[网络协议]org.apache.http.client.ClientProtocolException: null java.io.IOException: Attempted read from close

在写HTTPClient请求的时候，明明请求成功了，但是不知道为什么报错

    /**
     *
     * @param file  文件
     * @param url    请求到哪里url  http://127.0.0.1:8080/upload
     * @param target  上传到哪里  e:/test/
     * @return
     * @throws IOException
     */
    @PostMapping("/test")
    @ResponseBody
    private String gettesthttpclient1(MultipartFile file,String url,String target) throws IOException {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        RequestConfig requestConfig = RequestConfig.custom()
                .setConnectionRequestTimeout(10000)
                .setConnectTimeout(5000)
                .build();
        HttpPost httpPost = new HttpPost(url);
        MultipartEntityBuilder entityBuilder = MultipartEntityBuilder.create();
        // 解决中文文件名乱码问题
        entityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
        entityBuilder.setCharset(Consts.UTF_8);
        InputStream inputStream = file.getInputStream();
        //设置文件
        entityBuilder.addBinaryBody("file", inputStream, ContentType.DEFAULT_BINARY, file.getOriginalFilename());
        //设置参数
        entityBuilder.addTextBody("target", target, ContentType.create("text/plain", Charset.forName("UTF-8")));

        httpPost.setEntity(entityBuilder.build());
        httpPost.setConfig(requestConfig);
        HttpResponse httpResponse = httpclient.execute(httpPost);
        String flag = EntityUtils.toString(httpResponse.getEntity());
        System.out.println(EntityUtils.toString(httpResponse.getEntity()));
        return flag;
    }

原因分析：

 HttpResponse httpResponse = httpclient.execute(httpPost);
        String flag = EntityUtils.toString(httpResponse.getEntity());
        System.out.println(EntityUtils.toString(httpResponse.getEntity()));
        return flag;
        
EntityUtils.toString(httpResponse.getEntity())方法中操作的是流数据，流数据是一次性数据所以同一个HttpEntity不能使用多次该方法.

 return EntityUtils.toString(httpclient.execute(httpPost).getEntity());改成一行就解决了