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 ResponseEntityminimumRateFileDownload(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 = newCommonsMultipartResolver(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

//...

//...

}

}