使用Java高速实现进度条

基于有人问到如何做进度条，以下给个简单的做法：

主要是使用JProgressBar（Swing内置javax.swing.JProgressBar）和SwingWorker（Swing内置javax.swing.SwingWorker）

有人肯定会说，不是用线程做的吗？使用线程共享一个变量，确实能够。只是这样的方式不太优雅，当然，你能够再用线程封装也行。只是，SwingWorker已经帮我们封装好啦～～使用现成的东西来做还是方便^_^

先看效果：

以下看代码：非常easy,相信各位大大肯定是懂的～

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("已经载入了 "+(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);
}
}

该程序的可执行源代码、资源图片的下载地址：http://download.csdn.net/source/3245370

NOTE：解压后双击里面的：CompileAndRun.bat可在Win下直接执行