Java DatagramSocket UDP服务器Swing调用器不工作
试图创建DatagramSocket UDP服务器/客户端聊天应用程序,但在收到带有DatagramPack的数据包后,在更新GUI时遇到一些问题。这是我的密码;我唯一遗漏的,我认为是无关的,是我的JFrame窗口的grouplayout代码Java DatagramSocket UDP服务器Swing调用器不工作,java,swing,invokelater,Java,Swing,Invokelater,试图创建DatagramSocket UDP服务器/客户端聊天应用程序,但在收到带有DatagramPack的数据包后,在更新GUI时遇到一些问题。这是我的密码;我唯一遗漏的,我认为是无关的,是我的JFrame窗口的grouplayout代码 public class Server extends JFrame { JButton startServerButton; JTextField textField; JTextArea textArea; publ
public class Server extends JFrame {
JButton startServerButton;
JTextField textField;
JTextArea textArea;
public Server() {
super("Server");
initComponents();
setResizable(false);
setVisible(true);
}
private void startServer() throws IOException {
DatagramSocket serverSocket;
String sentence;
startServerButton.setText("Server started");
startServerButton.setEnabled(false);
while (true) {
serverSocket = new DatagramSocket(9876);
// receive
byte[] receiveData = new byte[1024];
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
serverSocket.receive(receivePacket);
sentence = new String(receivePacket.getData());
int port = receivePacket.getPort();
System.out.println("RECEIVED (port " + port + "): " + sentence);
showMessage("RECEIVED (port " + port + "): " + sentence);
InetAddress IPAddress = receivePacket.getAddress();
// send
byte[] sendData = sentence.getBytes();
DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, port);
serverSocket.send(sendPacket);
serverSocket.close();
}
}
private void showMessage(final String text) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
textArea.append("\n" + text);
}
});
}
private void initComponents() {
startServerButton = new JButton();
textField = new JTextField();
textArea = new JTextArea();
textArea.setEditable(false);
startServerButton.setText("Start server");
startServerButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
try {
startServer();
} catch (IOException e) {
e.printStackTrace();
}
}
});
...grouplayout stuff here...
}
public static void main(String args[]) {
Server server = new Server();
}
}
所以问题是,JFrame上的textArea从未更新过,但我的
System.out.println()
始终正确打印从客户端类收到的消息。我可以为我的客户机类显示代码,但我觉得它无关紧要。非常感谢您的帮助,谢谢。您必须在另一个线程中启动套接字侦听器。否则,您将阻止重新绘制
大概是这样的:
startServerButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
Thread t = new Thread(new Runnable() {
public void run() {
try {
startServer();
} catch (IOException e) {
e.printStackTrace();
}
}
});
t.start();
}
});
您必须在另一个线程中启动套接字侦听器。否则,您将阻止重新绘制 大概是这样的:
startServerButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
Thread t = new Thread(new Runnable() {
public void run() {
try {
startServer();
} catch (IOException e) {
e.printStackTrace();
}
}
});
t.start();
}
});
为什么每次在循环中都要创建和关闭套接字?这样肯定会错过消息。为什么每次循环时都要创建和关闭套接字?你肯定会错过这样的信息。现在效果很好,亲爱的!我试图将它放入一个线程中,但是在
startServer()
函数中,而不是在ActionListener
中单击按钮。谢谢现在很好用,甜心!我试图将它放入一个线程中,但是在startServer()
函数中,而不是在ActionListener
中单击按钮。谢谢