JProgressBar使用示例

通过JAVA读取文件来演示JProgressBar
jar包在附件中……

import java.awt.FileDialog;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;

import javax.swing.JFrame;
import javax.swing.UnsupportedLookAndFeelException;

/*
 * TestFrame.java
 *
 * Created on 2008年10月8日, 下午2:02
 */



/**
 *
 * @author  lzkj
 */
public class TestProgressBar extends javax.swing.JFrame {

    /** Creates new form TestFrame */
    public TestProgressBar() {
        initComponents();
    }

    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {
    	this.setTitle("JProgress Bar Demo");
    	setLocation(300,300);
        bar = new javax.swing.JProgressBar();
        info = new javax.swing.JLabel();
        open = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        bar.setVisible(false);
        bar.setValue(0);
        bar.setStringPainted(true);
        
        open.setText("Open");
        open.addActionListener(new ActionListener(){

			public void actionPerformed(ActionEvent arg0) {
				// TODO Auto-generated method stub
				FileDialog fd = new FileDialog(new JFrame(),"打开文件",FileDialog.LOAD);
				fd.show(true);
				String path = fd.getDirectory();
				String fn = fd.getFile();
				info.setText("FilePath:"+path+fn);
				readFile(path+fn);
				open.setEnabled(false);
			}
        	
        });
        
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(info, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 354, Short.MAX_VALUE)
                    .addComponent(open, javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(bar, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 354, Short.MAX_VALUE))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(open)
                .addGap(18, 18, 18)
                .addComponent(info, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(bar, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>

    public void readFile(String fname){
    	new Thread(new ReadThread(fname)).start();	
    }
    
    class ReadThread implements Runnable{
    	String fileName;
    	public ReadThread(String fn){
    		fileName = fn;
    	}
		public void run() {
			// TODO Auto-generated method stub
			System.out.println("thread start......");
			long startTime = System.currentTimeMillis();
			File file = new File(fileName);
			
        	InputStream in;
    		try {
    			in = new FileInputStream(file);
//    			BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    			bar.setMaximum((int)file.length());
    			bar.setVisible(true);
    			int cv = 0;
    			int size = 0;
    			byte[] cache = new byte[256];
    			while((size = in.read(cache))>0){
    				cv+=size;    			
    				System.out.println("currentSize:"+size);
    				bar.setValue(cv);
    			}
    			System.out.println("TotalSize:"+cv);
    			System.out.println("FileSize:"+file.length());
    			bar.setVisible(false);
    			bar.setValue(0);
    			long finishTime = System.currentTimeMillis();
    			info.setText("Finish... use time : "+(finishTime-startTime)+"ms");
    			open.setEnabled(true);
    		} catch (FileNotFoundException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}catch(IOException e){
    			e.printStackTrace();
    		}
		}
    	
    }
    
    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
    	try {
			javax.swing.UIManager.setLookAndFeel("com.birosoft.liquid.LiquidLookAndFeel");
			com.birosoft.liquid.LiquidLookAndFeel.setLiquidDecorations(true);
			java.awt.EventQueue.invokeLater(new Runnable() {
	            public void run() {
	                new TestProgressBar().setVisible(true);
	            }
	        });
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (InstantiationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (UnsupportedLookAndFeelException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}        
    }

    // Variables declaration - do not modify
    private javax.swing.JProgressBar bar;
    private javax.swing.JLabel info;
    private javax.swing.JButton open;
    // End of variables declaration

}