CloseableHttpClient 在使用过程中遇到的问题

代码是前辈写的，在对代码进行压测的时候遇到了个问题，最大线程是 不能超过setDefaultMaxPerRoute设置的数字，一点超过 就会死掉。这里会报错 connection pool shut down httpclient

查找过很多博客，查到原因是因为接受到的集合没有释放导致  CloseableHttpClient 一直在被占用。随意可使用的最线程数 就不会超过 之前设置setDefaultMaxPerRoute 数字

 private static CloseableHttpClienthttpClient;

  

  static {

    PoolingHttpClientConnectionManagercm = new PoolingHttpClientConnectionManager();

    cm.setMaxTotal(200);

    cm.setDefaultMaxPerRoute(20);

    cm.setDefaultMaxPerRoute(50);

    httpClient = HttpClients.custom().setConnectionManager(cm).build();

  }

 public static String get(String url) {

    HttpResponse response = null;

    BufferedReaderin = null;

    String result = "";

    try {

  

      HttpGethttpGet = new HttpGet(url);

      response = httpClient.execute(httpGet);

  

      in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

      StringBuffersb = new StringBuffer("");

      String line = "";

      String NL = System.getProperty("line.separator");

      while ((line = in.readLine()) != null) {

        sb.append(line + NL);

      }

      in.close();

      result = sb.toString();

    } catch (IOException e) {

      e.printStackTrace();

    } 

    return result;

  }

  

  public static void main(String[] args) {

    System.out.println(get("https://www.baidu.com/"));

  }

}

这里出现的错误就是 使用接受 httpClient.execute(httpGet); 的返回集合是错误的

应该使用 CloseableHttpResponse 并且需要关闭 接收到的返回结合

 

正确的写法：

 public static String get(String url) {

    CloseableHttpResponse response = null;

    BufferedReaderin = null;

    String result = "";

    try {

  

      HttpGethttpGet = new HttpGet(url);

      response = httpClient.execute(httpGet);

  

      in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));

      StringBuffersb = new StringBuffer("");

      String line = "";

      String NL = System.getProperty("line.separator");

      while ((line = in.readLine()) != null) {

        sb.append(line + NL);

      }

      in.close();

      result = sb.toString();

    } catch (IOException e) {

      e.printStackTrace();

    } 

　　　　finally {

      try {

        if (null != response) response.close();

      } catch (IOException e) {

        e.printStackTrace();

      }

    }

    return result;

  }

    return result;

  }

  

  public static void main(String[] args) {

    System.out.println(get("https://www.baidu.com/"));

  }

}

这样问题就完美解决了