HttpUtil上传文件

 <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpmime</artifactId>
        <version>4.3.1</version>
    </dependency>

    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.8</version>
    </dependency>    

public void upload(String localFile){//参数为本地文件路径
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        String url = "http://...";//你的服务地址
        try {
            httpClient = HttpClients.createDefault();    			 	
            HttpPost httpPost = new HttpPost(url );
            httpPost.setConfig(RequestConfig.custom().setConnectTimeout(1000).build());
            // 把文件转换成流对象FileBody
            FileBody bin = new FileBody(new File(localFile));


            HttpEntity reqEntity = MultipartEntityBuilder.create()
                    // 相当于<input type="file" name="file"/>
                    .addPart("file", bin)
                    .build();

            httpPost.setEntity(reqEntity);

            // 发起请求 并返回请求的响应
            response = httpClient.execute(httpPost);
            // 获取响应对象
            HttpEntity resEntity = response.getEntity();
            if (resEntity != null) {
                // 打印响应长度
                System.out.println("Response content length: " + resEntity.getContentLength());
                // 打印响应内容
              System.out.println(EntityUtils.toString(resEntity, Charset.forName("UTF-8")));
            }
            // 销毁
            EntityUtils.consume(resEntity);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            try {
                if(response != null){
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

            try {
                if(httpClient != null){
                    httpClient.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }