如何“动画”将行添加到 JTable

Question

我想在每次添加一行时显示 JTable。 我在下面编写的代码向表中添加了一个新行，然后显示 jtable 2 秒，然后添加另一行，然后显示表。但是 jtable 没有显示， 仅在添加所有行后显示

        Vector<Object> rowVector = null;
        while(rs.next()){
            rowVector = new Vector<Object>();
            for(int i=1;i<=columnCount;i++){
                rowVector.add(rs.getString(i));
                //System.out.print(rs.getString(i));
            }

            System.out.println(rowVector.toString());
            //data.add(rowVector);
            model.addRow(rowVector);
            JTable table1 = new JTable(model);
            JTableHeader header1 = table1.getTableHeader();
            table1.setEnabled(false);
            header1.setResizingAllowed(false);
            header1.setReorderingAllowed(false);
            header1.setForeground(Color.white);
            header1.setBackground(Color.black); 
            jpanedisplay.setViewportView(table1);           
            jpanedisplay.getViewport().setBackground(Color.white);
            jpanedisplay.setBorder(BorderFactory.createLineBorder(Color.black));
            Thread.sleep(3000);

        }

Answer 1

您在每次迭代中创建一个新的JTable，您不需要这样做。在循环之前将模型添加到表中。只需在循环中向模型添加行

DefaultTableModel model = new DefaultTableModel(columnNames, 0);
JTable table = new JTable(model);

table.setEnabled(false);
JTableHeader header1 = table.getTableHeader();
header1.setResizingAllowed(false);
header1.setReorderingAllowed(false);
header1.setForeground(Color.white);
header1.setBackground(Color.black); 
jpanedisplay.setViewportView(table1);           
jpanedisplay.getViewport().setBackground(Color.white);
jpanedisplay.setBorder(BorderFactory.createLineBorder(Color.black));

...

while(rs.next()){
     Vector<Object> rowVector = new Vector<Object>();
     for(int i=1;i<=columnCount;i++){
         rowVector.add(rs.getString(i));
            //System.out.print(rs.getString(i));
     }
     model.addRow(rowVector);

     // DON'T CALL Thread.sleep();
}

---

更新

如果您不想在数据库任务完成之前添加表，只需使用一种方法

private JTable createTable(ResultSet rs) {
    DefaultTableModel model = new DefaultTableModel(columnNames, 0);
    JTable table = new JTable(model);

    table.setEnabled(false);
    JTableHeader header1 = table.getTableHeader();
    header1.setResizingAllowed(false);
    header1.setReorderingAllowed(false);
    header1.setForeground(Color.white);
    header1.setBackground(Color.black);

    while(rs.next()){
        Vector<Object> rowVector = new Vector<Object>();
        for(int i=1;i<=columnCount;i++){
            rowVector.add(rs.getString(i));

        }
        model.addRow(rowVector);
    }

    return table;
}

然后你可以将它添加到任何面板

panel.add(new JScrollPane(createTable(rs));

---

UPDATE #2

在 Op 解释说他们试图动态查看添加的行之后，而不是一次全部添加。

我使用java.swing.Timer 来添加行。

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
import javax.swing.table.DefaultTableModel;

public class TestTimerTable {

    String[] cols = {"ID", "Name", "Country Code", "District", "Population"};
    DefaultTableModel model = new DefaultTableModel(cols, 0);
    JTable table = new JTable(model);
    ResultSet rs = null;
    JButton start = new JButton("Start");
    Timer timer = new Timer(0, null);

    public TestTimerTable() {
        initDB();

        JScrollPane scroll = new JScrollPane(table);
        scroll.setViewportView(table);

        JFrame frame = new JFrame("Test Timer Table");
        frame.add(scroll);
        frame.add(start, BorderLayout.SOUTH);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);

        timer = new Timer(200, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    if (rs.next()) {
                        String s1 = rs.getString(1);
                        String s2 = rs.getString(2);
                        String s3 = rs.getString(3);
                        String s4 = rs.getString(4);
                        String s5 = rs.getString(5);
                        model.addRow(new Object[]{s1, s2, s3, s4, s5});
                    } else {
                        ((Timer) e.getSource()).stop();
                    }
                } catch (SQLException ex) {
                    ex.printStackTrace();
                }
            }
        });
        start.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                timer.start();
            }
        });
    }

    private void initDB() {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection(
                    "jdbc:mysql://localhost/...", "...", "...");
            PreparedStatement ps = conn.prepareStatement("SELECT *  FROM city");
            rs = ps.executeQuery();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

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