业务场景：判断socket server在否在线，在线返回true,不在线返回false

package com.thinkgem.wlw.modules.test.socketdemo;import java.io.IOException;import java.net.InetSocketAddress;import java.net.Socket;import java.net.SocketAddress;import java.net.SocketTimeoutException;import java.net.UnknownHostException;/** * @Author zhouhe * @Date 2019/10/18 14:24 */public class SocketUtils {  /**   * 判断某服务能否连通   *   * @param host host   * @param port port   * @return boolean   */  public static boolean isRunning(String host, int port) {    Socket sClient = null;    try {      SocketAddress saAdd = new InetSocketAddress(host.trim(), port);      sClient = new Socket();      sClient.connect(saAdd, 3000);  //设置超时 3s    }    catch (UnknownHostException e) {      return false;    }    catch (SocketTimeoutException e) {      return false;    }    catch (IOException e) {      return false;    }    catch (Exception e) {      return false;    }    finally {      try {        if (sClient != null) {          sClient.close();        }      }      catch (Exception e) {      }    }    return true;  }}