创建简单的ServerSocket服务器
import java.io.IOException;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;

public class SocketDemo {
public static void main ( String [] args ) {
try {
ServerSocket server = new ServerSocket ( 6123 ) ;
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 ) {
}
}
}