Question

目前我正在编写一个聊天，我注意到每当我在JTextfield中写一些东西而没有将它发送到服务器时，JTextfield的当前内容重置为＆＃34;＆＃34;。在我的代码中，一些字符串部分是德语的，但这不应该是我希望的一个大问题。

首先这是空JTextfield的屏幕截图：然后我在JTextfield中写了一些东西：之后测试文本＆＃34; hg ..＆＃34; 2-4秒后删除而不按任何东西。

public class ClientWindow extends JFrame implements Runnable{
    private static final long serialVersionUID = 7413464033743652908L;

    private JPanel contentPane;

    private JMenuBar bar;
    private JMenu datei;
    private JMenu option;
    private JMenu features;

    private JMenuItem verlaufSpeichern;
    private JMenuItem w;
    private JMenuItem ww;

    private JTextArea history;
    private JTextField text;
    private JButton send;

    private DefaultCaret caret;

    private Client client;

    private Thread run, listen;

    public ClientWindow(String name, String address, int port){
        client = new Client(name,address,port);

        createWindow();
        createPanel();
        createLookAndFeel();
        createJMenu();
        createInhalt();
        console("Versuche zu Verbinden.(Username: "+ name +", IP: "+ address +", Port: "+ port +")");

        boolean connect = client.openConnection(address);

        if(!connect){
            console("Verbindung fehlgeschlagen.");
        }
        String connection = "/c/" + name;
        client.send(connection.getBytes());
        run = new Thread(this,"Running");
        run.start();
    }

    public void run(){
        listen();
    }

    public void listen(){
        listen = new Thread("Listen") {
            public void run(){
                while(true){
                    String message = client.receive();
                    if(message.startsWith("/c/")){
                        client.setID(Integer.parseInt(message.split("/c/|/e/")[1]));
                        console("Erfolgreich verbunden.");
                    } else if(message.startsWith("/m/")){
                        System.out.println(message);
                        String text = message.substring(3);
                        text = text.split("/e/")[0];
                        console(text);
                    } else if(message.startsWith("/i/")){
                        String text = "/i/" + client.getID() + "/e/";
                        send(text, false);
                    }
                }
            }
        };
        listen.start();
    }

    public void createLookAndFeel(){
        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException
                | UnsupportedLookAndFeelException e) {
            e.printStackTrace();
        }
    }

    public void createJMenu(){
        bar = new JMenuBar();
        datei = new JMenu(" Datei ");
        option = new JMenu(" Options ");
        features = new JMenu(" Features ");
        verlaufSpeichern = new JMenuItem(" Verlauf speichern ");
        w = new JMenuItem(" Coming Soon ");
        ww = new JMenuItem(" Coming Soon ");

        datei.add(verlaufSpeichern);
        option.add(w);
        features.add(ww);

        bar.add(datei);
        bar.add(option);
        bar.add(features);

        setJMenuBar(bar);
    }

    public void createWindow(){
        setResizable(false);
        setTitle("Chat - "+ client.getName());
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(800,550);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    public void createPanel(){
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5,5,5,5));
        setContentPane(contentPane);
        contentPane.setLayout(null);
    }

    public void createInhalt(){
        history = new JTextArea();
        JScrollPane scrollHistory = new JScrollPane(history);

        scrollHistory.setBounds(10,10,775,450);
        history.setEditable(false);
        caret = (DefaultCaret) history.getCaret();
        caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE);
        contentPane.add(scrollHistory);

        text = new JTextField();
        text.setBounds(10, 465, 700, 30);
        text.addKeyListener(new KeyAdapter(){
            public void keyPressed(KeyEvent e){
                if(e.getKeyCode() == KeyEvent.VK_ENTER){
                    send(text.getText(),true);
                }
            }
        });
        contentPane.add(text);

        send = new JButton("Senden");
        send.setBounds(715, 465, 70, 30);
        send.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e) {
                send(text.getText(),true);
            }
        });
        contentPane.add(send);

        addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e){
                String disconnect = "/d/"+ client.getID()+"/e/";
                send(disconnect,false);
                client.close();
            }
        });

        text.requestFocusInWindow();
    }

    public void send(String message, boolean textB){
        if(message.equals("")) return;
        if(textB){
            message = client.getName() + ": " + message;
            message = "/m/"+message;
        }
        client.send(message.getBytes());
        text.setText("");
        text.requestFocusInWindow();
    }

    public void console(String message){
        history.append(message + "\n\r");
        history.setCaretPosition(history.getDocument().getLength());
    }
}

Answer 1

在方法发送中，您在此行中将文本设置为“”：

text.setText("");

这是我提到的方法：

public void send(String message, boolean textB){
if(message.equals("")) return;
if(textB){
    message = client.getName() + ": " + message;
    message = "/m/"+message;
}
client.send(message.getBytes());
text.setText("");
text.requestFocusInWindow();

}`

我想如果删除该行，文本将不会被重置，它将解决您的问题。

Java Swing JTextfield每2秒重置一次

1 个答案: