decompressjpanel.java

基于哈夫曼树的压缩解压程序源代码

package GUI;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

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

public class DecompressJPanel {

	// The name of the decompressed file
	JTextField textFieldOfDecompress;

	// The name of the target file
	JTextField textFieldOfDecompressTo;

	// Show the status of the process
	JTextArea decompressStatusArea;

	JPanel panel1, panel2, panel3;

	DecompressJPanel() {
		init();
	}

	private void init() {
		// The panel1 contains the components which determine the file
		// decompressed
		JLabel label1 = new JLabel("Choose source:");
		JButton button1 = new JButton("Select...");
		
		textFieldOfDecompress = new JTextField();
		panel1 = new JPanel();
		panel1.setLayout(new BorderLayout(10, 10));
		panel1.add(label1, BorderLayout.WEST);
		panel1.add(button1, BorderLayout.EAST);
		panel1.add(textFieldOfDecompress, BorderLayout.SOUTH);

		// The panel2 contains the components which determine the folder which
		// the file is decompressed to
		JLabel label2 = new JLabel("Decompress to:");
		JButton button2 = new JButton("Decompress to...");
	
		textFieldOfDecompressTo = new JTextField();
		panel2 = new JPanel();
		panel2.setLayout(new BorderLayout(10, 10));
		panel2.add(label2, BorderLayout.WEST);
		panel2.add(button2, BorderLayout.EAST);
		panel2.add(textFieldOfDecompressTo, BorderLayout.SOUTH);

		// panel3 contains the components which are used to control the process
		// and show the status
		JLabel label7 = new JLabel("Status:");
		JButton button6 = new JButton("OK");
		panel3 = new JPanel();
		decompressStatusArea = new JTextArea();
		decompressStatusArea.setBackground(Color.LIGHT_GRAY);
		decompressStatusArea.setEditable(false);
		decompressStatusArea.setText("PREPARE TO DECOMPRESS");
		JPanel p23 = new JPanel();
		p23.setLayout(new BorderLayout(10, 10));
		p23.add(label7, BorderLayout.WEST);
		p23.add(button6, BorderLayout.EAST);
		panel3.setLayout(new BorderLayout(10, 10));
		panel3.add(p23, BorderLayout.NORTH);
		panel3.add(decompressStatusArea, BorderLayout.CENTER);

		// the actionListener for decompress Panel
		ButtonListener2 btListener2 = new ButtonListener2();
		button1.addActionListener(btListener2);
		button2.addActionListener(btListener2);
		button6.addActionListener(btListener2);

	}

	public JPanel getDefaultJPanel() {
		// construct the panel of the decompression
		JPanel p2 = new JPanel();
		p2.setLayout(new GridLayout(2, 1, 20, 20));
		p2.add(panel1);
		p2.add(panel2);
		JPanel decompressPanel = new JPanel();
		decompressPanel.setLayout(new GridLayout(2, 1, 20, 20));
		decompressPanel.add(p2);
		decompressPanel.add(panel3);
		return decompressPanel;
	}

	// 解压面的listener
	String decompressFile, decompressToFile;// The name of the 2 files

	String f2;// The path

	String fileName;

	int mode;

	private class ButtonListener2 implements ActionListener {
		public void actionPerformed(ActionEvent e) {
			if (e.getActionCommand().equals("Select...")) {
				// Get the name of the decompressed file and show the default
				// path
				mode = JFileChooser.FILES_AND_DIRECTORIES;
				if ((decompressFile = showLoad()) != null) {
					while (decompressFile.charAt(decompressFile.length() - 1) != '~') {
						JOptionPane
								.showMessageDialog(null,
										"Please choose the correct file,whose name with \'~\'");
						decompressFile = showLoad();
					}
					textFieldOfDecompress.setText(decompressFile);
					f2 = decompressFile.substring(0, decompressFile
							.lastIndexOf("~"));
					textFieldOfDecompressTo.setText(f2);
				}
			} else if (e.getActionCommand().equals("Decompress to...")) {
				// Get the path of the decompression and the name of the file
				// which is the target file
				mode = JFileChooser.DIRECTORIES_ONLY;
				if ((decompressToFile = showLoad()) != null)
					textFieldOfDecompressTo.setText(decompressToFile + "\\"
							+ fileName.substring(0, fileName.length() - 1));
			} else if (e.getActionCommand().equals("OK")) {
				try {
					// String s = textFieldOfDecompressTo.getText();
					long start = System.currentTimeMillis();
					new logical.Decompression(textFieldOfDecompress.getText(),
							textFieldOfDecompressTo.getText());
					long end = System.currentTimeMillis();
					decompressStatusArea.setText("DECOMPRESS DONE!\n"
							+ "DECOMPRESS TIME IS " + (end - start) + "Millis");
				} catch (Exception ex) {
				}
				;
			}
		}
	}

	// Show the choices
	private String showLoad() {
		JFileChooser file = new JFileChooser();
		file.setFileSelectionMode(mode);
		file.showSaveDialog(new JPanel());
		File result = file.getSelectedFile();
		if (mode == JFileChooser.FILES_AND_DIRECTORIES)
			fileName = result.getName();
		return result.getPath();
	}
}