Java Swing:JFrame在添加新容器后显示为黑色

新用户正在寻求有关大学作业的帮助

任务是创建一个多线程聊天客户端，它可以压缩和加密消息，将消息发送到服务器，然后将相关消息发送给其他人。我已经开始测试代码，但遇到了麻烦。请参阅，当GUI第一次打开时，它将作为登录屏幕打开，并发送到服务器进行验证。接下来应该发生的是登录屏幕应该关闭，并为同一JFrame中的用户打开一个聊天GUI。但我遇到的问题是登录屏幕冻结，窗口的其余部分变黑，如下所示：

然后窗口变得完全没有响应，我必须通过Eclipse的控制台终止线程。这个问题使我无法测试其余的代码。谢谢你的帮助。客户端类的代码如下所示。如果需要更多的代码，请告诉我。谢谢你能提供的任何帮助

如果代码对齐不好，我也要道歉。我还在学习

public class YourChat_Client extends JFrame {
//GUI Components
private JTextField chatField;
private JTextPane broadcastPane;
private Container c; 
private JButton logonButton, btnArken, btnBen, btnDarklark, btnFree, btnSend,btnQuit, btnGroup;
private JPanel logonFieldsPanel, logonButtonPanel;
private JLabel usernameLabel, passwordLabel, chatLbl;
private JTextArea outputArea, playerArea, broadcastArea;
private JTextField username;
private JPasswordField password;
private JTextField broadcastField;
private Boolean loggedOn;
private int participantNo;
//Declare Socket
Socket socket;
YourChat_ClientThread thread;

//Data Streams
ObjectOutputStream clientOutputStream;
ObjectInputStream clientInputStream;
public YourChat_Client() {
    super("YourChat_Client");
    setResizable(false);
    addWindowListener
    (   new WindowAdapter()
    {   public void windowClosing(WindowEvent e)
    {   System.exit(0);
    }
    }
            );
    setTitle("Login");
    setVisible(true);
    setSize(594,243);
    setLocationRelativeTo(null);
    // create and add GUI components for login screen (Taken from practical 7)
    c = getContentPane(); 
    c.setLayout(new BorderLayout());  

    // GUI components for the username
    logonFieldsPanel = new JPanel(); 
    logonFieldsPanel.setLayout(new GridLayout(2,2,5,5));
    usernameLabel = new JLabel("Enter Username: ");
    logonFieldsPanel.add(usernameLabel);
    username = new JTextField(10);
    logonFieldsPanel.add(username);

    // GUI components for the password
    passwordLabel = new JLabel("Enter Password: ");
    logonFieldsPanel.add(passwordLabel);
    password = new JPasswordField(10);
    logonFieldsPanel.add(password);
    c.add(logonFieldsPanel,BorderLayout.CENTER);

    // panel for the logon button
    logonButtonPanel = new JPanel();
    logonButton = new JButton("logon");
    logonButton.addActionListener(new ActionListener(){
        public void actionPerformed(ActionEvent e){
            attemptLogin();
        }   
    });
    logonButtonPanel.add(logonButton);
    c.add(logonButtonPanel, BorderLayout.SOUTH);

    pack();
}
void sendMessage(String message){
    try {
        String output = "m" + message;
        CompressedMessage mess = new CompressedMessage(output);
        clientOutputStream.writeInt(participantNo);
        clientOutputStream.writeObject(mess);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        System.out.println(e);
    }
}
void setUpChat(Boolean loggedOn){

    c.remove(logonButtonPanel);
    c.remove(logonFieldsPanel);

    if(loggedOn){

        setResizable(true);
        setSize(543,243);
        GridBagLayout gridBagLayout = new GridBagLayout();
        gridBagLayout.columnWidths = new int[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
        gridBagLayout.rowHeights = new int[]{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
        gridBagLayout.columnWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, Double.MIN_VALUE};
        gridBagLayout.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
        c.setLayout(gridBagLayout);

        chatLbl = new JLabel(new ImageIcon("chat.png"));
        GridBagConstraints gbc_chatLbl = new GridBagConstraints();
        gbc_chatLbl.gridheight = 2;
        gbc_chatLbl.gridwidth = 3;
        gbc_chatLbl.insets = new Insets(0, 0, 5, 5);
        gbc_chatLbl.gridx = 1;
        gbc_chatLbl.gridy = 1;
        c.add(chatLbl, gbc_chatLbl);

        broadcastPane = new JTextPane();
        GridBagConstraints gbc_broadcastPane = new GridBagConstraints();
        gbc_broadcastPane.insets = new Insets(0, 0, 5, 5);
        gbc_broadcastPane.gridheight = 4;
        gbc_broadcastPane.gridwidth = 6;
        gbc_broadcastPane.fill = GridBagConstraints.BOTH;
        gbc_broadcastPane.gridx = 5;
        gbc_broadcastPane.gridy = 2;
        c.add(broadcastPane, gbc_broadcastPane);

        btnArken = new JButton("Arken");
        GridBagConstraints gbc_btnArken = new GridBagConstraints();
        gbc_btnArken.fill = GridBagConstraints.BOTH;
        gbc_btnArken.insets = new Insets(0, 0, 5, 5);
        gbc_btnArken.gridx = 2;
        gbc_btnArken.gridy = 4;
        c.add(btnArken, gbc_btnArken);

        btnBen = new JButton("Ben");
        GridBagConstraints gbc_btnBen = new GridBagConstraints();
        gbc_btnBen.fill = GridBagConstraints.BOTH;
        gbc_btnBen.insets = new Insets(0, 0, 5, 5);
        gbc_btnBen.gridx = 2;
        gbc_btnBen.gridy = 5;
        c.add(btnBen, gbc_btnBen);

        btnDarklark = new JButton("Darklark");
        GridBagConstraints gbc_btnDarklark = new GridBagConstraints();
        gbc_btnDarklark.fill = GridBagConstraints.BOTH;
        gbc_btnDarklark.insets = new Insets(0, 0, 5, 5);
        gbc_btnDarklark.gridx = 2;
        gbc_btnDarklark.gridy = 6;
        c.add(btnDarklark, gbc_btnDarklark);

        btnFree = new JButton("Free");
        GridBagConstraints gbc_btnFree = new GridBagConstraints();
        gbc_btnFree.fill = GridBagConstraints.BOTH;
        gbc_btnFree.insets = new Insets(0, 0, 5, 5);
        gbc_btnFree.gridx = 2;
        gbc_btnFree.gridy = 7;
        c.add(btnFree, gbc_btnFree);

        chatField = new JTextField();
        GridBagConstraints gbc_chatField = new GridBagConstraints();
        gbc_chatField.insets = new Insets(0, 0, 5, 5);
        gbc_chatField.gridheight = 2;
        gbc_chatField.gridwidth = 6;
        gbc_chatField.fill = GridBagConstraints.BOTH;
        gbc_chatField.gridx = 5;
        gbc_chatField.gridy = 7;
        c.add(chatField, gbc_chatField);
        chatField.setColumns(10);

        btnGroup = new JButton("Group");
        GridBagConstraints gbc_btnGroup = new GridBagConstraints();
        gbc_btnGroup.fill = GridBagConstraints.BOTH;
        gbc_btnGroup.insets = new Insets(0, 0, 5, 5);
        gbc_btnGroup.gridx = 2;
        gbc_btnGroup.gridy = 8;
        c.add(btnGroup, gbc_btnGroup);

        btnQuit = new JButton("Quit");
        GridBagConstraints gbc_btnQuit = new GridBagConstraints();
        gbc_btnQuit.fill = GridBagConstraints.BOTH;
        gbc_btnQuit.gridheight = 2;
        gbc_btnQuit.insets = new Insets(0, 0, 5, 5);
        gbc_btnQuit.gridx = 5;
        gbc_btnQuit.gridy = 9;
        c.add(btnQuit, gbc_btnQuit);

        btnSend = new JButton("Send");
        GridBagConstraints gbc_btnSend = new GridBagConstraints();
        gbc_btnSend.fill = GridBagConstraints.BOTH;
        gbc_btnSend.gridwidth = 3;
        gbc_btnSend.gridheight = 2;
        gbc_btnSend.insets = new Insets(0, 0, 5, 5);
        gbc_btnSend.gridx = 8;
        gbc_btnSend.gridy = 9;
        c.add(btnSend, gbc_btnSend);

        c.revalidate();
        c.repaint();


    } else{

        //if login fails, display an error message, close the data flow streams, and dispose of the window
        JOptionPane.showMessageDialog(null, "Logon unsuccessful. \nConnection Terminated.", "Login Unsuccessful", JOptionPane.WARNING_MESSAGE);
        setEnabled(false);
        closeStreams();
        dispose();
    }
}

void attemptLogin(){
    try {
        //get username from text area and encrypt
        String loginName = username.getText();
        EncryptedMessage uname = new EncryptedMessage(loginName);
        //get password from text area and encrypt
        String loginPword = new String(password.getPassword());
        EncryptedMessage pword = new EncryptedMessage(loginPword);

        uname.encrypt();
        clientOutputStream.writeObject(uname);
        pword.encrypt();
        clientOutputStream.writeObject(pword);

        /* create a new thread of YourChat_ClientThread, sending input  
           stream variable as a parameter */
        thread = new YourChat_ClientThread(clientInputStream);
        thread.run();
    }catch(IOException e){
        System.out.println(e);
        System.exit(1);
    }
} 

void closeStreams()
{   try
{   // close input stream 
    clientOutputStream.close();
    // close output stream 
    clientInputStream.close();
    // close socket 
    socket.close();
}
catch(IOException e) // thrown by method close
{   System.out.println(e);
System.exit(1); 
}
}

void addBroadcast(String s)
{   // add a message to the broadcast text output area
    broadcastArea.append(s + "\n");
    broadcastArea.setCaretPosition(broadcastArea.getText().length());
}

void getConnections() { try
{   // initialise a socket and get a connection to server
    socket = new Socket(InetAddress.getLocalHost(), 6000);
    // get input & output object streams
    clientOutputStream = new ObjectOutputStream(socket.getOutputStream());
    clientInputStream = new ObjectInputStream(socket.getInputStream());

}
catch(UnknownHostException e) // thrown by method getLocalHost
{   System.out.println(e);
System.exit(1); 
}
catch(IOException e) // thrown by methods ObjectOutputStream, ObjectInputStream
{   System.out.println(e);
System.exit(1); 
} 
}

/*
 * -------------------------------------------------------------------------
 * ----------------------YourChat_ClientThread Class------------------------
 * -------------------------------------------------------------------------
 */
public class YourChat_ClientThread{
    ObjectInputStream threadInputStream;

    public YourChat_ClientThread(ObjectInputStream in){
        threadInputStream = in;
    }

    public void run(){
        try{
            Boolean loggedOn = (Boolean)clientInputStream.readObject();
            participantNo = clientInputStream.readInt();

            if(loggedOn){
                CompressedMessage welcome = (CompressedMessage) clientInputStream.readObject();
                welcome.decompress();
                String message = welcome.getMessage();

                setUpChat(loggedOn);

                String inMessage;
                CompressedMessage cMessage;
                while(loggedOn){
                    cMessage = (CompressedMessage)clientInputStream.readObject();
                    cMessage.decompress();
                    inMessage = cMessage.getMessage();

                    //identfier is the first char of the message
                    char identifier = inMessage.charAt(0);
                    //once the char identifier has been taken, the char can be removed from the string
                    inMessage = inMessage.substring(1, inMessage.length());
                    if (identifier == 'q'){
                        addBroadcast(inMessage); 
                    } else if(identifier == 'g'){
                        addBroadcast(inMessage); 
                        closeStreams(); 
                        c.setEnabled(false);

                    } else if(identifier == 'j'){
                        addBroadcast(inMessage);
                        CompressedMessage usernameMessage = (CompressedMessage)clientInputStream.readObject();
                        usernameMessage.decompress();
                        String username = usernameMessage.getMessage();

                        switch (username){
                        case "Arken":   btnArken.setEnabled(true);      break;
                        case "Ben":     btnBen.setEnabled(true);        break;
                        case "Darklark":btnDarklark.setEnabled(true);   break;
                        case "Free":    btnFree.setEnabled(true);       break;
                        }

                    }else if(identifier == 'o'){

                    }

                }
            } else{
                CompressedMessage denied = (CompressedMessage) clientInputStream.readObject();
                denied.decompress();
                String message = denied.getMessage();
                closeStreams();

                JOptionPane.showMessageDialog(null, message, "ERROR", JOptionPane.ERROR_MESSAGE);
                System.exit(1);
            }
        }catch(IOException e1){
            System.out.println(e1);
            System.exit(1);
        }catch(ClassNotFoundException e1){
            System.out.println(e1);
            System.exit(1);

        }
    }

    public void disableWindow(){
        btnBen.setEnabled(false);
        btnArken.setEnabled(false);
        btnDarklark.setEnabled(false);
        btnFree.setEnabled(false);
    }
}

//main method
public static void main(String [] args){
    YourChat_Client client = new YourChat_Client();
    client.getConnections();
}

---

}请阅读Java教程课程：（）

您正在启动一个线程来更新EDT外部的GUI。这可能会导致一些更新和GUI问题。在Swing中，所有GUI更新必须在事件调度线程（EDT）内执行

---

我不确定这是否是您的根本问题，但在检查其他问题之前，您应该清理有关EDT的代码。

请删除代码中不必要的部分，并将重点放在导致问题的部分。请参阅我不再费心修复的问题。不要阻止EDT（事件调度线程）。发生这种情况时，GUI将“冻结”。有关详细信息和修复方法，请参阅。我不知道；我不确定这是问题的原因，但注意到GUI进行了一些服务器调用（可能需要一段时间才能完成），但没有声明任何

SwingWorker

实例。