Java代码如何检测指定ip地址和端口是否能够连通呢?

实现思路:
    使用InetSocketAddress类实例化IP和端口
	然后检测其是否可连通,即可

import java.applet.Applet;
import java.awt.Graphics;
import java.net.InetSocketAddress;
import java.net.Socket;

public class ConnectionTestApplet extends Applet {
    private static boolean portAvailable;
    public void start() {
        int delay = 1000; // 1 s
        try {
            Socket socket = new Socket(); 
			//检测 8.8.8.8 的8848端口是否可达
            socket.connect(new InetSocketAddress("8.8.8.8", 8488), delay);
            portAvailable = socket.isConnected();
            socket.close();
            System.out.println("init() giving--->  " + portAvailable);
        }
        catch (Exception e) {
            portAvailable = false;
            System.out.println("init() giving--->  " + portAvailable);
            System.out.println("Threw error---> " + e.getMessage());
        }

    }
    public void paint(Graphics g) {
        System.out.println("Connection possible---> " + portAvailable);
        String msg = "Connection possible---> " + portAvailable;
        g.drawString(msg, 10, 30);
    }
}