yomiko.java

一个用java语言写的

import java.net.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
//import java.applet.*;

class Yomiko_Frame extends Frame implements Runnable,ActionListener
{
	TextArea messageArea,sendArea;
	Button b_send;
	InetAddress send_address;
	Box basebox,boxH1,boxH2,boxH3;
	Thread th;

	Yomiko_Frame()
	{
		super("yomiko");
		setSize(800,800);
		setVisible(true);

		messageArea = new TextArea("",10,10,TextArea.SCROLLBARS_VERTICAL_ONLY);
		sendArea = new TextArea("",5,5,TextArea.SCROLLBARS_VERTICAL_ONLY);
		b_send = new Button("send");
		th = new Thread(this);

		messageArea.setEditable(false);
		th.start();

		boxH1 = Box.createHorizontalBox();
		boxH1.add(messageArea);

		boxH2 = Box.createHorizontalBox();
		boxH2.add(sendArea);

		boxH3 = Box.createHorizontalBox();
		boxH3.add(Box.createHorizontalStrut(350));
		boxH3.add(b_send);
		boxH3.add(Box.createHorizontalStrut(350));

		basebox = Box.createVerticalBox();
		basebox.add(boxH1);
		basebox.add(Box.createVerticalStrut(10));
		basebox.add(boxH2);
		basebox.add(Box.createVerticalStrut(10));
		basebox.add(boxH3);

		add(basebox);

		b_send.addActionListener(this);

		addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e)
			{
				System.exit(0);
			}
		});
		validate();
	}
	public void actionPerformed(ActionEvent event)
	{
		byte message[] = sendArea.getText().trim().getBytes();
		try
		{
			send_address = InetAddress.getByName("59.69.120.55");

			DatagramPacket data_pack = new DatagramPacket(message,message.length,send_address,1024);
			DatagramSocket out = new DatagramSocket();

			messageArea.append("发送数据到" + data_pack.getAddress() + "\n");
			messageArea.append("目标端口：" + data_pack.getPort() + "\n");
			messageArea.append("数据包长度：" + data_pack.getLength() + "\n");
			messageArea.append("发送的数据是：" + sendArea.getText().trim() + "\n");

			out.send(data_pack);

			sendArea.setText("");
		}
		catch(Exception e){}
	}
	public void run()
	{
		DatagramPacket pack = null;
		DatagramSocket data = null;

		byte message[] = new byte[8192];
		try
		{
			pack = new DatagramPacket(message,message.length);
			data = new DatagramSocket(3000);
		}
		catch(Exception e){}
		while(true)
		{
			if(data == null) break;
			else
			{
				try
				{
					data.receive(pack);

					int length = pack.getLength();
					InetAddress address = pack.getAddress();
					int port = pack.getPort();
					String mess = new String(pack.getData(),0,length);

					messageArea.append("收到数据长度：" + length + "\n");
					messageArea.append("收到数据包来自："+ address + "  端口" + port + "\n");
					messageArea.append("受到的数据包是：" + mess + "\n");
				}
				catch(Exception e){}
			}
		}
	}
}
public class Yomiko
{
	public static void main(String args[])
	{
		Yomiko_Frame yomiko = new Yomiko_Frame();
		yomiko.pack();
	}
}