java发送post携带MultipartFile文件参数

内部发送POST请求携带文件类型的参数，参考大佬的代码，现在找不到出处了，我写下来方便大家查询以及今后使用，侵删。

public class HttpFileUtil {
    /**
     * 以post方式调用第三方接口,以form-data 形式  发送 MultipartFile 文件数据
     * @param url  post请求url
     * @param fileParamName 文件参数名称
     * @param multipartFile  文件
     */
    public static String doPostFormData(String url, String fileParamName, MultipartFile multipartFile,Map<String, String> paramMap) {
        // 创建Http实例
        CloseableHttpClient httpClient = HttpClients.createDefault();
        // 创建HttpPost实例
        HttpPost httpPost = new HttpPost(url);
        // 请求参数配置
        RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(60000).setConnectTimeout(60000)
                .setConnectionRequestTimeout(10000).build();
        httpPost.setConfig(requestConfig);
        try {
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.setCharset(StandardCharsets.UTF_8);
            builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
            String fileName = multipartFile.getOriginalFilename();
            // 文件流
            builder.addBinaryBody(fileParamName, multipartFile.getInputStream(), ContentType.MULTIPART_FORM_DATA, fileName);
            //表单中其他参数，如果没有其他参数可以注释该部分
            for(Map.Entry<String, String> entry: paramMap.entrySet()) {
                builder.addPart(entry.getKey(),new StringBody(entry.getValue(), ContentType.create("text/plain", Consts.UTF_8)));
            }
            HttpEntity entity = builder.build();
            httpPost.setEntity(entity);
            // 执行提交
            HttpResponse response = httpClient.execute(httpPost);
            if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                // 返回
                String res = EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8);
                return res;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (httpClient != null) {
                try {
                    httpClient.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }
}

接口

    /**
     * 接收图片
     */
    @PostMapping("/acceptImg")
    public String acceptImg(@RequestParam("img") MultipartFile file) throws Exception {
        System.out.println("打印："+file);
        return service.imgSave(file);
    }

调用

HttpFileUtil.doPostFormData(url,"img",mfile);