public static String get(String url) {
    CloseableHttpResponseresponse = null;
    BufferedReader in = null;
    String result = "";
    try {
      CloseableHttpClienthttpclient = HttpClients.createDefault();
      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;
  }

   HttpHosthost = new HttpHost("locahost", 80);
   cm.setMaxPerRoute(new HttpRoute(host), 50);

package com.zhyea.robin;
 
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
public class HttpUtil {
 
  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) {
    CloseableHttpResponseresponse = 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;
  }
 
  public static void main(String[] args) {
    System.out.println(get("https://www.baidu.com/"));
  }
}

package com.zhyea.robin;
 
import org.apache.http.client.fluent.Request;
import java.io.IOException;
 
public class HttpUtil {
 
  public static String get(String url) {
    String result = "";
    try {
      result = Request.Get(url)
          .connectTimeout(1000)
          .socketTimeout(1000)
          .execute().returnContent().asString();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return result;
  }
 
  public static void main(String[] args) {
    System.out.println(get("https://www.baidu.com/"));
  }
}

<dependency>
   <groupId>org.apache.httpcomponents</groupId>
   <artifactId>fluent-hc</artifactId>
   <version>4.5.2</version>
</dependency>

    CONNMGR = new PoolingHttpClientConnectionManager(sfr);
    CONNMGR.setDefaultMaxPerRoute(100);
    CONNMGR.setMaxTotal(200);

Executor.newInstance().execute(Request.Get(url))
        .returnContent().asString();