daytimeserver.java

一个JAVA小程序！功能不小！

import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.net.ServerSocket;
import java.util.Date;

public class DayTimeServer {

  public static void main(String args[]) {

    int dayTimePort = 13;

    if (args.length == 1) {
      try {
        dayTimePort = Integer.parseInt(args[0]);
      }
      catch (NumberFormatException e) {
        System.out.println("invalid port number");
        System.exit(0); 
      }
    }

    ServerSocket serverSocket = null;
    Socket sock;

    DataOutputStream dataout;    

    try {
      serverSocket = new ServerSocket(dayTimePort);
    }
    catch (IOException e) {
      System.out.println(e.getMessage());
      e.printStackTrace();
      System.exit(0);
    }

    while (true) {
      try {
        sock = serverSocket.accept();
        dataout = new DataOutputStream(new BufferedOutputStream
          (sock.getOutputStream()));
        String dateString = new Date().toString();
        dataout.write(dateString.getBytes(),0,dateString.length());
        dataout.flush();
        sock.close();
        }
      catch (IOException e) {
        System.out.println(e.getMessage());
        e.printStackTrace();
      }
    }
  }
}