我已将多个 JProgressBar 添加到 JTable 的 TableColumn 中。

我在进行某些计算后用数据更新所有 JProgressBar，但只有最后一个 ProgressBar(在本例中为 ProgressBar progressObj4)已添加正在更新。

如何更新所有 ProgressBar？

基本要求是我在上传时在进度条中显示文件的状态。目前我正在对 4 个进度条进行硬编码以测试是否所有进度条都根据文件的状态进行更新，但我需要动态创建它们。进度条总数与正在上传的文件数有关。另外，如何获取进度条的各个实例并更新它们的状态？

我附上添加到表格列的进度条的源代码。

//tc = object of TableColumn

progressObj1 = new ProgressBarRenderer("Progress1");
progressObj1.setValue(0);
progressObj1.setStringPainted(true);
progressObj1.setBackground(Color.WHITE);
progressObj1.setBorderPainted(true);

tc.setCellRenderer(progressObj1);

progressObj2 = new ProgressBarRenderer("Progress2");
progressObj2.setValue(0);
progressObj2.setStringPainted(true);
progressObj2.setBackground(Color.WHITE);
progressObj2.setBorderPainted(true);

tc.setCellRenderer(progressObj2);

progressObj3 = new ProgressBarRenderer("Progress3");
progressObj3.setValue(0);
progressObj3.setStringPainted(true);
progressObj3.setBackground(Color.WHITE);
progressObj3.setBorderPainted(true);

tc.setCellRenderer(progressObj3);

progressObj4 = new ProgressBarRenderer("Progress4");
progressObj4.setValue(0);
progressObj4.setStringPainted(true);
progressObj4.setBackground(Color.WHITE);
progressObj4.setBorderPainted(true);

tc.setCellRenderer(progressObj4);

最佳答案

基本上有两种方法可以通过使用 SwingWorker 来移动 JProgressBar和 Runnable#Thread，SwingWorker

import java.awt.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;

public class TableCellProgressBar {

    private String[] columnNames = {"String", "ProgressBar"};
    private Object[][] data = {{"dummy", 100}};
    private DefaultTableModel model = new DefaultTableModel(data, columnNames) {
        private static final long serialVersionUID = 1L;

        @Override
        public Class<?> getColumnClass(int column) {
            return getValueAt(0, column).getClass();
        }

        @Override
        public boolean isCellEditable(int row, int col) {
            return false;
        }
    };
    private JTable table = new JTable(model);

    public JComponent makeUI() {
        TableColumn column = table.getColumnModel().getColumn(1);
        column.setCellRenderer(new ProgressRenderer());
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                startTask("test");
                startTask("error test");
                startTask("test");
            }
        });
        JPanel p = new JPanel(new BorderLayout());
        p.add(new JScrollPane(table));
        return p;
    }
//http://java-swing-tips.blogspot.com/2008/03/jprogressbar-in-jtable-cell.html

    private void startTask(String str) {
        final int key = model.getRowCount();
        SwingWorker<Integer, Integer> worker = new SwingWorker<Integer, Integer>() {

            private int sleepDummy = new Random().nextInt(100) + 1;
            private int lengthOfTask = 120;

            @Override
            protected Integer doInBackground() {
                int current = 0;
                while (current < lengthOfTask && !isCancelled()) {
                    if (!table.isDisplayable()) {
                        break;
                    }
                    if (key == 2 && current > 60) { //Error Test
                        cancel(true);
                        publish(-1);
                        return -1;
                    }
                    current++;
                    try {
                        Thread.sleep(sleepDummy);
                    } catch (InterruptedException ie) {
                        break;
                    }
                    publish(100 * current / lengthOfTask);
                }
                return sleepDummy * lengthOfTask;
            }

            @Override
            protected void process(java.util.List<Integer> c) {
                model.setValueAt(c.get(c.size() - 1), key, 1);
            }

            @Override
            protected void done() {
                String text;
                int i = -1;
                if (isCancelled()) {
                    text = "Cancelled";
                } else {
                    try {
                        i = get();
                        text = (i >= 0) ? "Done" : "Disposed";
                    } catch (Exception ignore) {
                        ignore.printStackTrace();
                        text = ignore.getMessage();
                    }
                }
                System.out.println(key + ":" + text + "(" + i + "ms)");
            }
        };
        model.addRow(new Object[]{str, 0});
        worker.execute();
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                createAndShowGUI();
            }
        });
    }

    public static void createAndShowGUI() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.getContentPane().add(new TableCellProgressBar().makeUI());
        frame.setSize(320, 240);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
}

class ProgressRenderer extends DefaultTableCellRenderer {

    private final JProgressBar b = new JProgressBar(0, 100);

    public ProgressRenderer() {
        super();
        setOpaque(true);
        b.setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
    }

    @Override
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
        Integer i = (Integer) value;
        String text = "Completed";
        if (i < 0) {
            text = "Error";
        } else if (i < 100) {
            b.setValue(i);
            return b;
        }
        super.getTableCellRendererComponent(table, text, isSelected, hasFocus, row, column);
        return this;
    }
}

关于java - 将多个 JProgressBar 添加到 JTable 的 TableColumn，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7036036/