udpsend.java

来自「java制作的UDP通信需要的自己下吧辛苦了啊」· Java 代码 · 共 70 行

import java.net.*;
import java.awt.*;
import java.awt.event.*;
public class UDPSend extends Frame implements ActionListener
{
	TextField TextField1=new TextField();
	Button button1=new Button();
	Button button2=new Button();
	public UDPSend()
	{
		try
		{
			jbInit();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	}
	public void actionPerformed(ActionEvent e)
	{
		Component com=(Component)e.getSource();
		if(com.equals(button1))
			sendData();
		else if(com.equals(button2))
		    System.exit(0);
		else
			sendData();
	}
	void sendData()
	{
		try
		{
			String msg=TextField1.getText();
			if(msg.equals(""))
				return;
			TextField1.setText("");
			InetAddress address=InetAddress.getByName("192.168.18.2");
			int len=msg.length();
			byte[] message=new byte[len];
			msg.getBytes(0,len,message,0);
			DatagramPacket packet=new DatagramPacket(message,len,address,9999);
			DatagramSocket socket=new DatagramSocket();
			socket.send(packet);
		}
		catch(Exception e)
		{
		}	  
	}
    public static void main(String[] args)
    {
    	UDPSend send=new UDPSend();
    	send.setLocation(100,100);
    	send.setSize(200,120);
    	send.show();
    }
    private void jbInit() throws Exception
    {
    	this.setTitle("发送数据报");
    	button1.setLabel("发送");
    	button2.setLabel("退出");
    	//this.setLayout(new FlowLayout());
    	this.add(TextField1,BorderLayout.CENTER);
    	this.add(button1,BorderLayout.NORTH);
    	this.add(button2,BorderLayout.SOUTH);
    	button1.addActionListener(this);
    	button2.addActionListener(this);
    	TextField1.addActionListener(this);	
    }
}