从DatagramPackets调用receive方法时，GUI应用程序黑屏

编程问答 2022-10-27

问题描述

我有一个简单的聊天应用程序，它有两个窗口，一个是客户端，另一个是服务器，目的是通过数据包来回发送消息。但是，初始化后，屏幕将变黑且没有响应。调用DatagramPackets的receive()方法时，似乎发生了错误。我还发现，当我删除EventQueue.invokelater()方法时，应用程序这次没有变成黑屏，但是GUI组件没有正确加载。

public class server {

private JFrame frame;
private JFrame frmServer;
private JTextArea textArea;
private JTextField textField;
private DatagramSocket socket;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokelater(new Runnable() {
        public void run() {
            try {
                server window = new server();
            } catch (Exception e) {
                e.printstacktrace();
            }
        }
    });
}

/**
 * Create the application.
 * @throws IOException 
 */
public server() throws IOException {
    initialize();
}

/**
 * Initialize the contents of the frame.
 * @throws IOException 
 */
private void initialize() throws IOException {
    frmServer = new JFrame();
    frmServer.setVisible(true);
    frmServer.setTitle("Server");
    frmServer.setBounds(100,100,450,300);
    frmServer.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
    frmServer.getContentPane().setLayout(null);
    
    textField = new JTextField();
    textField.setBounds(39,199,260,37);
    frmServer.getContentPane().add(textField);
    textField.setColumns(10);
    
    
    JTextArea textArea = new JTextArea();
    textArea.setBorder(new EtchedBorder(EtchedBorder.LOWERED,null,null));
    textArea.setEditable(false);
    textArea.setBounds(39,11,356,166);
    frmServer.getContentPane().add(textArea);
    
    JButton btnNewButton = new JButton("Send");
    btnNewButton.setBounds(309,86,37);
    frmServer.getContentPane().add(btnNewButton);
    
    backgroundTasks(textField,textArea);
}

private void backgroundTasks(JTextField textField,JTextArea textArea) throws IOException {
    
    socket = new DatagramSocket(2223);
    System.out.println("[Server] Server launched successfully");
    
    //receiving packets from client and sending to client
    
            int bufferValue = 500;
            byte[] buffer = new byte[bufferValue];
            DatagramPacket datagramPacket = new DatagramPacket(buffer,buffer.length);
            
            while(true) {
                socket.receive(datagramPacket);
                
                //this part only executes after client sends packet
                byte[] received = datagramPacket.getData();
                String rc = received.toString();
                
                textArea.setText(rc);
                
            }
            
}}

解决方法

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