Java网络服务器端ServerSocket

import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;

public class BeerServer {
   public static void main(String args[]) throws Exception {
      ServerSocket ssock = new ServerSocket(1234);
      System.out.println("Listening");
      Socket sock = ssock.accept();
      ssock.close();
      PrintStream ps = new PrintStream(sock.getOutputStream());

      for (int i = 10; i >= 0; i--) {
         ps.println(i + " from Java Source and Support.");
      }
      ps.close();
      sock.close();
   }
}