder() {
        return new SpringFormEncoder(new SpringEncoder(new ObjectFactory<HttpMessageConverters>() {
            @Override
            public HttpMessageConverters getObject() throws BeansException {
                return new HttpMessageConverters(new RestTemplate().getMessageConverters());
            }
        }));
    }

maven jar 引用：

<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>
　　　　　　
        </dependency>