HttpClient调用接口发送文件

客户端发送文件：

/**
	 * 文件上传
	 * @param remote_url 请求地址
	 * @param file 请求文件
	 * @return 响应结果
	 */
    public String httpClientUploadFile(String remote_url,File file) {
        CloseableHttpClient httpClient = HttpClients.createDefault();
        String result = "";
        try {
            String fileName = file.getName();
            HttpPost httpPost = new HttpPost(remote_url);
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
　　　　　　　//binFile参数-服务端通过此参数获取文件
            builder.addBinaryBody("binFile", new FileInputStream(file), ContentType.MULTIPART_FORM_DATA, fileName);// 文件流
　　　　　　　//filename-文件名参数
            builder.addTextBody("filename", fileName);
            HttpEntity entity = builder.build();
            httpPost.setEntity(entity);
            HttpResponse response = httpClient.execute(httpPost);// 执行提交
            HttpEntity responseEntity = response.getEntity();
            if (responseEntity != null) {
                // 将响应内容转换为字符串
                result = EntityUtils.toString(responseEntity, Charset.forName("UTF-8"));
            }
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                httpClient.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

　　服务端接收文件：

@RequestMapping(value = "downloadMinimumRateFile",method = RequestMethod.POST)
public ResponseEntity<byte[]> minimumRateFileDownload(HttpServletRequest request){
　　ServletContext context = request.getSession().getServletContext();
   //将当前上下文初始化给  CommonsMultipartResolver （多部分解析器）
   CommonsMultipartResolver resolver = new CommonsMultipartResolver(context);
   //判断是否多文件上传
　　if (resolver.isMultipart(request)) {
        MultipartHttpServletRequest multRequest = (MultipartHttpServletRequest) request;
        MultipartFile rcvFile = multRequest.getFile("binFile");
　　　　 //具体的业务逻辑处理
　　　　　//...
　　　　　//...

　　}
}