io와 swing 활용 : 이미지파일 카피

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.io.*;

public class  JTextFieldDemo extends JFrame implements ActionListener
{
	JTextField tf1, tf2;
	JButton bt;
	JLabel res;
	JProgressBar pb;
	JPasswordField pwd;
	

	public JTextFieldDemo() {
		super(":::JTextFieldDemo:::");
		makeGui();
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}//생성자----------
	public void makeGui() {
		Container cp=getContentPane();
		cp.setLayout(new GridLayout(0,1));//행은 가변적, 열은 1열로 고정
		tf1=new JTextField();
		tf2=new JTextField();
		cp.add(tf1);
		cp.add(tf2);
		//프로그래스바 생성 및 부착
		pb=new JProgressBar();
		cp.add(pb);
		pb.setStringPainted(true);
		bt=new JButton("COPY", new ImageIcon("./img/img06.gif"));
		cp.add(bt);
		ImageIcon ic=new ImageIcon("./img/img05.gif");
		res=new JLabel("결과",ic,JLabel.CENTER);
		JScrollPane sp=new JScrollPane(res);//라벨에 스크롤바를 붙인다
		cp.add(sp);
		tf1.setBorder(new TitledBorder("원본파일(이미지파일)"));
		tf2.setBorder(new TitledBorder("목적파일"));

		bt.addActionListener(this);

	}//----------
	public void actionPerformed(ActionEvent e)  {
		Object o=e.getSource();
		if(o==bt) {
			//fileCopy();
			Thread tr=new MyThread();
			tr.start();
		}
	}//----------
	class MyThread extends Thread
	{
		public void run() {
			fileCopy();
		}
	}/////////////////
	public void fileCopy()  {
		FileInputStream fis=null;
		FileOutputStream fos=null;
		BufferedInputStream bis=null;
		BufferedOutputStream bos=null;
		
		//./img/img01.gif를 ./img/target.gif로 복사해 보자
		try
		{
			String source=tf1.getText().trim();
			String target=tf2.getText().trim();
			File sourceFile=new File(source);
			File targetFile=new File(target);
			//스트림 연결해서 읽고 쓰고 하자.
			fis =new FileInputStream(sourceFile);
			bis =new BufferedInputStream(fis);
			fos =new FileOutputStream(targetFile);
			bos =new BufferedOutputStream(fos);
			int n=0;
			int count=0;
			long filesize=sourceFile.length();//파일크기
			byte ba[]=new byte[1024];  //배열에 담아서 읽어들임
			while ((n=bis.read(ba)) != -1) 
			{
				count +=n;//읽은 바이트수, 프로그래스바에 설정
				//int per=(읽은바이트수/전체파일크기)*100
				pb.setValue(count);
				long per=(count*100/filesize);
				pb.setString ((int)(pb.getPercentComplete()*100)+" % 진행");
				
				bos.write(ba,0,n);
				bos.flush();
				try	{
					Thread.sleep(100);//0.1초 슬립
				}
				catch (Exception e) {
					e.printStackTrace();
				}

			}//while---
			bis.close(); bos.close();
			fis.close(); fos.close();
			//라벨의 아이콘 변경 작업.....
			ImageIcon i=new ImageIcon(target);
			res.setIcon(i);

		}
		catch (IOException e)
		{
			JOptionPane.showMessageDialog(this,e.getMessage());
		}
	}//fileCopy()-------

	public static void main(String[] args) 
	{
		JTextFieldDemo jfc=new JTextFieldDemo();
		jfc.setSize(300,400);
		jfc.setVisible(true);
	}
}