关于网友提出的“ 怎么在现有的程序中加入进度条功能及进度条如何实现”问题疑问，本网通过在网上对“ 怎么在现有的程序中加入进度条功能及进度条如何实现”有关的相关答案进行了整理，供用户进行参考，详细问题解答如下：
问题： 怎么在现有的程序中加入进度条功能及进度条如何实现
描述: 现在的项目基本上做完了,但有些功能需要很长时间的计算,得等上一会儿,所以想做个进度条功能,向大虾们请教一下,如何实现进度条及如何将进度条加到我现在的程序中.我不太清楚怎么做,但大概是起一个新的线程,同时启动进度条.但不知道怎么实现,请大虾帮帮忙!
解决方案1: /**
* @author xuwanhong_sun@hotmail.com
* @version 1.0.0
*/
package org.mysoft.JSQGUI;
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class WaitThread
{
public static JDialog dialog;
private Dimension dimensions = Toolkit.getDefaultToolkit().getScreenSize();
private int width = dimensions.width * 3 / 10, height = 75;
private Window parent;
private String message;
private ActionThread actionThread;
private Map threads;
public WaitThread(Window parent,String message)
{
this.parent = parent;
this.message = message;
initGUI();
}
public WaitThread(Window parent,String message,Map threads)
{
this.parent = parent;
this.message = message;
this.threads = threads;
initGUI();
}
protected void initGUI()
{
if(parent instanceof Frame)
{
dialog = new JDialog((Frame)parent, "请稍等" +
"...", true);
}
else if(parent instanceof Dialog)
{
dialog = new JDialog((Dialog)parent, "请稍等" +
"...", true);
}
else
{
dialog = new JDialog();
dialog.setTitle("请稍等" + "...");
dialog.setModal(true);
}
dialog.setCursor(new Cursor(Cursor.WAIT_CURSOR));
JLabel infoLabel = new JLabel(message, JLabel.CENTER);
JPanel infoPanel = new JPanel(new BorderLayout());
infoPanel.add(infoLabel, BorderLayout.CENTER);
dialog.getContentPane().add(infoPanel);
int left = (dimensions.width - width)/2;
int top = (dimensions.height - height)/2;
dialog.setSize(new Dimension(width,height));
dialog.setLocation(left, top);
}
public void start()
{
SwingUtilities.invokeLater(new startThread());
}
public void startMore()
{
SwingUtilities.invokeLater(new startMoreThread());
}
public void actionPerformed()
{
}
class startThread extends Thread
{
public void run()
{
new ShowDialog().start();
actionThread = new ActionThread();
actionThread.start();
new CloseDialog().start();
}
}
class startMoreThread extends Thread
{
public void run()
{
new ShowDialog().start();
if (threads != null)
{
for (Iterator iter = threads.values().iterator();
iter.hasNext();)
{
((Thread)iter.next()).start();
}
}
new CloseDialog().start();
}
}
class ActionThread extends Thread
{
public void run()
{
actionPerformed();
}
}
class ShowDialog extends Thread
{
public void run()
{
dialog.show();
}
}
class CloseDialog extends Thread
{
public void run()
{
if (actionThread != null)
{
try
{
actionThread.join();
}
catch(InterruptedException e)
{
e.printStackTrace(System.out);
}
}
else if(threads != null)
{
Thread tmpThread = null;
while (true)
{
try
{
Thread.currentThread().sleep(250);
}
catch(InterruptedException e)
{
e.printStackTrace(System.out);
}
for( Iterator iter = threads.values().iterator();
iter.hasNext();)
{
tmpThread = (Thread)iter.next();
if(!tmpThread.isAlive())
{
iter.remove();
}
}
if (threads.isEmpty())
{
break;
}
}
}
dialog.dispose();
}
}
}
这个程序可以帮你完成你想要的功能，呵呵，
解决方案2: 其实用进度条并不是最好的方法,可以选择用SPLASH,即开机画面
下面是进度条的例子,你参考下吧
/**
@version 1.03 2004-08-22
@author Cay Horstmann
*/
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.Timer;
/**
This program demonstrates the use of a progress bar
to monitor the progress of a thread.
*/
public class ProgressBarTest
{
public static void main(String[] args)
{
JFrame frame = new ProgressBarFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
/**
A frame that contains a button to launch a simulated activity,
a progress bar, and a text area for the activity output.
*/
class ProgressBarFrame extends JFrame
{
public ProgressBarFrame()
{
setTitle("ProgressBarTest");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
// this text area holds the activity output
textArea = new JTextArea();
// set up panel with button and progress bar
JPanel panel = new JPanel();
startButton = new JButton("Start");
progressBar = new JProgressBar();
progressBar.setStringPainted(true);
panel.add(startButton);
panel.add(progressBar);
checkBox = new JCheckBox("indeterminate");
checkBox.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
progressBar.setIndeterminate(checkBox.isSelected());
}
});
panel.add(checkBox);
add(new JScrollPane(textArea), BorderLayout.CENTER);
add(panel, BorderLayout.SOUTH);
// set up the button action
startButton.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
progressBar.setMaximum(1000);
activity = new SimulatedActivity(1000);
new Thread(activity).start();
activityMonitor.start();
startButton.setEnabled(false);
}
});
// set up the timer action
activityMonitor = new Timer(500, new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
int current = activity.getCurrent();
// show progress
textArea.append(current + "\n");
progressBar.setStringPainted(!progressBar.isIndeterminate());
progressBar.setValue(current);
// check if task is completed
if (current == activity.getTarget())
{
activityMonitor.stop();
startButton.setEnabled(true);
}
}
});
}
private Timer activityMonitor;
private JButton startButton;
private JProgressBar progressBar;
private JCheckBox checkBox;
private JTextArea textArea;
private SimulatedActivity activity;
public static final int DEFAULT_WIDTH = 400;
public static final int DEFAULT_HEIGHT = 200;
}
/**
A similated activity runnable.
*/
class SimulatedActivity implements Runnable
{
/**
Constructs the simulated activity thread object. The
thread increments a counter from 0 to a given target.
@param t the target value of the counter.
*/
public SimulatedActivity(int t)
{
current = 0;
target = t;
}
public int getTarget()
{
return target;
}
public int getCurrent()
{
return current;
}
public void run()
{
try
{
while (current < target)
{
Thread.sleep(100);
current++;
}
}
catch(InterruptedException e)
{
}
}
private volatile int current;
private int target;
}
以上介绍了“ 怎么在现有的程序中加入进度条功能及进度条如何实现”的问题解答，希望对有需要的网友有所帮助。
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