import java.awt.*
import java.awt.event.*
import javax.swing.*
import java.io.*
import java.security.*
import javax.crypto.*
import javax.crypto.spec.*
/**
文件名：FileEncrypter.java
JDK：1.40以上
说明：文件加密
加密方法：三重DES加密
加密过程：对选中的文件加密后在同文件夹下生成一个增加了".tdes"
扩展名的加密文件
解密过程：对选中的加密文件（必须有".tdes"扩展名）进行解密
*/
public class FileEncrypter extends JFrame{
public static final int WIDTH = 550
public static final int HEIGHT = 200
public static void main(String args[]) {
FileEncrypter fe = new FileEncrypter()
fe.show()
}
FileEncrypter(){
this.setSize(WIDTH,HEIGHT)
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
this.setResizable(false)
Toolkit tk = Toolkit.getDefaultToolkit()
Dimension screenSize = tk.getScreenSize()
this.setLocation((screenSize.width - WIDTH)/2,
(screenSize.height - HEIGHT)/2)
this.setTitle("文件加密器(TriDES)")
Container c = this.getContentPane()
c.setLayout( new FlowLayout())
final FilePanel fp = new FilePanel("文件选择")
c.add(fp)
final KeyPanel pp = new KeyPanel("密码")
c.add(pp)
JButton jbE = new JButton("加密")
c.add(jbE)
jbE.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
File file = new File(fp.getFileName())
if (file.exists())
encrypt(file.getAbsoluteFile(),pp.getKey())
else
JOptionPane.showMessageDialog(
null,"请选择文件！","提示",JOptionPane.OK_OPTION)
}
})
JButton jbD = new JButton("解密")
c.add(jbD)
jbD.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
File file = new File(fp.getFileName())
if (file.exists())
decrypt(file.getAbsoluteFile(),pp.getKey())
else
JOptionPane.showMessageDialog(
null,"请选择文件！","提示",JOptionPane.OK_OPTION)
}
})
}
/**
加密函数
输入：
要加密的文件，密码（由0-F组成，共48个字符，表示3个8位的密码）如：
AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
其中：
AD67EA2F3BE6E5AD DES密码一
D368DFE03120B5DF DES密码二
92A8FD8FEC2F0746 DES密码三
输出：
对输入的文件加密后，保存到同一文件夹下增加了".tdes"扩展名的文件中。
*/
private void encrypt(File fileIn,String sKey){
try{
if(sKey.length() == 48){
byte[] bytK1 = getKeyByStr(sKey.substring(0,16))
byte[] bytK2 = getKeyByStr(sKey.substring(16,32))
byte[] bytK3 = getKeyByStr(sKey.substring(32,48))
FileInputStream fis = new FileInputStream(fileIn)
byte[] bytIn = new byte[(int)fileIn.length()]
for(int i = 0i<fileIn.length()i++){
bytIn[i] = (byte)fis.read()
}
//加密
byte[] bytOut = encryptByDES(encryptByDES(
encryptByDES(bytIn,bytK1),bytK2),bytK3)
String fileOut = fileIn.getPath() + ".tdes"
FileOutputStream fos = new FileOutputStream(fileOut)
for(int i = 0i<bytOut.lengthi++){
fos.write((int)bytOut[i])
}
fos.close()
JOptionPane.showMessageDialog(
this,"加密成功！","提示",JOptionPane.OK_OPTION)
}else
JOptionPane.showMessageDialog(
this,"密码长度必须等于48！","错误信息",JOptionPane.ERROR_MESSAGE)
}catch(Exception e){
e.printStackTrace()
}
}
/**
解密函数
输入：
要解密的文件，密码（由0-F组成，共48个字符，表示3个8位的密码）如：
AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
其中：
AD67EA2F3BE6E5AD DES密码一
D368DFE03120B5DF DES密码二
92A8FD8FEC2F0746 DES密码三
输出：
对输入的文件解密后，保存到用户指定的文件中。
*/
private void decrypt(File fileIn,String sKey){
try{
if(sKey.length() == 48){
String strPath = fileIn.getPath()
if(strPath.substring(strPath.length()-5).toLowerCase().equals(".tdes"))
strPath = strPath.substring(0,strPath.length()-5)
else{
JOptionPane.showMessageDialog(
this,"不是合法的加密文件！","提示",JOptionPane.OK_OPTION)
return
}
JFileChooser chooser = new JFileChooser()
chooser.setCurrentDirectory(new File("."))
chooser.setSelectedFile(new File(strPath))
//用户指定要保存的文件
int ret = chooser.showSaveDialog(this)
if(ret==JFileChooser.APPROVE_OPTION){
byte[] bytK1 = getKeyByStr(sKey.substring(0,16))
byte[] bytK2 = getKeyByStr(sKey.substring(16,32))
byte[] bytK3 = getKeyByStr(sKey.substring(32,48))
FileInputStream fis = new FileInputStream(fileIn)
byte[] bytIn = new byte[(int)fileIn.length()]
for(int i = 0i<fileIn.length()i++){
bytIn[i] = (byte)fis.read()
}
//解密
byte[] bytOut = decryptByDES(decryptByDES(
decryptByDES(bytIn,bytK3),bytK2),bytK1)
File fileOut = chooser.getSelectedFile()
fileOut.createNewFile()
FileOutputStream fos = new FileOutputStream(fileOut)
for(int i = 0i<bytOut.lengthi++){
fos.write((int)bytOut[i])
}
fos.close()
JOptionPane.showMessageDialog(
this,"解密成功！","提示",JOptionPane.OK_OPTION)
}
}else
JOptionPane.showMessageDialog(
this,"密码长度必须等于48！","错误信息",JOptionPane.ERROR_MESSAGE)
}catch(Exception e){
JOptionPane.showMessageDialog(
this,"解密失败，请核对密码！","提示",JOptionPane.OK_OPTION)
}
}
/**
用DES方法加密输入的字节
bytKey需为8字节长，是加密的密码
*/
private byte[] encryptByDES(byte[] bytP,byte[] bytKey) throws Exception{
DESKeySpec desKS = new DESKeySpec(bytKey)
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES")
SecretKey sk = skf.generateSecret(desKS)
Cipher cip = Cipher.getInstance("DES")
cip.init(Cipher.ENCRYPT_MODE,sk)
return cip.doFinal(bytP)
}
/**
用DES方法解密输入的字节
bytKey需为8字节长，是解密的密码
*/
private byte[] decryptByDES(byte[] bytE,byte[] bytKey) throws Exception{
DESKeySpec desKS = new DESKeySpec(bytKey)
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES")
SecretKey sk = skf.generateSecret(desKS)
Cipher cip = Cipher.getInstance("DES")
cip.init(Cipher.DECRYPT_MODE,sk)
return cip.doFinal(bytE)
}
/**
输入密码的字符形式，返回字节数组形式。
如输入字符串：AD67EA2F3BE6E5AD
返回字节数组：{ 173,103,234,47,59,230,229,173 }
*/
private byte[] getKeyByStr(String str){
byte[] bRet = new byte[str.length()/2]
for(int i=0i<str.length()/2i++){
Integer itg =
new Integer(16*getChrInt(str.charAt(2*i)) + getChrInt(str.charAt(2*i+1)))
bRet[i] = itg.byteValue()
}
return bRet
}
/**
计算一个16进制字符的10进制值
输入：0-F
*/
private int getChrInt(char chr){
int iRet=0
if(chr=="0".charAt(0)) iRet = 0
if(chr=="1".charAt(0)) iRet = 1
if(chr=="2".charAt(0)) iRet = 2
if(chr=="3".charAt(0)) iRet = 3
if(chr=="4".charAt(0)) iRet = 4
if(chr=="5".charAt(0)) iRet = 5
if(chr=="6".charAt(0)) iRet = 6
if(chr=="7".charAt(0)) iRet = 7
if(chr=="8".charAt(0)) iRet = 8
if(chr=="9".charAt(0)) iRet = 9
if(chr=="A".charAt(0)) iRet = 10
if(chr=="B".charAt(0)) iRet = 11
if(chr=="C".charAt(0)) iRet = 12
if(chr=="D".charAt(0)) iRet = 13
if(chr=="E".charAt(0)) iRet = 14
if(chr=="F".charAt(0)) iRet = 15
return iRet
}
}
/**
文件选择组件。
*/
class FilePanel extends JPanel{
FilePanel(String str){
JLabel label = new JLabel(str)
JTextField fileText = new JTextField(35)
JButton chooseButton = new JButton("浏览...")
this.add(label)
this.add(fileText)
this.add(chooseButton)
clickAction ca = new clickAction(this)
chooseButton.addActionListener(ca)
}
public String getFileName(){
JTextField jtf = (JTextField)this.getComponent(1)
return jtf.getText()
}
private class clickAction implements ActionListener{
clickAction(Component c){
cmpt = c
}
public void actionPerformed(ActionEvent event){
JFileChooser chooser = new JFileChooser()
chooser.setCurrentDirectory(new File("."))
int ret = chooser.showOpenDialog(cmpt)
if(ret==JFileChooser.APPROVE_OPTION){
JPanel jp = (JPanel)cmpt
JTextField jtf = (JTextField)jp.getComponent(1)
jtf.setText(chooser.getSelectedFile().getPath())
}
}
private Component cmpt
}
}
/**
密码生成组件。
*/
class KeyPanel extends JPanel{
KeyPanel(String str){
JLabel label = new JLabel(str)
JTextField fileText = new JTextField(35)
JButton chooseButton = new JButton("随机产生")
this.add(label)
this.add(fileText)
this.add(chooseButton)
clickAction ca = new clickAction(this)
chooseButton.addActionListener(ca)
}
//返回生成的密码（48个字符长度）
public String getKey(){
JTextField jtf = (JTextField)this.getComponent(1)
return jtf.getText()
}
private class clickAction implements ActionListener{
clickAction(Component c){
cmpt = c
}
public void actionPerformed(ActionEvent event){
try{
KeyGenerator kg = KeyGenerator.getInstance("DES")
kg.init(56)
Key ke = kg.generateKey()
byte[] bytK1 = ke.getEncoded()
ke = kg.generateKey()
byte[] bytK2 = ke.getEncoded()
ke = kg.generateKey()
byte[] bytK3 = ke.getEncoded()
JPanel jp = (JPanel)cmpt
JTextField jtf = (JTextField)jp.getComponent(1)
jtf.setText(getByteStr(bytK1)+getByteStr(bytK2)+getByteStr(bytK3))
}catch(Exception e){
e.printStackTrace()
}
}
private String getByteStr(byte[] byt){
String strRet = ""
for(int i=0i<byt.lengthi++){
//System.out.println(byt[i])
strRet += getHexValue((byt[i]&240)/16)
strRet += getHexValue(byt[i]&15)
}
return strRet
}
private String getHexValue(int s){
String sRet=null
switch (s){
case 0: sRet = "0"break
case 1: sRet = "1"break
case 2: sRet = "2"break
case 3: sRet = "3"break
case 4: sRet = "4"break
case 5: sRet = "5"break
case 6: sRet = "6"break
case 7: sRet = "7"break
case 8: sRet = "8"break
case 9: sRet = "9"break
case 10: sRet = "A"break
case 11: sRet = "B"break
case 12: sRet = "C"break
case 13: sRet = "D"break
case 14: sRet = "E"break
case 15: sRet = "F"
}
return sRet
}
private Component cmpt
}
}
如果你只是想实现的话 并不是没有办法的用JAVA中的 Runtime 类是可以帮你实现的 唯一条件就是你要熟悉 在CMD下你要知道用命令去隐藏。至于加密的话，不明白你要做什么样子的加密。如果你想在打开文件之前输入密码的话，那我就不知道了。import java.awt.*import java.awt.event.*
import javax.swing.*
import java.io.*
import java.security.*
import javax.crypto.*
import javax.crypto.spec.*
/**
文件名：FileEncrypter.java
JDK：1.40以上
说明：文件加密
加密方法：三重DES加密
加密过程：对选中的文件加密后在同文件夹下生成一个增加了".tdes"
扩展名的加密文件
解密过程：对选中的加密文件（必须有".tdes"扩展名）进行解密
*/
public class FileEncrypter extends JFrame{
public static final int WIDTH = 550
public static final int HEIGHT = 200
public static void main(String args[]) {
FileEncrypter fe = new FileEncrypter()
fe.show()
}
FileEncrypter(){
this.setSize(WIDTH,HEIGHT)
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
this.setResizable(false)
Toolkit tk = Toolkit.getDefaultToolkit()
Dimension screenSize = tk.getScreenSize()
this.setLocation((screenSize.width - WIDTH)/2,
(screenSize.height - HEIGHT)/2)
this.setTitle("文件加密器(TriDES)")
Container c = this.getContentPane()
c.setLayout( new FlowLayout())
final FilePanel fp = new FilePanel("文件选择")
c.add(fp)
final KeyPanel pp = new KeyPanel("密码")
c.add(pp)
JButton jbE = new JButton("加密")
c.add(jbE)
jbE.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
File file = new File(fp.getFileName())
if (file.exists())
encrypt(file.getAbsoluteFile(),pp.getKey())
else
JOptionPane.showMessageDialog(
null,"请选择文件！","提示",JOptionPane.OK_OPTION)
}
})
JButton jbD = new JButton("解密")
c.add(jbD)
jbD.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
File file = new File(fp.getFileName())
if (file.exists())
decrypt(file.getAbsoluteFile(),pp.getKey())
else
JOptionPane.showMessageDialog(
null,"请选择文件！","提示",JOptionPane.OK_OPTION)
}
})
}
/**
加密函数
输入：
要加密的文件，密码（由0-F组成，共48个字符，表示3个8位的密码）如：
AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
其中：
AD67EA2F3BE6E5AD DES密码一
D368DFE03120B5DF DES密码二
92A8FD8FEC2F0746 DES密码三
输出：
对输入的文件加密后，保存到同一文件夹下增加了".tdes"扩展名的文件中。
*/
private void encrypt(File fileIn,String sKey){
try{
if(sKey.length() == 48){
byte[] bytK1 = getKeyByStr(sKey.substring(0,16))
byte[] bytK2 = getKeyByStr(sKey.substring(16,32))
byte[] bytK3 = getKeyByStr(sKey.substring(32,48))
FileInputStream fis = new FileInputStream(fileIn)
byte[] bytIn = new byte[(int)fileIn.length()]
for(int i = 0i<FILEIN.LENGTH()I++){
bytIn[i] = (byte)fis.read()
}
//加密
byte[] bytOut = encryptByDES(encryptByDES(
encryptByDES(bytIn,bytK1),bytK2),bytK3)
String fileOut = fileIn.getPath() + ".tdes"
FileOutputStream fos = new FileOutputStream(fileOut)
for(int i = 0i<BYTOUT.LENGTHI++){
fos.write((int)bytOut[i])
}
fos.close()
JOptionPane.showMessageDialog(
this,"加密成功！","提示",JOptionPane.OK_OPTION)
}else
JOptionPane.showMessageDialog(
this,"密码长度必须等于48！","错误信息",JOptionPane.ERROR_MESSAGE)
}catch(Exception e){
e.printStackTrace()
}
}
/**
解密函数
输入：
要解密的文件，密码（由0-F组成，共48个字符，表示3个8位的密码）如：
AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
其中：
AD67EA2F3BE6E5AD DES密码一
D368DFE03120B5DF DES密码二
92A8FD8FEC2F0746 DES密码三
输出：
对输入的文件解密后，保存到用户指定的文件中。
*/
private void decrypt(File fileIn,String sKey){
try{
if(sKey.length() == 48){
String strPath = fileIn.getPath()
if(strPath.substring(strPath.length()-5).toLowerCase().equals(".tdes"))
strPath = strPath.substring(0,strPath.length()-5)
else{
JOptionPane.showMessageDialog(
this,"不是合法的加密文件！","提示",JOptionPane.OK_OPTION)
return
}
JFileChooser chooser = new JFileChooser()
chooser.setCurrentDirectory(new File("."))
chooser.setSelectedFile(new File(strPath))
//用户指定要保存的文件
int ret = chooser.showSaveDialog(this)
if(ret==JFileChooser.APPROVE_OPTION){
byte[] bytK1 = getKeyByStr(sKey.substring(0,16))
byte[] bytK2 = getKeyByStr(sKey.substring(16,32))
byte[] bytK3 = getKeyByStr(sKey.substring(32,48))
FileInputStream fis = new FileInputStream(fileIn)
byte[] bytIn = new byte[(int)fileIn.length()]
for(int i = 0i<FILEIN.LENGTH()I++){
bytIn[i] = (byte)fis.read()
}
//解密
byte[] bytOut = decryptByDES(decryptByDES(
decryptByDES(bytIn,bytK3),bytK2),bytK1)
File fileOut = chooser.getSelectedFile()
fileOut.createNewFile()
FileOutputStream fos = new FileOutputStream(fileOut)
for(int i = 0i<BYTOUT.LENGTHI++){
fos.write((int)bytOut[i])
}
fos.close()
JOptionPane.showMessageDialog(
this,"解密成功！","提示",JOptionPane.OK_OPTION)
}
}else
JOptionPane.showMessageDialog(
this,"密码长度必须等于48！","错误信息",JOptionPane.ERROR_MESSAGE)
}catch(Exception e){
JOptionPane.showMessageDialog(
this,"解密失败，请核对密码！","提示",JOptionPane.OK_OPTION)
}
}
/**
用DES方法加密输入的字节
bytKey需为8字节长，是加密的密码
*/
private byte[] encryptByDES(byte[] bytP,byte[] bytKey) throws Exception{
DESKeySpec desKS = new DESKeySpec(bytKey)
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES")
SecretKey sk = skf.generateSecret(desKS)
Cipher cip = Cipher.getInstance("DES")
cip.init(Cipher.ENCRYPT_MODE,sk)
return cip.doFinal(bytP)
}
/**
用DES方法解密输入的字节
bytKey需为8字节长，是解密的密码
*/
private byte[] decryptByDES(byte[] bytE,byte[] bytKey) throws Exception{
DESKeySpec desKS = new DESKeySpec(bytKey)
SecretKeyFactory skf = SecretKeyFactory.getInstance("DES")
SecretKey sk = skf.generateSecret(desKS)
Cipher cip = Cipher.getInstance("DES")
cip.init(Cipher.DECRYPT_MODE,sk)
return cip.doFinal(bytE)
}
/**
输入密码的字符形式，返回字节数组形式。
如输入字符串：AD67EA2F3BE6E5AD
返回字节数组：{173,103,234,47,59,230,229,173}
*/
private byte[] getKeyByStr(String str){
byte[] bRet = new byte[str.length()/2]
for(int i=0i<STR.LENGTH()
Integer itg =
new Integer(16*getChrInt(str.charAt(2*i)) + getChrInt(str.charAt(2*i+1)))
bRet[i] = itg.byteValue()
}
return bRet
}
/**
计算一个16进制字符的10进制值
输入：0-F
*/
private int getChrInt(char chr){
int iRet=0
if(chr=="0".charAt(0)) iRet = 0
if(chr=="1".charAt(0)) iRet = 1
if(chr=="2".charAt(0)) iRet = 2
if(chr=="3".charAt(0)) iRet = 3
if(chr=="4".charAt(0)) iRet = 4
if(chr=="5".charAt(0)) iRet = 5
if(chr=="6".charAt(0)) iRet = 6
if(chr=="7".charAt(0)) iRet = 7
if(chr=="8".charAt(0)) iRet = 8
if(chr=="9".charAt(0)) iRet = 9
if(chr=="A".charAt(0)) iRet = 10
if(chr=="B".charAt(0)) iRet = 11
if(chr=="C".charAt(0)) iRet = 12
if(chr=="D".charAt(0)) iRet = 13
if(chr=="E".charAt(0)) iRet = 14
if(chr=="F".charAt(0)) iRet = 15
return iRet
}
}
/**
文件选择组件。
*/
class FilePanel extends JPanel{
FilePanel(String str){
JLabel label = new JLabel(str)
JTextField fileText = new JTextField(35)
JButton chooseButton = new JButton("浏览...")
this.add(label)
this.add(fileText)
this.add(chooseButton)
clickAction ca = new clickAction(this)
chooseButton.addActionListener(ca)
}
public String getFileName(){
JTextField jtf = (JTextField)this.getComponent(1)
return jtf.getText()
}
private class clickAction implements ActionListener{
clickAction(Component c){
cmpt = c
}
public void actionPerformed(ActionEvent event){
JFileChooser chooser = new JFileChooser()
chooser.setCurrentDirectory(new File("."))
int ret = chooser.showOpenDialog(cmpt)
if(ret==JFileChooser.APPROVE_OPTION){
JPanel jp = (JPanel)cmpt
JTextField jtf = (JTextField)jp.getComponent(1)
jtf.setText(chooser.getSelectedFile().getPath())
}
}
private Component cmpt
}
}
/**
密码生成组件。
*/
class KeyPanel extends JPanel{
KeyPanel(String str){
JLabel label = new JLabel(str)
JTextField fileText = new JTextField(35)
JButton chooseButton = new JButton("随机产生")
this.add(label)
this.add(fileText)
this.add(chooseButton)
clickAction ca = new clickAction(this)
chooseButton.addActionListener(ca)
}
//返回生成的密码（48个字符长度）
public String getKey(){
JTextField jtf = (JTextField)this.getComponent(1)
return jtf.getText()
}
private class clickAction implements ActionListener{
clickAction(Component c){
cmpt = c
}
public void actionPerformed(ActionEvent event){
try{
KeyGenerator kg = KeyGenerator.getInstance("DES")
kg.init(56)
Key ke = kg.generateKey()
byte[] bytK1 = ke.getEncoded()
ke = kg.generateKey()
byte[] bytK2 = ke.getEncoded()
ke = kg.generateKey()
byte[] bytK3 = ke.getEncoded()
JPanel jp = (JPanel)cmpt
JTextField jtf = (JTextField)jp.getComponent(1)
jtf.setText(getByteStr(bytK1)+getByteStr(bytK2)+getByteStr(bytK3))
}catch(Exception e){
e.printStackTrace()
}
}
private String getByteStr(byte[] byt){
String strRet = ""
for(int i=0i<BYT.LENGTHI++){
//System.out.println(byt[i])
strRet += getHexValue((byt[i]&240)/16)
strRet += getHexValue(byt[i]&15)
}
return strRet
}
private String getHexValue(int s){
String sRet=null
switch (s){
case 0: sRet = "0"break
case 1: sRet = "1"break
case 2: sRet = "2"break
case 3: sRet = "3"break
case 4: sRet = "4"break
case 5: sRet = "5"break
case 6: sRet = "6"break
case 7: sRet = "7"break
case 8: sRet = "8"break
case 9: sRet = "9"break
case 10: sRet = "A"break
case 11: sRet = "B"break
case 12: sRet = "C"break
case 13: sRet = "D"break
case 14: sRet = "E"break
case 15: sRet = "F"
}
return sRet
}
private Component cmpt
}
}
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