使用Okhttp实现上传文件+参数请求接口form-data

    /**
     * 写注释是个好习惯
     *
     * @param mFile
     * @param accountIndex
     * @param exportType
     * @param clear
     * @param email
     * @param dimensions
     * @return
     * @throws IOException
     */
    public String upload(MultipartFile mFile, Integer accountIndex, String exportType,
                         Boolean clear, String email, String dimensions) throws IOException {
        // 这里是MultipartFile转File的过程
        File file = new File(Objects.requireNonNull(mFile.getOriginalFilename()));
        FileUtils.copyInputStreamToFile(mFile.getInputStream(), file);
        // url接口路径
        String url = "http://localhost:8080/upload";
        // file是要上传的文件 File()  这边我上传的是excel，其他类型可以自己改这个parse
        RequestBody fileBody = RequestBody.create(MediaType.parse("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"), file);//这边是把file写进来，也有写路径的，但我这边是写file文件，parse不行的话可以直接改这个"multipart/form-data"
        // 创建OkHttpClient实例,设置超时时间
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .connectTimeout(60L, TimeUnit.SECONDS)
                .writeTimeout(60L, TimeUnit.SECONDS)
                .readTimeout(60L, TimeUnit.SECONDS)
                .build();
        // 不仅可以支持传文件，还可以在传文件的同时，传参数
        MultipartBody requestBody = new MultipartBody.Builder()
                .setType(MultipartBody.FORM) // 设置传参为form-data格式
                .addFormDataPart("account_index", String.valueOf(accountIndex))
                .addFormDataPart("export_type", exportType)
                .addFormDataPart("clear", String.valueOf(clear))
                .addFormDataPart("email", email)
                .addFormDataPart("dimensions", dimensions)
                .addFormDataPart("file", file.getName(), fileBody) // 中间参数为文件名
                .build();

        // 构建request请求体，有需要传请求头自己加
        Request request = new Request.Builder()
                .url(url)
                .post(requestBody)
                .build();
        Response response = null;
        String result = "";
        try {
            // 发送请求
            response = okHttpClient.newCall(request).execute();
            result = response.body().string();
            log.info(url + "发送请求结果:" + result);
            if (!response.isSuccessful()) {
                log.info("请求失败");
                return "请求失败";
            }
            response.body().close();
        } catch (IOException e) {
            log.error(e.getMessage());
        }
        // 会在本地产生临时文件，用完后需要删除
        if (file.exists()) {
            file.delete();
        }
        return result;
    }

(@RequestPart("file") MultipartFile file,
@RequestParam("accountIndex") Integer accountIndex,
@RequestParam("exportType") String exportType,
@RequestParam(value = "clear", required = false) Boolean clear,
@RequestParam("email") String email,
@RequestParam(value = "dimensions", required = false) String dimensions)

(@RequestPart("file") MultipartFile file, RequestVo req)