import java.awt.*;
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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
說明:文件加密
加密方法:三重DES加密
加密過程:對選中的文件加密后在同文件夾下生成一個增加了".tdes"
擴展名的加密文件
解密過程:對選中的加密文件(必須有".tdes"擴展名)進行解密
*/
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("文件選擇");
c.add(fp);
final KeyPanel pp = new KeyPanel("密碼");
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,"請選擇文件!","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,"請選擇文件!","提示",JOptionPane.OK_OPTION);
}
});
}
/**
加密函數(shù)
輸入:
要加密的文件,密碼(由0-F組成,共48個字符,表示3個8位的密碼)如:
AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
其中:
AD67EA2F3BE6E5AD DES密碼一
D368DFE03120B5DF DES密碼二
92A8FD8FEC2F0746 DES密碼三
輸出:
對輸入的文件加密后,保存到同一文件夾下增加了".tdes"擴展名的文件中。
*/
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 = 0;iFILEIN.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 = 0;iBYTOUT.LENGTH;I++){
fos.write((int)bytOut[i]);
}
fos.close();
JOptionPane.showMessageDialog(
this,"加密成功!","提示",JOptionPane.OK_OPTION);
}else
JOptionPane.showMessageDialog(
this,"密碼長度必須等于48!","錯誤信息",JOptionPane.ERROR_MESSAGE);
}catch(Exception e){
e.printStackTrace();
}
}
/**
解密函數(shù)
輸入:
要解密的文件,密碼(由0-F組成,共48個字符,表示3個8位的密碼)如:
AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
其中:
AD67EA2F3BE6E5AD DES密碼一
D368DFE03120B5DF DES密碼二
92A8FD8FEC2F0746 DES密碼三
輸出:
對輸入的文件解密后,保存到用戶指定的文件中。
*/
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));
//用戶指定要保存的文件
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 = 0;iFILEIN.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 = 0;iBYTOUT.LENGTH;I++){
fos.write((int)bytOut[i]);
}
fos.close();
JOptionPane.showMessageDialog(
this,"解密成功!","提示",JOptionPane.OK_OPTION);
}
}else
JOptionPane.showMessageDialog(
this,"密碼長度必須等于48!","錯誤信息",JOptionPane.ERROR_MESSAGE);
}catch(Exception e){
JOptionPane.showMessageDialog(
this,"解密失敗,請核對密碼!","提示",JOptionPane.OK_OPTION);
}
}
/**
用DES方法加密輸入的字節(jié)
bytKey需為8字節(jié)長,是加密的密碼
*/
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方法解密輸入的字節(jié)
bytKey需為8字節(jié)長,是解密的密碼
*/
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);
}
/**
輸入密碼的字符形式,返回字節(jié)數(shù)組形式。
如輸入字符串:AD67EA2F3BE6E5AD
返回字節(jié)數(shù)組:{173,103,234,47,59,230,229,173}
*/
private byte[] getKeyByStr(String str){
byte[] bRet = new byte[str.length()/2];
for(int i=0;iSTR.LENGTH()
Integer itg =
new Integer(16*getChrInt(str.charAt(2*i)) + getChrInt(str.charAt(2*i+1)));
bRet[i] = itg.byteValue();
}
return bRet;
}
/**
計算一個16進制字符的10進制值
輸入: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;
}
}
/**
文件選擇組件。
*/
class FilePanel extends JPanel{
FilePanel(String str){
JLabel label = new JLabel(str);
JTextField fileText = new JTextField(35);
JButton chooseButton = new JButton("瀏覽...");
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;
}
}
/**
密碼生成組件。
*/
class KeyPanel extends JPanel{
KeyPanel(String str){
JLabel label = new JLabel(str);
JTextField fileText = new JTextField(35);
JButton chooseButton = new JButton("隨機產(chǎn)生");
this.add(label);
this.add(fileText);
this.add(chooseButton);
clickAction ca = new clickAction(this);
chooseButton.addActionListener(ca);
}
//返回生成的密碼(48個字符長度)
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=0;iBYT.LENGTH;I++){
//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;
}
}
密碼文本框用JPasswordField,輸入內(nèi)容自動為*號,當(dāng)然可以轉(zhuǎn)換成●或其他
JTextField jtf=new JTextField();
String str=jtf.getText().trim();//密碼字符串
JOptionPane.showConfirmDialo(this,jtf ,"輸入密碼",JOptionPane.OK_CANCEL_OPTION );
if(str.length!=6){
JOptionPane.showMessageDialog(this,"請輸入6位密碼");
}
//直接打的,可能有錯誤
在JSP中確定密碼是否相同的方法是通過js實現(xiàn)的。
將onchange事件添加到兩個文本框中,并在文本框的內(nèi)容發(fā)生更改時觸發(fā)事件,并在此事件中寫入判斷。
下面是步驟:
公共DOCTYPE HTML”- / / / / W3C XHTML 1.0 DTD過渡/ / EN " " "
HTML XMLNS = " "
頭
meta HTTP - equiv =“Content -type”內(nèi)容=“文本/HTML”。Charset = gb2312 "/ 。
script type = "text/javascript" 。
函數(shù)checkpwd () {
Var p1 =文檔。Form1。Pwd1。價值;//獲取密碼框的值。
Var p2 =文檔。Form1。Pwd2。價值;//獲取重新輸入的密碼值。
{if (p1 = = ")
警告(“請輸入您的密碼!”);//密碼被檢測為空,輸入//被記錄。
文檔。Form1。Pwd1。關(guān)注();//專注于密碼框。
返回錯誤;//退出檢測功能。
}//如果允許一個空密碼,此條件可以被撤銷。
如果(p1 !=p2){//確定輸入值是否相同,并顯示錯誤消息。
文檔。GetElementByIdx_x(“味精”)。InnerHTML =“兩個輸入密碼不一致,請重新輸入”;//在div中顯示錯誤消息。
返回錯誤;
密碼是一樣的,你可以繼續(xù)下一步。
form name = "form1" 。
代碼:
確認(rèn)密碼:——onchange事件觸發(fā)檢測——。
div id = "MSG" style = "color: red " / div 。
/形式
The / body 。
/ HTML 。
passwordField = new JPasswordField();
passwordField.setForeground(Color.BLACK); //設(shè)置輸入的字的顏色
passwordField.setEchoChar('*');
passwordField.setOpaque(false); //透明框
passwordField.setBounds(128, 189, 104, 21); //(空白框在窗體中x軸的位置,空白框在窗體中y軸的位置,空白框的寬,空白框的高)
contentPane.add(passwordField); //加入設(shè)置面板中