数据库加密详解编程语言

1. 用  <bean class=“com.cyou.web.common.EncryptPropertyPlaceholderConfigurer” p:location=“classpath:/config.properties”></bean>  
2. 代替  <context:property-placeholder location=“classpath:/config.properties” />  public class DESUtils  
3. 1. {  
   2.     private static Key key;  
   3.     private static String KEY_STR=“mykey”;  
   4.       
   5.     static{  
   6.         try  
   7.         {  
   8.             KeyGenerator generator = KeyGenerator.getInstance(“DES”);  
   9.             SecureRandom secureRandom=SecureRandom.getInstance(“SHA1PRNG”);  
   10.             secureRandom.setSeed(KEY_STR.getBytes());  
   11.             generator.init(secureRandom);  
   12.             key = generator.generateKey();  
   13.             generator=null;  
   14.         }  
   15.         catch (Exception e)  
   16.         {  
   17.             throw new RuntimeException(e);  
   18.         }  
   19.     }  
   20.       
   21.     /** 
   22.      * 对字符串进行加密，返回BASE64的加密字符串 
   23.      * <功能详细描述> 
   24.      * @param str 
   25.      * @return 
   26.      * @see [类、类#方法、类#成员] 
   27.      */  
   28.     public static String getEncryptString(String str){  
   29.         BASE64Encoder base64Encoder = new BASE64Encoder();  
   30.         System.out.println(key);  
   31.         try  
   32.         {  
   33.             byte[] strBytes = str.getBytes(“UTF-8”);  
   34.             Cipher cipher = Cipher.getInstance(“DES”);  
   35.             cipher.init(Cipher.ENCRYPT_MODE, key);  
   36.             byte[] encryptStrBytes = cipher.doFinal(strBytes);  
   37.             return base64Encoder.encode(encryptStrBytes);  
   38.         }  
   39.         catch (Exception e)  
   40.         {  
   41.             throw new RuntimeException(e);  
   42.         }  
   43.           
   44.     }  
   45.       
   46.     /** 
   47.      * 对BASE64加密字符串进行解密 
   48.      * <功能详细描述> 
   49.      * @param str 
   50.      * @return 
   51.      * @see [类、类#方法、类#成员] 
   52.      */  
   53.     public static String getDecryptString(String str){  
   54.         BASE64Decoder base64Decoder = new BASE64Decoder();  
   55.         try  
   56.         {  
   57.             byte[] strBytes = base64Decoder.decodeBuffer(str);  
   58.             Cipher cipher = Cipher.getInstance(“DES”);  
   59.             cipher.init(Cipher.DECRYPT_MODE, key);  
   60.             byte[] encryptStrBytes = cipher.doFinal(strBytes);  
   61.             return new String(encryptStrBytes,“UTF-8”);  
   62.         }  
   63.         catch (Exception e)  
   64.         {  
   65.             throw new RuntimeException(e);  
   66.         }  
   67.           
   68.     }  
   69.       
   70.       
   71.     public static void main(String[] args)  
   72.     {  
   73.         String name =“root”;  
   74.         String password=“1234”;  
   75.         String encryname = getEncryptString(name);  
   76.         String encrypassword = getEncryptString(password);  
   77.         System.out.println(encryname);  
   78.         System.out.println(encrypassword);  
   79.           
   80.         System.out.println(getDecryptString(encryname));  
   81.         System.out.println(getDecryptString(encrypassword));  
   82.     }  
   83. }  

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