我已经将多个JProgressBar添加到JTable的TableColumn中.
在进行某些计算后,我正在使用数据更新所有JProgressBar,但只添加了最后一个ProgressBar(在本例中为ProgressBar progressObj4).
如何更新所有ProgressBars？
基本要求是我在上传时显示文件进度条的状态.目前我正在硬编码4个进度条以测试所有进度条是否正在更新文件的状态,但我需要动态创建它们.进度条总数没有上传的文件数.另外,我如何获取进度条的单个实例&更新他们的状态？
我附加了添加到表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);
解决方法
基本上有两种方法可以使用
SwingWorker和Runnable #Thread进行JProgressBar,例如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));
}
@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;
}
}