进度条这种东西相信小伙伴们都见过，它能够让我们对加载的事物有更加清晰的了解，这次我们就来看看在java中该如何实现进度条。
代码实例：
package org.ubird;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.SwingWorker;
public class TestSwingWorker extends SwingWorker < List < Image > , String >
{
private JLabel status;
private JPanel viewer;
private String[] imagesName;
private JProgressBar jpb;
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
TestFrame frame = new TestFrame();
final JPanel panel = new JPanel();
final JLabel label = new JLabel();
final String[] imagesName = new String[38];
for (int i = 0; i < imagesName.length; i++)
{
imagesName[i] = "res/1 (" + (i + 1) + ").jpg";
}
JScrollPane sp = new JScrollPane(panel);
sp.setSize(new Dimension(700, 500));
frame.add(sp, BorderLayout.CENTER);
JPanel stp = new JPanel();
final JProgressBar jpb = new JProgressBar();
jpb.setMinimum(1);
jpb.setMaximum(imagesName.length);
stp.add(jpb);
stp.add(label);
frame.add(stp, BorderLayout.SOUTH);
JButton button = new JButton("load image");
button.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
TestSwingWorker sw = new TestSwingWorker(label, panel, imagesName, jpb);
sw.execute();
}
});
frame.add(button, BorderLayout.NORTH);
frame.setVisible(true);
}
});
}
public TestSwingWorker(JLabel status, JPanel viewer, String[] imagesName, JProgressBar jpb)
{
this.status = status;
this.viewer = viewer;
this.imagesName = imagesName;
this.jpb = jpb;
}
@Override
protected List < Image > doInBackground() throws Exception
{
List < Image > image = new ArrayList < Image > ();
for (int i = 0; i < imagesName.length; i++)
{
image.add(ImageIO.read(getClass()
.getClassLoader()
.getResource(imagesName[i])));
publish("已经加载了 " + (i + 1) + "/" + imagesName.length + " : " + imagesName[i]);
}
return image;
}
@Override
protected void process(List < String > chunks)
{
status.setText(chunks.get(chunks.size() - 1));
int x = Integer.parseInt(chunks.get(chunks.size() - 1)
.substring(chunks.get(chunks.size() - 1)
.indexOf("(") + 1, chunks.get(chunks.size() - 1)
.indexOf(")"))
.trim());
jpb.setValue(x);
for (String str: chunks)
{
System.out.println(str);
}
}
@Override
protected void done()
{
try
{
for (Image image: get())
{
JLabel label = new JLabel(new ImageIcon(image));
label.setSize(160, 120);
label.setPreferredSize(new Dimension(160, 120));
viewer.add(label);
}
}
catch (InterruptedException e)
{
e.printStackTrace();
}
catch (ExecutionException e)
{
e.printStackTrace();
}
}
}package org.ubird;
import javax.swing.JFrame;
public class TestFrame extends JFrame
{
public TestFrame()
{
setTitle("Test Frame");
setSize(800, 600);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}以上就是今天的所有内容，更多java程序代码例子敬请关注奇Q工具网了解具体。
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