Copiar fichero con interfaz grÃ¡fica en Java

Sencillo ejemplo resuelto de cÃ³mo copiar un fichero de una carpeta a otra utilizando interfaz grÃ¡fica en Java.
El cÃ³digo estÃ¡ comentado en inglÃ©s, ya que en clase muchas veces alternÃ¡bamos inglÃ©s con castellano para ir variando el idioma de los ejercicios.
AquÃ tenÃ©is el cÃ³digo de las tres clases que se utilizan para realizar el proceso de copiar un fichero de una carpeta a otra. Las tres son necesarias para que el programa funcione correctamente.

Puedes descargar el cÃ³digo fuente en el siguiente enlace: DESCARGAR CÃ“DIGO

Clase Main

Clase ManageFiles

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

/**
 * Class to manage the files from the program.
 * @author duhnn
 */

public class ManageFiles {
	
	/*
	 * Method to copy line by line the source file to the destination file
	 */
	
	public static boolean copyFile(File source, File destination){
		
		try{
		// Declares new buffer to read line by line
		BufferedReader bufferR = new BufferedReader(
				new FileReader(source));
		// Declares new fileWriter to write the content of the
		// file
		FileWriter writer = new FileWriter(destination
				.getAbsoluteFile());
		// Uses bufferedWriter to allow string buffer and copy
		BufferedWriter bufferW = new BufferedWriter(writer);
		
		String linea;
			// While there are lines in the source file, it writes
			// them to the destination file
		while ((linea = bufferR.readLine()) != null) {
			bufferW.write(linea);
			bufferW.write(System.getProperty("line.separator"));
			// adds line separator
		}

// Close buffers to liberate memory
		bufferR.close();
		bufferW.close();

return true;
		
		}
		catch(Exception e){
			return false;
		}
	}

}

Clase Principal

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.font.LineBreakMeasurer;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

/**
 * Interface class named Principal, where the options of the program are shown
 * @author duhnn
 *
 */
public class Principal extends JFrame implements ActionListener {

private JPanel contentPane;
	private JFileChooser fileChooser;
	private File fileToCopy, destinationFile;
	//Boolean to check if source and destination file have been choosed.
	private boolean fileToCopySelected = false,
			destinationFileSelected = false;

/**
	 * Contructor of the Principal class
	 */
	public Principal() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		//Set bounds of frame
		setBounds(100, 100, 380, 180);
		contentPane = new JPanel();
		//Create empty border and set it on contentPane
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		contentPane.setLayout(new BorderLayout(0, 0));
		setContentPane(contentPane);

JPanel panel = new JPanel();
		contentPane.add(panel, BorderLayout.CENTER);
		panel.setLayout(null);
		
		//Set the position null, to show the panel centered on window.
		setLocationRelativeTo(null);

//Button to manage the file source
		JButton btnFitxerOrgen = new JButton("Select file");
		btnFitxerOrgen.setBounds(22, 23, 117, 25);
		// Adds listener to the button, to manage events
		btnFitxerOrgen.addActionListener(new ActionListener() {

@Override
			public void actionPerformed(ActionEvent arg0) {
				// Opens a JFileChooser when button clicked
				fileChooser = new JFileChooser();
				fileChooser
						.setDialogTitle("Choose a directory to copy the file");
				int returnVal = fileChooser.showOpenDialog(Principal.this);
				// If a file has been choosed, it's stored in a File variable
				if (returnVal == JFileChooser.APPROVE_OPTION) {
					fileToCopy = fileChooser.getSelectedFile();
					// set the boolean fileToCopySelected to know that there is
					// a selected file
					fileToCopySelected = true;
				}

}

});
		panel.add(btnFitxerOrgen);

//Button to manage the destination file
		JButton btnFitxerDest = new JButton("Destination file");
		btnFitxerDest.setBounds(151, 23, 185, 25);
		btnFitxerDest.addActionListener(new ActionListener() {

@Override
			public void actionPerformed(ActionEvent arg0) {
				// Opens a JFileChooser when button clicked
				fileChooser = new JFileChooser();
				fileChooser.setDialogTitle("Choose destination file");
				int returnVal = fileChooser.showOpenDialog(Principal.this);
				// If a file has been choosed, it's stored in a File variable
				if (returnVal == JFileChooser.APPROVE_OPTION) {
					destinationFile = fileChooser.getSelectedFile();
					// set destinationFolderSelected as true, to permit the
					// program to copy of the file
					destinationFileSelected = true;
				}

}
		});
		panel.add(btnFitxerDest);

//Button to copy source file to destination file
		JButton btnCopiar = new JButton("Copy file");
		btnCopiar.setBounds(207, 88, 117, 25);
		// Add event listener to the copy button
		btnCopiar.addActionListener(new ActionListener() {

@Override
			public void actionPerformed(ActionEvent arg0) {
				// Check if file has been choosed, and destination folder is
				// selected.
				if (destinationFileSelected && fileToCopySelected) {
					
					//Boolean to check if file has been copied.
					boolean isFileCopied = false;
						
					try{
						
						if(destinationFile.exists()){
							//If file exists, it ask the client to choose between overwrite or exit
							int selectedOption = JOptionPane.showConfirmDialog(
									null, "File exists, do you want to overwrite?",
									"Choose selection", JOptionPane.YES_NO_OPTION);
							if (selectedOption == JOptionPane.YES_OPTION) {
								//Calls method copyFile from ManageFiles class if option YES is selected
								isFileCopied = ManageFiles.copyFile(fileToCopy, destinationFile);								
							}
						}else{
							//Calls method copyFile from ManageFiles class if file doesn't exists
							isFileCopied = ManageFiles.copyFile(fileToCopy, destinationFile);
							
						}
						
						//Show message depending on the result of copyFile method 
					if(isFileCopied){
						JOptionPane.showMessageDialog(getContentPane(), "File "
								+ fileToCopy.getName() + " copied succesfully.");
					}else{
						JOptionPane.showMessageDialog(getContentPane(), "Error copying file");
					}
					
						
					}catch(Exception e){
						//Show the error to user
						JOptionPane.showMessageDialog(getContentPane(),"Error! "+e);	
					}

} else {
					// Error messages if there aren't files selected
					if (!destinationFileSelected && !fileToCopySelected) {
						JOptionPane
								.showMessageDialog(getContentPane(),
										"You must select a source file and a destination file");
					} else if (!destinationFileSelected) {
						JOptionPane.showMessageDialog(getContentPane(),
								"You must select a destination file.");
					} else if (!fileToCopySelected) {
						JOptionPane.showMessageDialog(getContentPane(),
								"You must select a file to copy.");

}
				}

}
		});
		panel.add(btnCopiar);
	}

@Override
	public void actionPerformed(ActionEvent arg0) {

}
}

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