javaappl.txt

JAVA写的聊天程序

import java.awt.*; 
import java.awt.event.*; 
import java.net.*; 

class Chat extends Frame 
{ 
List lst = new List(8); //最多显示六条 
TextField tfIP = new TextField(13); //IP地址输入文本框 
TextField tfData = new TextField(50); //定义输入消息文本框 
DatagramSocket ds = null; 

public Chat() { 
try 
{ 
ds = new DatagramSocket(3000); 
} 
catch (Exception e) 
{ 
e.printStackTrace(); 
} 
this.add(lst,"Center"); //增加列表框 
Panel p = new Panel(); 
this.add(p,"South"); 

p.setLayout(new BorderLayout()); 
p.add(tfIP,"West"); //IP输入 
p.add(tfData,"East"); //消息输入 

new Thread(new Runnable() 
{ 
public void run() 
{ 
byte buf [] =new byte[1024]; 
DatagramPacket dp = new DatagramPacket(buf,1024); 
//显示消息 
while(true) 
{ 
try 
{ 
ds.receive(dp); 
lst.add(new String(buf,0,dp.getLength())+ 
"    -->IP："+dp.getAddress().getHostAddress()+" Port:"+dp.getPort(),0); 
//新消息指定显示在第一行 
//显示格式：消息from ip地址：端口号 
} 
catch (Exception e) 
{ 
if(!ds.isClosed()) 
{ 
e.printStackTrace(); 
} 
} 
} 
} 
}).start(); 

tfData.addActionListener(new ActionListener() 
{ 
public void actionPerformed(ActionEvent e) 
{ 
//取出消息及ip文本框中的内容 
byte [] buf; 
buf =tfData.getText().getBytes(); 
try 
{ 
DatagramPacket dp = new DatagramPacket(buf,buf.length, 
InetAddress.getByName(tfIP.getText()),3000); 
ds.send(dp); 
} 
catch (Exception ex) 
{ 
ex.printStackTrace(); 
} 
//清空 
tfData.setText(""); 
} 
}); 
addWindowListener(new WindowAdapter() 
{ 
public void windowClosing(WindowEvent e) 
{ 
ds.close(); 
dispose(); 
System.exit(0); 
} 
}); 
} 

public static void main(String args[]) 
{ 
System.out.println("Starting Chat……"); 
Chat mainFrame = new Chat(); 
mainFrame.setSize(500,500); 
mainFrame.setTitle("迷你聊天——彭勇"); 
mainFrame.setVisible(true); 
mainFrame.setResizable(false); 
} 
}