filedes.java

DES的java代码,有界面,好用,是个很好的学习的例子

package DES;
import DES.mmsSecDilog;
import java.awt.BorderLayout;
import java.awt.ComponentOrientation;
import java.awt.Font;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

import javax.swing.JButton;

import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import com.jgoodies.forms.layout.FormLayout;


public class fileDES extends JDialog {

	private JButton button_4;
	/**
	 * Launch the application
	 * @param args
	 */
	private static final boolean enc=true;    //加密
	private static final boolean dec=false;	  //解密
	private final String passWord="1234ABCD";
	
	private  static final fileDES dialog = new fileDES();
	
	String srcFileName;
	private String destFileName;
	private String dirName;
	private String desdirName;
	private String filerealname;
	private String inKey;
	private boolean actionType;
	private File srcFile;
	private File destFile;
    private Des des;
	protected  mmsSecDilog frame1;
	
	public static fileDES getfileDES()
	{
		return dialog;
	}
	
	private void analyzePath(){
		
		File dir=new File(dirName);
		if (!dir.exists()){
			System.err.println(dirName+" is not exist");
			System.exit(1);
		}else if(!dir.isDirectory()){
			System.err.println(dirName+" is not a directory");
			System.exit(1);
		}
		dir=new File(desdirName);
		if (!dir.exists()){
			if(!dir.mkdirs()){
				System.out.println ("can not creat directory:"+desdirName);
				System.exit(1);
			}
		}else if(!dir.isDirectory()){
			System.err.println(desdirName+" is not a directory");
			System.exit(1);
		}
	}
	
	private static int replenish(FileChannel channel,ByteBuffer buf) throws IOException{
		long byteLeft=channel.size()-channel.position();
		if(byteLeft==0L)
			return -1;
		buf.position(0);
		buf.limit(buf.position()+(byteLeft<8 ? (int)byteLeft :8));
		return channel.read(buf);
	}
	
	private void file_operate(boolean flag){
		des=new Des(inKey);
		FileOutputStream outputFile=null;
		try {
			outputFile=new FileOutputStream(srcFile,true);
	    }catch (java.io.FileNotFoundException e) {
	    	e.printStackTrace(System.err);
	    }
	    FileChannel outChannel=outputFile.getChannel();
	    
	    try{
		    if(outChannel.size()%2!=0){
				ByteBuffer bufTemp=ByteBuffer.allocate(1);
				bufTemp.put((byte)32);
				bufTemp.flip();			
				outChannel.position(outChannel.size());
				outChannel.write(bufTemp);
		    	bufTemp.clear();		
			}
		}catch(Exception ex){
			ex.printStackTrace(System.err);
			System.exit(1);
		}
		FileInputStream inFile=null;
		try{
			inFile=new FileInputStream(srcFile);
		}catch(java.io.FileNotFoundException e){
			e.printStackTrace(System.err);
			//System.exit(1);
		}
		outputFile=null;
		try {
			outputFile=new FileOutputStream(destFile,true);
	    }catch (java.io.FileNotFoundException e) {
	    	e.printStackTrace(System.err);
	    }
	    
	    FileChannel inChannel=inFile.getChannel();
		outChannel=outputFile.getChannel();
		
		
		ByteBuffer inBuf=ByteBuffer.allocate(8);
		ByteBuffer outBuf=ByteBuffer.allocate(8);
		
		try{
			String srcStr;
			String destStr;
			while(true){
			
				if (replenish(inChannel,inBuf)==-1) break;
				srcStr=((ByteBuffer)(inBuf.flip())).asCharBuffer().toString();
				inBuf.clear();
				if (flag)
					destStr=des.enc(srcStr,srcStr.length());
				else
					destStr=des.dec(srcStr,srcStr.length());
			    outBuf.clear();
			    if (destStr.length()==4){
			    	for (int i = 0; i<4; i++) {
	    				outBuf.putChar(destStr.charAt(i));
	    			}
			    	outBuf.flip();
			    }else{
			    	outBuf.position(0);
			    	outBuf.limit(2*destStr.length());
			    	for (int i = 0; i<destStr.length(); i++) {
	    				outBuf.putChar(destStr.charAt(i));
	    			}
			    	outBuf.flip();
			    }
			    
			    try {
	    			outChannel.write(outBuf);
	    			outBuf.clear();
	    		}catch (java.io.IOException ex) {
	    			ex.printStackTrace(System.err);
	    		}
			}
			System.out.println (inChannel.size());
	    	System.out.println (outChannel.size());
			System.out.println ("EoF reached.");
			inFile.close();
			outputFile.close();
		}catch(java.io.IOException e){
			e.printStackTrace(System.err);
			System.exit(1);
		}	
	}
	
	public void FileDES(String srcFileName,String destFileName,String inKey,boolean actionType){
		this.srcFileName=srcFileName;
		this.destFileName=destFileName;		
		this.actionType=actionType;
		analyzePath();
		srcFile=new File(srcFileName);
		destFile=new File(destFileName);		
		this.inKey=inKey;
		if (actionType==enc)
			file_operate(enc);
		else
			file_operate(dec);
	}
	
	public static void main(String args[]) {
		try {
			
			dialog.addWindowListener(new WindowAdapter() {
				public void windowClosing(WindowEvent e) {
					System.exit(0);
				}
			});
			dialog.setVisible(true);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Create the dialog
	 */
	public fileDES() {
		super();
		setSize(500, 300);
		getContentPane().setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
		
		final JLabel label = new JLabel();
		label.setHorizontalAlignment(SwingConstants.CENTER);
		label.setFont(new Font("@楷体_GB2312", Font.PLAIN, 20));
		label.setLayout(new FormLayout("492px", "341px"));
		label.setBounds(new Rectangle(100, 100, 500, 375));
		label.setText("DES加密");
		getContentPane().add(label, BorderLayout.BEFORE_FIRST_LINE);

		final JButton button_1 = new JButton();
		button_1.addMouseListener(new MouseAdapter() {
			public void mouseClicked(final MouseEvent arg0) {
				mmsSecDilog frame1=new mmsSecDilog(dialog);
	            frame1.setTitle("请选择要加密的文件");
	           	frame1.setSize(550,350);    
	           	frame1.setVisible(true);
	            //System.out.println(dialog.srcFileName);
         }
		});
		button_1.setFont(new Font("楷体_GB2312", Font.PLAIN, 18));
	    button_1.setBounds(new Rectangle(100, 100, 500, 375));
		button_1.setText("打开加密文件");
		getContentPane().add(button_1, BorderLayout.WEST);

		final JButton button_2 = new JButton();
		button_2.addMouseListener(new MouseAdapter() {

			public void mouseClicked(final MouseEvent arg0) {
	           	  
				System.out.println(dialog.srcFileName);
		        int pos=srcFileName.lastIndexOf("\\");
				dirName=srcFileName.substring(0,pos);
				System.out.println(dirName);
				filerealname = srcFileName.substring(srcFileName.lastIndexOf("\\") + 1);
				System.out.println(filerealname);
				StringBuffer dest=new StringBuffer();
                dest.append(dirName);
                dest.append("\\");
                dest.append("DES");
                dest.append(filerealname);
                destFileName=dest.toString();
                System.out.println(destFileName);
                pos=destFileName.lastIndexOf("\\");
				desdirName=destFileName.substring(0,pos);
	           	  FileDES(srcFileName,destFileName,passWord,true);
			}
		});
		button_2.setFont(new Font("楷体_GB2312", Font.PLAIN, 18));
		button_2.setText("加密");
		getContentPane().add(button_2, BorderLayout.CENTER);

		final JButton button_3 = new JButton();
		button_3.addMouseListener(new MouseAdapter() {
			public void mouseClicked(final MouseEvent arg0) {
				mmsSecDilog frame1=new mmsSecDilog(dialog);
	            frame1.setTitle("请选择要解密的文件");
	           	frame1.setSize(550,350);    
	           	frame1.setVisible(true);
			}
		});
		button_3.setFont(new Font("楷体_GB2312", Font.PLAIN, 18));
		button_3.setText("打开解密文件");
		getContentPane().add(button_3, BorderLayout.EAST);

		final JButton button_4 = new JButton();
		button_4.addMouseListener(new MouseAdapter() {
			public void mouseClicked(final MouseEvent arg0) {
				System.out.println(dialog.srcFileName);
		        int pos=srcFileName.lastIndexOf("\\");
		        dirName=srcFileName.substring(0,pos);
				System.out.println(dirName);
				System.out.println(desdirName);
				filerealname = srcFileName.substring(srcFileName.lastIndexOf("\\") + 1);
				System.out.println(filerealname);
				StringBuffer dest=new StringBuffer();
                dest.append(dirName);
                dest.append("\\");
                dest.append("ENY");
                dest.append(filerealname);
                destFileName=dest.toString();
                pos=destFileName.lastIndexOf("\\");
		        desdirName=destFileName.substring(0,pos);
				 FileDES(srcFileName,destFileName,passWord,false);	
			}	
		});
		button_4.setFont(new Font("楷体_GB2312", Font.PLAIN, 18));
		button_4.setText("解密");
		getContentPane().add(button_4, BorderLayout.SOUTH);
		
	}

}