udpchatserver.txt

利用UDP进行网络编程,并能读取服务器的时间.

import java.net.*;
import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.Vector;
public class UDPChatServer{
	public static void main(String args[]){
		new ServerAwt();
		
	}		
}
class ServerAwt{
	JFrame frame;
	JPanel panel;
	JTextArea txtArea;
	JScrollPane jsp;
	//Vector vector;
	
	
	DatagramSocket ds;
	DatagramPacket in;
	
	public ServerAwt(){
		
	//	vector=new Vector();
		frame=new JFrame("服务器端");
		panel=new JPanel();
		txtArea=new JTextArea(20,30);
		jsp=new JScrollPane(txtArea);
		frame.add(panel);
		panel.add(jsp);
		frame.setSize(350,400);
		frame.setVisible(true);
		init();
	}
	public void init(){
		try{
				ds=new DatagramSocket(6666);
				byte[]b=new byte[1024];
				in=new DatagramPacket(b,b.length);
			
				ds.receive(in);
				
				byte b1[]=in.getData();
				
				String s=new String(b1,0,b1.length);
				 
				//s=s.toUpperCase();
				InetAddress address=in.getAddress();
				int port=in.getPort();
							
				b=s.toString().getBytes();
				
				DatagramPacket out=new DatagramPacket(b,b.length,address,port);
				
				ds.send(out);
				ds.close();
		/*	while(true){
					
					vector.add(pw);
					Chat c=new Chat(br,vector);
					c.start();
			}*/
		}catch(Exception e){}
	}
	/*	class Chat extends Thread{
			BufferedReader br;
			Vector vector;
		public Chat(BufferedReader br,Vector vector){
			this.br=br;
			this.vector=vector;
		}
		public void run(){
			while(true){
				try{
					String str=br.readLine();
					txtArea.append(str+"\n");
					for(int i=0;i<vector.size();i++){
						PrintWriter pw=(PrintWriter)vector.get(i);
						pw.println(str);	
					}	
				}catch(Exception e){}
			}
		}
	}*/
	
}

/*

public class ServerUDP{

	public static void main(String args[]){
		try{
		DatagramSocket ds=new DatagramSocket(6666);
		byte[]b=new byte[1024];
		 
		DatagramPacket in=new DatagramPacket(b,b.length);
		
		
		
		ds.receive(in);
		
		byte b1[]=in.getData();
		
		String s=new String(b1,0,b1.length);
		 
		s=s.toUpperCase();
		 
		InetAddress address=in.getAddress();
		int port=in.getPort();
		
		//Date d=new Date();
		//b=d.toString().getBytes();
		
		b=s.toString().getBytes();
		
		DatagramPacket out=new DatagramPacket(b,b.length,address,port);
		
		ds.send(out);
		ds.close();
		}catch(Exception e){}
		
	
	}
}*/