Java - 加载JTabbedPane一个选项卡 [英] Java - Load JTabbedPane one tab after another

问题描述

我有一个JTabbedPane有4个标签。我想加载1个标签1个接一个，因为标签使用，引用和检索从同一个数据库。这是在我的应用程序中导致数据库被锁定的问题。

I have a JTabbedPane with 4 tabs. I would like to load 1 tab 1 after another as the tabs uses, refers and retrieves from the same database. And this is causing an issue of "Database is locked" in my application.

感谢您的帮助和建议：）

Thanks in advance for the help and suggestions :)

这是我如何创建JTabbedPane

This is how I create the JTabbedPane

    JTabbedPane tabbedPane = new JTabbedPane();
    tabbedPane.setBounds(0, 0, 450, 300);

    tabbedPane.addTab("tab1", new class1UseDb());
    tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);

    tabbedPane.addTab("tab2", new class2UseDb());
    tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);

    tabbedPane.addTab("tab3", new class3UseDb());
    tabbedPane.setMnemonicAt(2, KeyEvent.VK_3);

    tabbedPane.addTab("tab4", new class());
    tabbedPane.setMnemonicAt(3, KeyEvent.VK_4);

推荐答案

基于示例，以下 sscce 仅创建一个新的面板，每次单击添加按钮并填写结果。在实际程序中，您可能需要使用 SwingWorker 以管理延迟和资源。

Based on this example, the sscce below simply creates a new panel for each click on the Add button and fills in the result. In a real program, you may want to use a SwingWorker to manage latency and resources.

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import org.h2.jdbcx.JdbcDataSource;

/**
 * @see http://stackoverflow.com/a/19860170/230513
 * @see http://stackoverflow.com/a/15715096/230513
 * @see http://stackoverflow.com/a/11949899/230513
 */
public class TabData {

    private int n = 1;

    private void display() {
        JFrame f = new JFrame("TabData");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final JTabbedPane jtp = new JTabbedPane();
        jtp.add(String.valueOf(n), createPane());
        f.add(jtp, BorderLayout.CENTER);
        JPanel p = new JPanel(new FlowLayout(FlowLayout.RIGHT));
        p.add(new JButton(new AbstractAction("Add") {
            @Override
            public void actionPerformed(ActionEvent e) {
                jtp.add(String.valueOf(++n), createPane());
                jtp.setSelectedIndex(n - 1);
            }
        }));
        f.add(p, BorderLayout.SOUTH);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    private JPanel createPane() {
        JPanel p = new JPanel();
        JLabel l = new JLabel();
        p.add(new JLabel("Result: "));
        p.add(l);
        JdbcDataSource ds = new JdbcDataSource();
        ds.setURL("jdbc:h2:file:~/src/java/jdbc/test;IFEXISTS=TRUE");
        ds.setUser("sa");
        ds.setPassword("");
        try {
            Connection conn = ds.getConnection();
            Statement s = conn.createStatement();
            ResultSet rs = s.executeQuery("SELECT RAND() FROM DUAL");
            rs.next();
            l.setText(rs.getString(1));
        } catch (SQLException ex) {
            ex.printStackTrace(System.err);
        }

        return p;
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new TabData().display();
            }
        });
    }
}

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