Java如何使服务器允许连接到套接字端口？

在Java编程中，如何使服务器允许连接到套接字端口？

以下示例显示如何使服务器通过使用ServerSocket类的server.accept()方法和Socket类的sock.getInetAddress()方法来允许连接到套接字端口：`1234。

package com.yiibai;

import java.io.IOException;

import java.net.InetAddress;

import java.net.ServerSocket;

import java.net.Socket;

public class ConnectingSocket {

    public static void main(String[] args) {

      try {

         ServerSocket server = new ServerSocket(12345);

         while (true) {

            System.out.println("Listening");

            Socket sock = server.accept();

            InetAddress addr = sock.getInetAddress();

            System.out.println("Connection made to " + addr.getHostName() + " (" + addr.getHostAddress() + ")");

            pause(5000);

            sock.close();

         }

      } catch (IOException e) {

         System.out.println("Exception detected: " + e);

      }

   }

    private static void pause(int ms) {

        try {

            Thread.sleep(ms);

        } catch (InterruptedException e) {

        }

    }

}

Java

上述代码示例将产生以下结果 -

Listening

Connection made to 127.0.0.1 (127.0.0.1)

Listening

Shell

客户端代码参考如下 -

package com.yiibai;

import java.io.IOException;

import java.net.InetAddress;

import java.net.Socket;

import java.net.SocketException;

import java.net.UnknownHostException;

public class SocketClient {

    public static void main(String[] args) {

        try {

            //InetAddress addr = InetAddress.getByName("127.0.0.1");

            Socket theSocket = new Socket("127.0.0.1", 12345);

            System.out.println("Connected to " + theSocket.getInetAddress() + " on port " + theSocket.getPort()

                    + " from port " + theSocket.getLocalPort() + " of " + theSocket.getLocalAddress());

        } catch (UnknownHostException e) {

            System.err.println("I can't find " + e);

        } catch (SocketException e) {

            System.err.println("Could not connect to " + e);

        } catch (IOException e) {

            System.err.println(e);

        }

    }

}