從偵聽器將數據寫入 txt 文件

Question

我創建了一個 window 來接收用戶輸入的數據。 但我無法將該數據保存在 txt 文件中。 txt 文件有一個用戶列表，其中包含以下數據（姓名、姓氏、email 等），目的是向該文件添加新用戶。 使用的方法必須通過偵聽器。

我的項目結構如下：

1. Class：主要
2. 接口：window 和 window 創建用戶（這里收集數據）
3. 監聽器：按鈕查看用戶創建用戶按鈕刪除用戶按鈕退出按鈕
4. 類：用戶和兩個枚舉類型

window接口創建用戶：

public class buttonCreateUsersActionListener implements ActionListener {
private Window window;


public buttonCreateUsersActionListener () {
    this.window = window;
}

@Override
public void actionPerformed(ActionEvent e) {
    // TODO Auto-generated method stub

}

}

window 創建用戶（這里收集數據）

public class CreateUserWindow extends JFrame implements ActionListener {

private JLabel labelSubtitle, labelName, labelLastname, labelEmail, labelSex, labelStateCivil, lblFormatDate;
private static JTextField txtName;
private static JTextField txtLastname;
private static JTextField txtEmail;
private JTextField txtDate;
private JButton btnSave, btnCancel;
private Choice chStateCivil;
private final ButtonGroup buttonGroup = new ButtonGroup ();

publicWindowCreateUser () {
    String userList = "";
    components ();

    setDefaultCloseOperation (JFrame.DO_NOTHING_ON_CLOSE);
    setSize (400,450); // Window Size Width and Length
    setLocationRelativeTo (null); // Center the window on the monitor
    getContentPane (). setLayout (null);
    setResizable (false); // prevents the window size from being modified
    setVisible (true); // make the window visible
    setTitle ("Create and add a user"); // Give the window a title

}

public void components () {

    labelSubtitulo = new JLabel ();
    labelSubtitulo.setFont (new Font ("Tahoma", Font.PLAIN, 13));
    labelSubtitulo.setBounds (92, 20, 260, 20);
    labelSubtitulo.setText ("Fill all the boxes");
    getContentPane (). add (labelSubtitulo);

    / * --------- Fields --------- * /

    labelName = new JLabel (); // label
    labelName.setBounds (20, 50, 150,20);
    labelName.setText ("Name");
    getContentPane (). add (labelName);

    txtName = new JTextField (); // box to fill
    txtName.setBounds (165, 50, 215, 20);
    getContentPane (). add (txtName);

    labelLastname = new JLabel ();
    labelLastname.setBounds (20, 80, 150, 20);
    labelLastname.setText ("Lastname");
    getContentPane (). add (labelLastname);

    txtLastname = new JTextField ();
    txtLastname.setBounds (165, 80, 215, 20);
    getContentPane (). add (txtLastname);

    labelEmail = new JLabel ();
    labelEmail.setBounds (20, 110, 110, 20);
    labelEmail.setText ("Email");
    getContentPane (). add (labelEmail);

    txtEmail = new JTextField ();
    txtEmail.setBounds (165, 110, 215, 20);
    getContentPane (). add (txtEmail);

    labelSexo = new JLabel ();
    labelSex.setBounds (20, 140, 50, 20);
    labelSex.setText ("Sex");
    getContentPane (). add (labelSex);

    JRadioButton rdbtnMan = new JRadioButton ("Man");
    buttonGroup.add (rdbtnMan);
    rdbtnMan.setBounds (165, 139, 80, 25);
    getContentPane (). add (rdbtnMan);

    JRadioButton rdbtnMujer = new JRadioButton ("Female");
    buttonGroup.add (rdbtnFemale);
    rdbtnMujer.setBounds (249, 140, 69, 25);
    getContentPane (). add (rdbtnFemale);

    labelEstadoCivil = new JLabel ();
    labelEstadoCivil.setBounds (20, 170, 80, 20);
    labelEstadoCivil.setText ("Civil Status");
    getContentPane (). add (labelStateCivil);

    chEstadoCivil = new Choice ();
    chEstadoCivil.setBounds (165, 168, 110, 20);
    chEstadoCivil.add ("Single");
    chEstadoCivil.add ("Married");
    chEstadoCivil.add ("Divorced");
    chEstadoCivil.add ("Widower");
    getContentPane (). add (chStateCivil);

    JLabel birthdate = new JLabel ("Date of birth");
    birthdate.setBounds (20, 203, 128, 16);
    getContentPane (). add (birthdate);

    txtDate = new JTextField ();
    txtDate.setBounds (165, 203, 110, 22);
    getContentPane (). add (txtDate);
    txtDate.setColumns (10);

    lblFormatDate = new JLabel ("[format DD / MM / YYYY]");
    lblFormatDate.setFont (new Font ("Tahoma", Font.PLAIN, 11));
    lblFormatDate.setBounds (20, 219, 138, 16);
    getContentPane (). add (lblFormatDate);

    /*---------- Buttons ----------*/

    btnSave = new JButton ();
    btnSave.setBounds (100, 350, 100, 20);
    btnSave.setText ("Save");
    btnSave.addActionListener (this);
    getContentPane (). add (btnSave);

    btnCancel = new JButton ();
    btnCancelar.setBounds (220, 350, 100, 20);
    btnCancelar.setText ("Cancel");
    btnCancelar.addActionListener (this);
    getContentPane (). add (btnCancelar);

}
@Override
public void actionPerformed (ActionEvent e) {
    if (e.getSource (). equals (btnSave)) {// We launch a routine to write the data
        this.dispose ();
        User user = null;
        Window.listUsers.add (student);
    }
}
public String getName () {
    return txtName.getText ();
}
public static String getLastname () {
    return txtLastname.getText ();
}
public static String getEmail () {
    return txtEmail.getText ();
}
public String getSex () {
    return labelSexo.getText ();
}
public String getStateCivil () {
    return labelCivilState.getText ();
}
public String getBirthDate () {
    return lblFormatDate.getText ();
}
}

Answer 1

這將為您編寫一個文件，前提是您可以獲得要寫入文件的字符串，並且您可以獲得文件的路徑/名稱。

@Override
public void actionPerformed(ActionEvent e) {
    String content = getContent(); //You said you know how to do this.
    try( BufferedWriter writer = Files.newBufferedWriter( 
            Paths.get( filename ), 
            StandardOpenOption.CREATE,
            StandardOpenOption.APPEND );){
            writer.write(content);
    } catch (IOException e){
        //You might want to do something useful here.
        throw new RuntimeException(e);
    }
}