具有进度条的文件拷贝小程序

今天写一个具有进度条的文件拷贝小程序。也就是大家平常经常看见拷贝文件时候的进度条。当然此程序是用Java实现的。好了闲话少说，马上给出具体的程序代码和截图。

1、首先创建一个CopyFrame类。这类是文件拷贝的窗口主界面

package javait.org.filecopy;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.JFrame;

public class CopyFrame extends JFrame {
	private ContentPanel contentPanel;
	private ProgressBarPanel progressBarPanel;
	
	public CopyFrame() {
		super("文件拷贝小程序");
		init();
	}
	
	private void init() {
		this.setSize(350,250);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setResizable(false);
		
		contentPanel = new ContentPanel();
		progressBarPanel = new ProgressBarPanel();
		
		contentPanel.setProgressBarPanel(progressBarPanel);
		
		Toolkit kit = Toolkit.getDefaultToolkit();
		Dimension screen = kit.getScreenSize();
		Dimension frame = this.getSize();
		
		if (screen.width < frame.width) {
			frame.width = screen.width;
		}
		
		if (screen.height < frame.height) {
			frame.height = screen.height;
		}
		
		int locationWidth = (screen.width - frame.width) / 2;
		int locationHeight = (screen.height - frame.height) / 2;
		this.setLocation(locationWidth, locationHeight);
		
		this.getContentPane().add(contentPanel);
		this.getContentPane().add(progressBarPanel, BorderLayout.SOUTH);
		this.setVisible(true);
	}
	
	public static void main(String[] args) {
		new CopyFrame();
	}
}

2、创建ContentPanel类，此类主要放置按钮、文本框等基本组件。

package javait.org.filecopy;

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.FileOutputStream;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class ContentPanel extends JPanel implements ActionListener, Runnable {
	private JButton srcButton;
	private JButton targetButton;
	private JButton copyButton;
	
	private JTextField srcTextField;
	private JTextField targetTextField;
	
	private ProgressBarPanel progressBarPanel;
	
	private Thread thread;
	
	private FileInputStream fis;
	private FileOutputStream fos;
	
	String fileName = ""; //文件的名字
	
	public void setProgressBarPanel(ProgressBarPanel progressBarPanel) {
		this.progressBarPanel = progressBarPanel;
	}

	public ContentPanel() {
		srcButton = new JButton("源文件");
		targetButton = new JButton("目标文件");
		copyButton = new JButton("拷贝");
		srcTextField = new JTextField(30);
		targetTextField = new JTextField(30);
		
		this.setLayout(null); //设置布局
	
		this.add(srcTextField);
		srcTextField.setBounds(55, 30, 140, 30);
		this.add(srcButton);
		srcButton.setBounds(195, 30, 80, 30);
		
		this.add(targetTextField);
		targetTextField.setBounds(55, 63, 140, 30);
		this.add(targetButton);
		targetButton.setBounds(195, 63, 80, 30);
		
		this.add(copyButton);
		copyButton.setBounds(195, 96, 80, 30);
		
		copyButton.addActionListener(this);
		srcButton.addActionListener(this);
		targetButton.addActionListener(this);
	}

	public void actionPerformed(ActionEvent arg0) {
		// TODO Auto-generated method stub
		Object o = arg0.getSource();
		
		if (o == copyButton) {
			
			String src = srcTextField.getText();
			String target = targetTextField.getText();
			
			if ("".equals(src)) {
				JOptionPane.showMessageDialog(null, "请选择要被拷贝的文件，谢谢！");
				return;
			}
			
			if ("".equals(target)) {
				JOptionPane.showMessageDialog(null, "请选择目标文件的地址，谢谢！");
				return;
			}
			
			File srcFile = new File(src);
			System.out.println(target+fileName);
			File targetFile = new File(target+fileName);
			
			try {
				fis = new FileInputStream(srcFile);
				fos = new FileOutputStream(targetFile);
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			
			thread = new Thread(this);
			thread.start();
		}
		
		if (o == srcButton) { //点击源文件按钮
			JFileChooser fileChooser = new JFileChooser();
			fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY); //设置文件选择模式只能打开文件
			int result = fileChooser.showOpenDialog(this);
			if (result == 0) {
				File file = fileChooser.getSelectedFile();
				String path = file.getAbsolutePath();
				srcTextField.setText(path);
				srcTextField.setEditable(false); //设置文本框不可编辑
				fileName = file.getName();
			}
		}
		
		if (o == targetButton) { //点击目标地址按钮
			JFileChooser fileChooser = new JFileChooser();
			fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
			int result = fileChooser.showOpenDialog(this);
			if (result == 0) {
				File file = fileChooser.getSelectedFile();
				String path = file.getAbsolutePath();
				targetTextField.setText(path);
				targetTextField.setEditable(false);
			}
		}
	}

	public void run() {
		// TODO Auto-generated method stub
		if (progressBarPanel != null) {
			try {
				byte[] b = new byte[1024];
				int size = fis.available();
				size = size - (size % 1024) + 1024;
				float per = (float) (100 / (size / 1024.0));
				int i = 0;
				CopyEvent e = new CopyEvent();
				while (true) {
					int len = fis.read(b);
					if (len == -1) break;
					fos.write(b, 0, len);
					e.setValue((int)(per * i));
					progressBarPanel.addEvent(e);
					i++;
				}
				fis.close();
				fos.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
			
		}
	}
}

大家注意：此ContentPanel实现了一个线程，主要是完进度条的滚动效果。

3、创建ProgressBarPanel类，该类继承一个JPanel面板，主要存放进度条组件，同时实现了一个自定义的监听器CopyListener

package javait.org.filecopy;

import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;

public class ProgressBarPanel extends JPanel implements CopyListener {
	private JProgressBar bar;
	private JLabel label;
	
	public ProgressBarPanel() {
		bar = new JProgressBar(1, 100);
		bar.setStringPainted(true);
		bar.setValue(0);
		
		label = new JLabel("拷贝进度：");
		
		this.add(label);
		this.add(bar);
	}

	public void addEvent(CopyEvent e) { //在计算或者获取进度的拷贝文件进度值
		// TODO Auto-generated method stub
		/*if (e.getValue() == 100) {
			bar.setValue(100);
		}
		bar.setValue(e.getValue());*/
		if ((e.getValue() + 1) == 100) {
			bar.setValue(100);
		}
		bar.setValue(e.getValue() + 1); //设置进度条的百分比
	}
}

4、创建自定义一个监听器CopyListener

package javait.org.filecopy;

public interface CopyListener {
	public void addEvent(CopyEvent e);
}

5、创建自定义拷贝文件事件

package javait.org.filecopy;

public class CopyEvent {
	int value;

	public int getValue() {
		return value;
	}

	public void setValue(int value) {
		this.value = value;
	}
}

下面为了让大家能够看到上面程序的效果。我给出程序运行的效果图