import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.filechooser.*;
public class FileChooserDemo extends JPanel
implements ActionListener {
static private final String newline = "\n";
JButton openButton, saveButton;
JTextArea log;
JFileChooser fc;
public FileChooserDemo() {
super(new BorderLayout());
//Create the log first, because the action listeners
//need to refer to it.
log = new JTextArea(5,20);
log.setMargin(new Insets(5,5,5,5));
log.setEditable(false);
JScrollPane logScrollPane = new JScrollPane(log);
//Create a file chooser
fc = new JFileChooser();
//Uncomment one of the following lines to try a different
//file selection mode. The first allows just directories
//to be selected (and, at least in the Java look and feel,
//shown). The second allows both files and directories
//to be selected. If you leave these lines commented out,
//then the default mode (FILES_ONLY) will be used.
//
//fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
//fc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
//Create the open button. We use the image from the JLF
//Graphics Repository (but we extracted it from the jar).
openButton = new JButton("压缩文件...",
createImageIcon("images/Open16.gif"));
openButton.addActionListener(this);
//Create the save button. We use the image from the JLF
//Graphics Repository (but we extracted it from the jar).
saveButton = new JButton("解压文件...",
createImageIcon("images/Save16.gif"));
saveButton.addActionListener(this);
//For layout purposes, put the buttons in a separate panel
JPanel buttonPanel = new JPanel(); //use FlowLayout
buttonPanel.add(openButton);
buttonPanel.add(saveButton);
//Add the buttons and the log to this panel.
add(buttonPanel, BorderLayout.PAGE_START);
add(logScrollPane, BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent e) {
//Handle open button action.
if (e.getSource() == openButton) {
int returnVal = fc.showOpenDialog(FileChooserDemo.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
//This is where a real application would open the file.
log.append("正压缩文件: " + file.getAbsolutePath() + newline);
try {
Hzip.compress(file.getAbsolutePath());
log.append("已完成压缩: " + file.getAbsolutePath()+".huf" + newline);
} catch (IOException error) {
// TODO Auto-generated catch block
error.printStackTrace();
log.append("错误:"+error.getMessage());
}
} else {
//log.append("Open command cancelled by user." + newline);
}
log.setCaretPosition(log.getDocument().getLength());
//Handle save button action.
} else if (e.getSource() == saveButton) {
int returnVal = fc.showSaveDialog(FileChooserDemo.this);
if (returnVal == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
//This is where a real application would save the file.
log.append("解压: " + file.getAbsolutePath() + "" + newline);
try {
Hzip.uncompress(file.getAbsolutePath());
log.append("已完成解压: " + file.getAbsolutePath().substring(0, file.getAbsolutePath().length()-4)+ newline);
} catch (IOException error) {
// TODO Auto-generated catch block
error.printStackTrace();
log.append("错误:"+error.getMessage());
}
} else {
// log.append("Save command cancelled by user." + newline);
}
log.setCaretPosition(log.getDocument().getLength());
}
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = FileChooserDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event dispatch thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("文件Huffman压缩与解压!");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Add content to the window.
frame.add(new FileChooserDemo());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event dispatch thread:
//creating and showing this application's GUI.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
//Turn off metal's use of bold fonts
UIManager.put("swing.boldMetal", Boolean.FALSE);
createAndShowGUI();
}
});
}
}
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mport java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import java.util.PriorityQueue; import java.io.*; public class HuffmanTree { public long charCountSum; private CharCounter theCounts;//字节计数器 //存放哈夫曼树的所有节点,字节i对应的节点是theOndes[i] private HuffNode [ ] theNodes = new HuffNode[ BitUtils.DIFF_BYTES + 1 ];//256+1 private HuffNode root;//哈夫曼树的根节点 public HuffmanTree( ) { theCounts = new CharCounter( ); root = null; }
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7fee4e96-2168-35cf-88b7-e6918b4814e3.zip (9个子文件)
CharCounter.java 873B
FileChooserDemo.java 5KB
HZIPOutputStream.java 42B
BitInputStream.java 2KB
HuffNode.java 492B
BitOutputStream.java 4KB
Hzip.java 4KB
HuffmanTree.java 5KB
BitUtils.java 172B
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