使用HttpClient出现java.io.IOException: Attempted read from closed stream

问题描述：

使用httpClient时候，出现java.io.IOException: Attempted read from closed stream.

原始代码：

     public static String postJosn(String url, String jsonString) throws Exception {

         SSLContext sslContext = SSLContexts.custom().useTLS().build();
         SSLConnectionSocketFactory f = new SSLConnectionSocketFactory(sslContext, new String[] { "TLSv1.2" }, null,
                 null);
         CloseableHttpClient client = HttpClients.custom().setSSLSocketFactory(f).build();
         // 设置请求超时时间 15秒
         //client.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 15000);
         HttpPost myPost = new HttpPost(url);
         myPost.setHeader(HTTP.CONTENT_TYPE, "application/json;charset=utf-8");
         myPost.setHeader("charset", "utf-8");

         StringEntity s = new StringEntity(jsonString, "utf-8");
         s.setContentEncoding("UTF-8");
         s.setContentType("application/json;charset=utf-8");
         myPost.addHeader("Content-Type", "application/json;charset=utf-8");
         myPost.setEntity(s);

         HttpResponse res = client.execute(myPost);
         HttpEntity entity = res.getEntity();
         //myPost.releaseConnection();
         log.info(EntityUtils.toString(entity, "utf-8"));;
         return EntityUtils.toString(entity, "utf-8");
     }

原因分析：

EntityUtils.toString(HttpEntity entity, String defaultCharset)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.

源码：