Question

我的目标是将JList与我的数据库中的数据放在2个JTextFields上，但我不知道该怎么做。你们男孩和女孩知道错误是什么以及我如何解决它？（变量personList包含所有数据。只需要将它放在JList中。但是这个变量personList是一个ArrayList。）

public class Datenbank2 extends JFrame {

public Datenbank2() {
    super("Datenbank der Lehrlinge 1 Lehrjahr");

    JPanel centerPanel = new JPanel();
    JPanel southPanel = new JPanel();
    JPanel linkesPanel = new JPanel();

    this.setBounds(600, 300, 500, 450);
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);


    try {
        Class.forName("org.sqlite.JDBC");
        Connection connection = DriverManager
                .getConnection("jdbc:sqlite:C://Users/N-YP/workspace/UebungJava/ch/nyp/uebungen/datenbanken/SqLiteDB.db");
        Statement statement = connection.createStatement();

        ResultSet rs = statement.executeQuery("SELECT * FROM Person");

        ArrayList<JLabel> personList = new ArrayList<JLabel>();

        while (rs.next()) {
            String vorname = rs.getString("Vorname");
            String nachname = rs.getString("Nachname");
            personList.add(new JLabel(vorname + " " + nachname));
            System.out.println(vorname + "  " + nachname);
        }


        JTextField eingVorname = new JTextField();
        JTextField eingNachname = new JTextField();
        eingVorname.setPreferredSize(new Dimension(230, 30));
        eingNachname.setPreferredSize(new Dimension(230, 30));

        BorderLayout borderLayout = new BorderLayout();
        this.getContentPane().setLayout(borderLayout);

        this.add(centerPanel, BorderLayout.CENTER);
        this.add(southPanel, BorderLayout.SOUTH);
        centerPanel.add(linkesPanel, BorderLayout.WEST);
        FlowLayout flowLayout = new FlowLayout();

        centerPanel.setLayout(flowLayout);
        for (JLabel personLabel : personList) {
            centerPanel.add(personLabel);
        }

        southPanel.setLayout(flowLayout);
        southPanel.add(eingVorname);
        southPanel.add(eingNachname);
    }

    catch (Exception exc) {
        exc.printStackTrace();
        System.exit(0);
        System.out
                .println("Datenbank geöffnet (muss später aber wieder geschlossen werden).");

    }
}

public static void main(String[] args) {
    Datenbank2 javamitdb = new Datenbank2();
    javamitdb.setVisible(true);
}

}

谢谢你，祝你有个美好的一天。

Answer 1

在while循环中使用DefaultListModel及其 addElement（）方法以添加每个结果，如下所示：

listModel = new DefaultListModel();
while (rs.next()) {
        String vorname = rs.getString("Vorname");
        String nachname = rs.getString("Nachname");
        listModel.addElement(vorname + " " + nachname);
        System.out.println(vorname + "  " + nachname);
    }
//then create a list with this model
list = new JList(listModel);

请查看How to Use Lists以获取更多信息。

添加JList以显示基本数据库信息

1 个答案: