之前有人问过hibernate密码问题，大家都没有给出一个具体的解决方案，所以我就看了一下代码，把我的想法和实现拿出来和大家讨论一下。我现在的环境是spring+hibernate，但是这并不影响这个加密解密的问题，其他环境应该是略有不同，但是思路肯定是一样的。
总体思路：在工程的配置文件中填写数据库密码的密文，在应用程序使用datasource的时候解密成明文以创建连接。
步骤1
使用java的中cipher类并使用DES（对称加密算法）算法对明文进行加密
````````````````这里如何使用cipher类和DES算法的原理可以上网查找，我懒得写了，如果大家真的也怕麻烦自己去找的话我再写一个贴出来吧
1public class DESUtil ...{ 2 3 public static void main(String[] args)...{ 4 try ...{ 5 if(args[0].equals("-genKey"))...{ 6 generateKey(args[1]); 7 }else...{ 8 9 //if (args[0].equals("-encrypt"))encrypt(); 10 11 //else decrypt(); 12 } 13 }catch (Exception e) ...{ 14 // TODO: handle exception 15 } 16 } 17 18 public static String encrypt(String plainText, String encryptString, File keyFile)throws IOException, ClassNotFoundException,GeneralSecurityException...{ 19 ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(keyFile)); 20 int mode = Cipher.ENCRYPT_MODE; 21 Key key = (Key)keyIn.readObject(); 22 keyIn.close(); 23 24 InputStream in = new FileInputStream(plainText); 25 OutputStream out = new FileOutputStream(encryptString); 26 27 Cipher cipher = Cipher.getInstance("DES"); 28 cipher.init(mode, key); 29 30 doEncryptAndDecrypt(in, out, cipher); 31 32 String result = out.toString(); 33 System.out.print(result); 34 in.close(); 35 out.close(); 36 return result; 37 } 38 39 public static String decrypt(String encryptString, String plainText, File keyFile)throws IOException, ClassNotFoundException,GeneralSecurityException...{ 40 ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(keyFile)); 41 int mode = Cipher.DECRYPT_MODE; 42 Key key = (Key)keyIn.readObject(); 43 keyIn.close(); 44 45 InputStream in = new FileInputStream(encryptString); 46 OutputStream out = new FileOutputStream(plainText); 47 48 Cipher cipher = Cipher.getInstance("DES"); 49 cipher.init(mode, key); 50 51 doEncryptAndDecrypt(in, out, cipher); 52 53 String result = out.toString(); 54 System.out.print(result); 55 in.close(); 56 out.close(); 57 return result; 58 } 59 60 public static void doEncryptAndDecrypt(InputStream in, OutputStream out, Cipher cipher)throws IOException, GeneralSecurityException...{ 61 int blockSize = cipher.getBlockSize(); 62 int outputSize = cipher.getOutputSize(blockSize); 63 64 byte[] inBytes = new byte[blockSize]; 65 byte[] outBytes = new byte[outputSize]; 66 67 int inLength = 0; 68 boolean more = true; 69 70 while(more)...{ 71 inLength = in.read(inBytes); 72 if(inLength == blockSize)...{ 73 int outLength = cipher.update(inBytes, 0, blockSize, outBytes); 74 out.write(outBytes,0,outLength); 75 } 76 else more = false; 77 } 78 79 if(inLength>0) outBytes = cipher.doFinal(inBytes, 0, inLength); 80 else outBytes = cipher.doFinal(); 81 82 out.write(outBytes); 83 84 } 85 86 public static void generateKey(String path) throws Exception...{ 87 KeyGenerator keygen = KeyGenerator.getInstance("DES"); 88 SecureRandom random = new SecureRandom(); 89 90 keygen.init(random); 91 SecretKey key = keygen.generateKey(); 92 93 ObjectOutputStream out = new ObjectOutputStream( new FileOutputStream(path)); 94 out.writeObject(key); 95 out.close(); 96 } 97 98} 99
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