huffgui.java

huffman字符编码的java实现

package Huffman;

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

public class HuffGUI extends JFrame{
	private File infile,outfile;
	private JLabel inLabel,outLabel;
	private JTextField inField,outField;
	private JButton openButton,enterButton;
	private ButtonGroup radioGroup;
	private JRadioButton compressButton,decompressButton;
	private Boolean compress=true;
	
	public HuffGUI () 
	{		
		super("Huffman");
      	JPanel inPanel=new JPanel();
      	JPanel outPanel=new JPanel();
      	JPanel processPanel=new JPanel();
      	Box box = Box.createVerticalBox();
		inLabel=new JLabel("Input:");
		outLabel=new JLabel("Output:");
		inField=new JTextField(20);
		outField=new JTextField(20);
		openButton=new JButton ();
		openButton.setText("...");
		openButton.addActionListener(
			new ActionListener()
			{
				public void actionPerformed(ActionEvent event)
				{
					openFile();
				}
			}
		);
		
		enterButton=new JButton("Process");
		
		enterButton.addActionListener(
			new ActionListener()
			{
				public void actionPerformed(ActionEvent event)
				{
					process();
				}
			}
		);
		
		
		inPanel.add(inLabel);
		inPanel.add(inField);
		inPanel.add(openButton);
		outPanel.add(outLabel);
		outPanel.add(outField);

		
		compressButton=new JRadioButton("Compress",true);
		compressButton.addItemListener(new RadioButtonHandler());
		
		decompressButton=new JRadioButton("Decompress",false);
		decompressButton.addItemListener(new RadioButtonHandler());
		
		radioGroup=new ButtonGroup();
		radioGroup.add(compressButton);
		radioGroup.add(decompressButton);
		processPanel.add(compressButton);
		processPanel.add(decompressButton);
		processPanel.add(enterButton);
		
		box.add(inPanel);
		box.add(outPanel);
		
		box.add(processPanel);
		this.add(box);
		
		this.setLocation(100,200);
		setSize(400,200);
		setVisible(true); 
	}
    
    private class RadioButtonHandler implements ItemListener{
    	public void itemStateChanged(ItemEvent event)
    	{
    		if(event.getSource()==decompressButton)
    		compress=false;
    		else 
    		compress=true;
    	}
    }	  
	
	private void openFile(){
		JFileChooser fileChooser=new JFileChooser();
		fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
		int result=fileChooser.showOpenDialog(this);
		if(result==JFileChooser.CANCEL_OPTION)
		return;
		infile=fileChooser.getSelectedFile();
		if(infile==null||infile.getName().equals(""))
		{
			JOptionPane.showMessageDialog(this,"Invalid File Name","Invalid File Name",
			JOptionPane.ERROR_MESSAGE);
			return ;
			}
		inField.setText(infile.getName());
	
	}
	
	private void process() {
		outfile=new File(outField.getText());
		if(outfile==null||outfile.getName().equals(""))
		{
			JOptionPane.showMessageDialog(this,"Invalid File Name","Invalid File Name",
			JOptionPane.ERROR_MESSAGE);
			return ;
		}
	
		
		if(compress==false)
		{
			Decompress c=new Decompress(infile,outfile);
			c.process();
			JOptionPane.showMessageDialog(this,"Decompress OK","Result",
			JOptionPane.INFORMATION_MESSAGE);
			return;
		}
		
		else{
			Compress c=new Compress(infile,outfile);
			c.process();
			JOptionPane.showMessageDialog(this,"Compress OK","Result",
			JOptionPane.INFORMATION_MESSAGE);
			return;
		} 
		
	}
	
	public static void main(String [] args)
	{
		HuffGUI g=new HuffGUI();
		g.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}	
}