007-java使用socket测试远程服务器的某个端口是否可连接

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;

/**
 * @author zzl
 */
public class PortChecker {

    public static boolean isPortReachable(String host, int port, int timeout) {
        try (Socket socket = new Socket()) {
            socket.connect(new InetSocketAddress(host, port), timeout);
            return true;
        } catch (IOException e) {
            return false;
        }
    }

    public static void main(String[] args) {
        String host = "baidu.com";  // 要 ping 的远程服务器地址
        int port = 80;  // 要 ping 的端口号
        int timeout = 2000;  // 连接超时时间，单位毫秒

        boolean isReachable = isPortReachable(host, port, timeout);
        if (isReachable) {
            System.out.println("Port " + port + " on " + host + " is alive!");
        } else {
            System.out.println("Port " + port + " on " + host + " is dead!");
        }
    }
}