标准的AEC加密方法

public class AESCrptography {  
      
        public static void main(String[] args) {  
            // TODO Auto-generated method stub  
      
            String content="hello";  
            String key="aaaaaaaa";  
            String iv="abcdefghijklmnop";  
              
            System.out.println("加密前："+byteToHexString(content.getBytes()));  
            byte[ ] encrypted=AES_CBC_Encrypt(content.getBytes(), key.getBytes(), iv.getBytes());  
            System.out.println("加密后："+byteToHexString(encrypted));  
            byte[ ] decrypted=AES_CBC_Decrypt(encrypted, key.getBytes(), iv.getBytes());  
            System.out.println("解密后："+byteToHexString(decrypted));  
        }  
          
        public static byte[] AES_CBC_Encrypt(byte[] content, byte[] keyBytes, byte[] iv){  
              
            try{  
                KeyGenerator keyGenerator=KeyGenerator.getInstance("AES");  
                keyGenerator.init(128, new SecureRandom(keyBytes));  
                SecretKey key=keyGenerator.generateKey();  
                Cipher cipher=Cipher.getInstance("AES/CBC/PKCS5Padding");  
                cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));  
                byte[] result=cipher.doFinal(content);  
                return result;  
            }catch (Exception e) {  
                // TODO Auto-generated catch block  
                System.out.println("exception:"+e.toString());  
            }   
            return null;  
        }  
          
        public static byte[] AES_CBC_Decrypt(byte[] content, byte[] keyBytes, byte[] iv){  
              
            try{  
                KeyGenerator keyGenerator=KeyGenerator.getInstance("AES");  
                keyGenerator.init(128, new SecureRandom(keyBytes));//key长可设为128，192，256位，这里只能设为128  
                SecretKey key=keyGenerator.generateKey();  
                Cipher cipher=Cipher.getInstance("AES/CBC/PKCS5Padding");  
                cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));  
                byte[] result=cipher.doFinal(content);  
                return result;  
            }catch (Exception e) {  
                // TODO Auto-generated catch block  
                System.out.println("exception:"+e.toString());  
            }   
            return null;  
        }  
        //转16进制
        public static String byteToHexString(byte[] bytes) {  
            StringBuffer sb = new StringBuffer(bytes.length);  
            String sTemp;  
            for (int i = 0; i < bytes.length; i++) {  
                sTemp = Integer.toHexString(0xFF & bytes[i]);  
                if (sTemp.length() < 2)  
                    sb.append(0);  
                sb.append(sTemp.toUpperCase());  
            }  
            return sb.toString();  
        }  
    }