Go语言视频零基础入门到精通

javalearner

1. import java.awt.*;
2. 
   
3. import java.awt.event.*;
4. 
   
5. import javax.swing.*;
6. 
   
7. import java.io.*;
8. 
   
9. import java.security.*;
   
11. 
    
12. import javax.crypto.*;
13. 
    
14. import javax.crypto.spec.*;
15. 
    
17. 
    
18. /**
    
19. 文件名：FileEncrypter.java
    
20. JDK：1.40以上
    
22. 
    
23.    *说明：文件加密
    
24. 加密方法：三重DES加密
    
26. 
    
27.    *加密过程：
    
28. 对选中的文件加密后在同文件夹下生成一个
29. 
    
30.    *增加了".tdes" 扩展名的加密文件
31. 
    
32.    *解密过程：对选中的加密文件（必须有".tdes"扩展名）进行解密
33. 
    
34.    */
35. 
    
37. public class FileEncrypter extends JFrame{
38. public static final int WIDTH = 550;
39. public static final int HEIGHT = 200;
40. public static void main(String args[]) {
41.    FileEncrypter fe = new FileEncrypter(); fe.show();
42. }                       

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1. 
   
2. FileEncrypter(){
   
3.   this.setSize(WIDTH,HEIGHT);
   
4.   this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   
5.   this.setResizable(false);
   
6.   Toolkit tk = Toolkit.getDefaultToolkit();
   
7.   Dimension screenSize = tk.getScreenSize();
   
8.   this.setLocation((screenSize.width - WIDTH)/2, (screenSize.height - HEIGHT)/2);
   
9.   this.setTitle("文件加密器(TriDES)");
   
10.   Container c = this.getContentPane();
    
11.   c.setLayout( new FlowLayout());
    
12.   final FilePanel fp = new FilePanel("文件选择");
    
13.   c.add(fp);
    
14.   final KeyPanel pp = new KeyPanel("密码");
    
15.   c.add(pp);
    
16.   JButton jbE = new JButton("加密");
    
17.   c.add(jbE);
    
18.   jbE.addActionListener(new ActionListener(){
    
19.   public void actionPerformed(ActionEvent event){
    
20.   File file = new File(fp.getFileName());
    
21.   if (file.exists())
    
22.     encrypt(file.getAbsoluteFile(),pp.getKey());
    
23.   else
    
24.     JOptionPane.showMessageDialog(
    
25.   null,"请选择文件！","提示",JOptionPane.OK_OPTION);
    
26. }
    
27. });
    
28.   JButton jbD = new JButton("解密");
    
29.   c.add(jbD);
    
30.   jbD.addActionListener(new ActionListener(){
    
31.     public void actionPerformed(ActionEvent event){
    
32.      File file = new File(fp.getFileName());
    
33.      if (file.exists())
    
34.       decrypt(file.getAbsoluteFile(),pp.getKey());
    
35.      else
    
36.       JOptionPane.showMessageDialog(null,"请选择文件！","提示",JOptionPane.OK_OPTION);
    
37.    }
    
38.   });
    
39. }
    
40. /**
    
41. 加密函数
    
42. 输入：
    
43. 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：
    
44. AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
    
45. 其中：
    
46. AD67EA2F3BE6E5AD DES密码一
    
47. D368DFE03120B5DF DES密码二
    
48. 92A8FD8FEC2F0746 DES密码三
    
49. 输出：
    
50. 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。
    
51. */
    
52. private void encrypt(File fileIn,String sKey){
    
53.   try{
    
54.    if(sKey.length() == 48){
    
55.      byte[] bytK1 = getKeyByStr(sKey.substring(0,16));
    
56.      byte[] bytK2 = getKeyByStr(sKey.substring(16,32));
    
57.      byte[] bytK3 = getKeyByStr(sKey.substring(32,48));
    
58.      FileInputStream fis = new FileInputStream(fileIn);
    
59.      byte[] bytIn = new byte[(int)fileIn.length()];
    
60.      for(int i = 0;i< fileIn.length();i++){
    
61.       bytIn[i] = (byte)fis.read();
    
62.      }
    
63.     //加密
    
64.     byte[] bytOut = encryptByDES(encryptByDES(encryptByDES(bytIn,bytK1),bytK2),bytK3);
    
65.     String fileOut = fileIn.getPath() + ".tdes";
    
66.     FileOutputStream fos = new FileOutputStream(fileOut);
    
67.     for(int i = 0;i< bytOut.length;i++){
    
68.       fos.write((int)bytOut[i]);
    
69.     }
    
70.     fos.close();
    
71.     JOptionPane.showMessageDialog(this,"加密成功！","提示",JOptionPane.OK_OPTION);
    
72.   }else
    
73.     JOptionPane.showMessageDialog(
    
74.     this,"密码长度必须等于48！","错误信息",JOptionPane.ERROR_MESSAGE);
    
75.   }catch(Exception e){
    
76.          e.printStackTrace();
    
77.    }
    
78. }
    
79. /**
    
80. 解密函数
    
81. 输入：
    
82. 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：
    
83. AD67EA2F3BE6E5ADD368DFE03120B5DF92A8FD8FEC2F0746
    
84. 其中：
    
85. AD67EA2F3BE6E5AD DES密码一
    
86. D368DFE03120B5DF DES密码二
    
87. 92A8FD8FEC2F0746 DES密码三
    
88. 输出：
    
89. 对输入的文件解密后，保存到用户指定的文件中。
    
90. */
    
91. private void decrypt(File fileIn,String sKey){
    
92.   try{
    
93.     if(sKey.length() == 48){
    
94.       String strPath = fileIn.getPath();
    
95.       if(strPath.substring(strPath.length()-5).toLowerCase().equals(".tdes"))
    
96.         strPath = strPath.substring(0,strPath.length()-5);
    
97.       else{
    
98.         JOptionPane.showMessageDialog(this,"不是合法的加密文件！","提示",JOptionPane.OK_OPTION);
    
99.         return;
    
100.       }
     
101.       JFileChooser chooser = new JFileChooser();
     
102.       chooser.setCurrentDirectory(new File("."));
     
103.       chooser.setSelectedFile(new File(strPath));
     
104.       //用户指定要保存的文件
     
105.       int ret = chooser.showSaveDialog(this);
     
106.       if(ret==JFileChooser.APPROVE_OPTION){
     
107.         byte[] bytK1 = getKeyByStr(sKey.substring(0,16));
     
108.         byte[] bytK2 = getKeyByStr(sKey.substring(16,32));
     
109.         byte[] bytK3 = getKeyByStr(sKey.substring(32,48));
     
110.   
     
111.         FileInputStream fis = new FileInputStream(fileIn);
     
112.         byte[] bytIn = new byte[(int)fileIn.length()];
     
113.         for(int i = 0;i< fileIn.length();i++){
     
114.             bytIn[i] = (byte)fis.read();
     
115.         }
     
116.      //解密
     
117.      byte[] bytOut = decryptByDES(decryptByDES(decryptByDES(bytIn,bytK3),bytK2),bytK1);
     
118.      File fileOut = chooser.getSelectedFile();
     
119.      fileOut.createNewFile();
     
120.      FileOutputStream fos = new FileOutputStream(fileOut);
     
121.      for(int i = 0;i< bytOut.length;i++){
     
122.           fos.write((int)bytOut[i]);
     
123.       }
     
124.      fos.close();
     
125.      JOptionPane.showMessageDialog(this,"解密成功！","提示",JOptionPane.OK_OPTION);
     
126.     }
     
127.    }else
     
128.       JOptionPane.showMessageDialog(this,"密码长度必须等于48！","错误信息",JOptionPane.ERROR_MESSAGE);
     
129.   }catch(Exception e){
     
130.       JOptionPane.showMessageDialog(this,"解密失败，请核对密码！","提示",JOptionPane.OK_OPTION);
     
131.   }
     
132. }
     
133. /**
     
134. 用DES方法加密输入的字节
     
135. bytKey需为8字节长，是加密的密码
     
136. */
     
137. private byte[] encryptByDES(byte[] bytP,byte[] bytKey) throws Exception{
     
138.    DESKeySpec desKS = new DESKeySpec(bytKey);
     
139.    SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
     
140.    SecretKey sk = skf.generateSecret(desKS);
     
141.    Cipher cip = Cipher.getInstance("DES");
     
142.    cip.init(Cipher.ENCRYPT_MODE,sk);
     
143.    return cip.doFinal(bytP);
     
144. }
     
145. /**
     
146. 用DES方法解密输入的字节
     
147. bytKey需为8字节长，是解密的密码
     
148. */
     
149. private byte[] decryptByDES(byte[] bytE,byte[] bytKey) throws Exception{
     
150.    DESKeySpec desKS = new DESKeySpec(bytKey);
     
151.    SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
     
152.    SecretKey sk = skf.generateSecret(desKS);
     
153.    Cipher cip = Cipher.getInstance("DES");
     
154.    cip.init(Cipher.DECRYPT_MODE,sk);
     
155.     return cip.doFinal(bytE);
     
156. }
     
157. /**
     
158. 输入密码的字符形式，返回字节数组形式。
     
159. 如输入字符串：AD67EA2F3BE6E5AD
     
160. 返回字节数组：{173,103,234,47,59,230,229,173}
     
161. */
     
162. private byte[] getKeyByStr(String str){
     
163.    byte[] bRet = new byte[str.length()/2];
     
164.    for(int i=0;i< str.length()/2;i++){
     
165.      Integer itg =new Integer(16*getChrInt(str.charAt(2*i)) + getChrInt(str.charAt(2*i+1)));
     
166.      bRet[i] = itg.byteValue();
     
167.    }
     
168.     return bRet;
     
169. }
     
170. /**
     
171. 计算一个16进制字符的10进制值
     
172. 输入：0-F
     
173. */
     
174. private int getChrInt(char chr){
     
175.   int iRet=0;
     
176.   if(chr=="0".charAt(0)) iRet = 0;
     
177.   if(chr=="1".charAt(0)) iRet = 1;
     
178.   if(chr=="2".charAt(0)) iRet = 2;
     
179.   if(chr=="3".charAt(0)) iRet = 3;
     
180.   if(chr=="4".charAt(0)) iRet = 4;
     
181.   if(chr=="5".charAt(0)) iRet = 5;
     
182.   if(chr=="6".charAt(0)) iRet = 6;
     
183.   if(chr=="7".charAt(0)) iRet = 7;
     
184.   if(chr=="8".charAt(0)) iRet = 8;
     
185.   if(chr=="9".charAt(0)) iRet = 9;
     
186.   if(chr=="A".charAt(0)) iRet = 10;
     
187.   if(chr=="B".charAt(0)) iRet = 11;
     
188.   if(chr=="C".charAt(0)) iRet = 12;
     
189.   if(chr=="D".charAt(0)) iRet = 13;
     
190.   if(chr=="E".charAt(0)) iRet = 14;
     
191.   if(chr=="F".charAt(0)) iRet = 15;
     
192.     return iRet;
     
193.   }
     
194. }
     
195. /**
     
196. 文件选择组件。
     
197. */
     
198. class FilePanel extends JPanel{
     
199.   FilePanel(String str){
     
200.    JLabel label = new JLabel(str);
     
201.    JTextField fileText = new JTextField(35);
     
202.    JButton chooseButton = new JButton("浏览...");
     
203.    this.add(label);
     
204.    this.add(fileText);
     
205.    this.add(chooseButton);
     
206.    clickAction ca = new clickAction(this);
     
207.    chooseButton.addActionListener(ca);
     
208. }
     
209. public String getFileName(){
     
210. JTextField jtf = (JTextField)this.getComponent(1);
     
211. return jtf.getText();
     
212. }
     
213. private class clickAction implements ActionListener{
     
214.   clickAction(Component c){
     
215.    cmpt = c;
     
216.   }
     
217.   public void actionPerformed(ActionEvent event){
     
218.     JFileChooser chooser = new JFileChooser();
     
219.     chooser.setCurrentDirectory(new File("."));
     
220.     int ret = chooser.showOpenDialog(cmpt);
     
221.     if(ret==JFileChooser.APPROVE_OPTION){
     
222.        JPanel jp = (JPanel)cmpt;
     
223.        JTextField jtf = (JTextField)jp.getComponent(1);
     
224.        jtf.setText(chooser.getSelectedFile().getPath());
     
225.      }
     
226.   }
     
227.   private Component cmpt;
     
228. }
     
229. }
     
230. /**
     
231. 密码生成组件。
     
232. */
     
233. class KeyPanel extends JPanel{
     
234.   KeyPanel(String str){
     
235.     JLabel label = new JLabel(str);
     
236.     JTextField fileText = new JTextField(35);
     
237.     JButton chooseButton = new JButton("随机产生");
     
238.     this.add(label);
     
239.     this.add(fileText);
     
240.     this.add(chooseButton);
     
241.     clickAction ca = new clickAction(this);
     
242.     chooseButton.addActionListener(ca);
     
243. }
     
244. //返回生成的密码（48个字符长度）
     
245. public String getKey(){
     
246.   JTextField jtf = (JTextField)this.getComponent(1);
     
247.   return jtf.getText();
     
248. }
     
249. private class clickAction implements ActionListener{
     
250.   clickAction(Component c){
     
251.    cmpt = c;
     
252.   }
     
253. public void actionPerformed(ActionEvent event){
     
254. try{
     
255.    KeyGenerator kg = KeyGenerator.getInstance("DES");
     
256.    kg.init(56);
     
257.    Key ke = kg.generateKey();
     
258.    byte[] bytK1 = ke.getEncoded();
     
259.    ke = kg.generateKey();
     
260.    byte[] bytK2 = ke.getEncoded();
     
261.    ke = kg.generateKey();
     
262.    byte[] bytK3 = ke.getEncoded();
     
263.    JPanel jp = (JPanel)cmpt;
     
264.    JTextField jtf = (JTextField)jp.getComponent(1);
     
265.    jtf.setText(getByteStr(bytK1)+getByteStr(bytK2)+getByteStr(bytK3));
     
266. }catch(Exception e){
     
267.     e.printStackTrace();
     
268.   }
     
269. }
     
270. private String getByteStr(byte[] byt){
     
271.   String strRet = "";
     
272.   for(int i=0;i< byt.length;i++){
     
273.    //System.out.println(byt[i]);
     
274.    strRet += getHexValue((byt[i]&240)/16);
     
275.    strRet += getHexValue(byt[i]&15);
     
276.   }
     
277.   return strRet;
     
278. }
     
279. private String getHexValue(int s){
     
280.    String sRet=null;
     
281.    switch (s){
     
282.     case 0: sRet = "0";break;
     
283.     case 1: sRet = "1";break;
     
284.     case 2: sRet = "2";break;
     
285.     case 3: sRet = "3";break;
     
286.     case 4: sRet = "4";break;
     
287.     case 5: sRet = "5";break;
     
288.     case 6: sRet = "6";break;
     
289.     case 7: sRet = "7";break;
     
290.     case 8: sRet = "8";break;
     
291.     case 9: sRet = "9";break;
     
292.     case 10: sRet = "A";break;
     
293.     case 11: sRet = "B";break;
     
294.     case 12: sRet = "C";break;
     
295.     case 13: sRet = "D";break;
     
296.     case 14: sRet = "E";break;
     
297.     case 15: sRet = "F";
     
298. }
     
299.    return sRet;
     
300. }
     
301.   private Component cmpt;
     
302. }
     
303. }
     
304. 程序运行图：
305. 
     
306. [img]http://img.javaxxz.com/2014/11/8/000505468.jpg[/img]

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源码下载：http://file.javaxxz.com/2014/11/8/000505625.zip