使用Java快速实现进度条

基于有人问到怎样做进度条，下面给个简单的做法：

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，确实可以。不过这种方式不太优雅，当然，你可以再用线程封装也行。不过，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：

下面看代码：很简单,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); } }

该程序的可运行源码、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下直接运行