java的进度条

 

package com.jkds.sxltquery.onetaxpayer;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.LineBorder;
import java.lang.reflect.InvocationTargetException;

/**
 * Created by IntelliJ IDEA.
 * User: Administrator
 * Date: 2009-7-5
 * Time: 16:24:34
 * To change this template use File | Settings | File Templates.
 */
public class SliderDemo extends JFrame {
    JProgressBar progressBar;
    JButton startButton;
    JButton stopButton;
    JTextArea output;
    private int num = 50;//default number
    Object lock = new Object();
    boolean shouldStop;//should thread to be stopped
    Thread myThread;

    public static void main(String[] args) {
        SliderDemo frame = new SliderDemo();
        frame.pack();
        frame.setVisible(true);
    }

    public SliderDemo() {
        setTitle("Demo of Slider");
        Container content = getContentPane();

//value is from 0 to 100,initial value is 50
        JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, num);
        slider.addChangeListener(new SliderListener());
        slider.setMajorTickSpacing(10);
        slider.setMinorTickSpacing(2);
        slider.setPaintTicks(true);
        slider.setPaintLabels(true);

        ButtonListener buttonListener = new ButtonListener();
        startButton = new JButton("Start");
        startButton.addActionListener(buttonListener);
        stopButton = new JButton("Stop");
        stopButton.addActionListener(buttonListener);

        progressBar = new JProgressBar();
        progressBar.setValue(0);
        progressBar.setStringPainted(true);

//use textarea to show the counter
        output = new JTextArea(5, 20);
        output.setMargin(new Insets(5, 5, 5, 5));
        output.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(output);

        JPanel panel = new JPanel();
        panel.add(startButton);
        panel.add(stopButton);
        panel.add(progressBar);

        content.add(slider, BorderLayout.NORTH);
        content.add(scrollPane, BorderLayout.CENTER);
        content.add(panel, BorderLayout.SOUTH);

        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

//listener to the start button
    class ButtonListener implements ActionListener {
        public void actionPerformed(ActionEvent event) {
//start the task
            if (event.getSource() == startButton) {
                startButton.setEnabled(false);
                if (myThread == null) {
                    myThread = new TaskThread(num);//create a task thread
                    shouldStop = false;
                    myThread.start();//start the task thread
                }
            } else {//end the task
                synchronized (lock) {
                    shouldStop = true;
                    lock.notify();//notify thread if stopped
                }
            }
        }
    }

//listen to the slider
    class SliderListener implements ChangeListener {
        public void stateChanged(ChangeEvent e) {
            JSlider source = (JSlider) e.getSource();
            if (!source.getValueIsAdjusting()) {
                num = (int) source.getValue();
            }
        }
    }

//task will be executed in a thread and monitored by a progress bar
    class TaskThread extends Thread {
        private int max;

        public TaskThread(int max) {
            this.max = max;
        }

        public void run() {
            int min = 0;
            progressBar.setValue(min);
            progressBar.setMinimum(min);
            progressBar.setMaximum(max);

            Runnable runner = new Runnable() {
                public void run() {
                    int value = progressBar.getValue();
                    value++;//increase counter value
                    progressBar.setValue(value);//change current value of progress bar
                    output.setText("Number:" + value);
                }
            };

            for (int i = min; i < max; i++) {
                try {//block until AWT events hava been processed
                    SwingUtilities.invokeAndWait(runner);
                } catch (InvocationTargetException e) {
                    break;
                } catch (InterruptedException e) {
//Ignore Exception
                }

                synchronized (lock) {
                    if (shouldStop)//check if Stop is pressed
                        break;
                    try {
                        lock.wait(100);
                    } catch (InterruptedException e) {
//Ignore Exception
                    }
                }
            }

            startButton.setEnabled(true);//enable button
            myThread = null;
        }
    }
}

 

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