这段源代码实现了一个基于Java语言的在线聊天室功能，支持用户实时消息发送与接收，适合用于学习和开发相关项目。
```java
import java.awt.*;
import java.awt.event.*;
import java.net.*;
public class Chat {
Frame f = new Frame(聊天室);
TextField tfIP = new TextField(15);
List lst = new List(6);
DatagramSocket ds;
public Chat() {
try {
ds = new DatagramSocket(3000);
} catch (Exception ex) {
ex.printStackTrace();
}
}
public static void main(String[] args) {
Chat chat = new Chat();
chat.init();
}
public void init() {
f.setSize(300, 300);
f.add(lst);
Panel p = new Panel();
p.setLayout(new BorderLayout());
p.add(West, tfIP);
TextField tfData = new TextField(20);
p.add(East, tfData);
f.add(South, p);
new Thread(() -> {
byte buf[] = new byte[1024];
DatagramPacket dp = new DatagramPacket(buf, 1024);
while (true) {
try {
ds.receive(dp);
lst.add(new String(buf, 0, dp.getLength()) + :from +
dp.getAddress().getHostAddress(), 0);
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
f.setVisible(true);
f.setResizable(false);
// 增加关闭窗口的事件处理代码
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
ds.close();
f.setVisible(false);
f.dispose();
System.exit(0);
}
});
tfData.addActionListener(e -> {
byte[] buf;
try {
buf = e.getActionCommand().getBytes();
DatagramPacket dp = new DatagramPacket(buf, buf.length,
InetAddress.getByName(tfIP.getText()), 3000);
ds.send(dp);
} catch (Exception ex) {
ex.printStackTrace();
}
((TextField) e.getSource()).setText();
});
}
}
```
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