Java 不同网络上的客户机服务器

您好，我正在电脑上运行客户端，希望连接到另一台连接到其他网络的电脑上的服务器，但当我尝试连接到服务器时，出现以下异常：

    Exception in thread "main" java.net.ConnectException: Connection timed out: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:579)
    at java.net.Socket.connect(Socket.java:528)
    at java.net.Socket.<init>(Socket.java:425)
    at java.net.Socket.<init>(Socket.java:208)
    at social_network.Client.main(Client.java:30)
Java Result: 1

}

在不同网络上运行的服务器代码：

    public class Server {

    public static void main(String[] args) throws IOException, SQLException, ClassNotFoundException
    {

       ServerSocket server = new ServerSocket(4444);
       System.out.println("Waiting for clients to connect...");

       while (true)
       {
          Socket s = server.accept();
          InetAddress clientAddress = s.getInetAddress();
          System.out.println("Incoming connection from: " + clientAddress.getHostName() + "[" + clientAddress.getHostAddress() + "]");
          s.close();
       }
    }
}

---

怎么了？

你能从客户端ping服务器吗？我无法连接，因为异常显示“连接超时”。这意味着我的客户端无法访问服务器。你没有回答我的问题。您需要确保您可以从客户端访问服务器，否则-为什么还要麻烦呢？打开命令提示符/终端窗口并键入

ping-a 151.54.151.121

，然后您可能使用了错误的IP地址，或者有什么东西阻塞/过滤了您的流量。不管怎样，这都不是Java编程的问题。

    public class Server {

    public static void main(String[] args) throws IOException, SQLException, ClassNotFoundException
    {

       ServerSocket server = new ServerSocket(4444);
       System.out.println("Waiting for clients to connect...");

       while (true)
       {
          Socket s = server.accept();
          InetAddress clientAddress = s.getInetAddress();
          System.out.println("Incoming connection from: " + clientAddress.getHostName() + "[" + clientAddress.getHostAddress() + "]");
          s.close();
       }
    }
}