java加密解密

1. java加密解密

   public class MD5Util {
   /**
   * @param args
   */
   public static void main(String[] args) {
   System.out.println(decrypt("137%128%143%145%124%144%135%143%76%"));

   System.out.println(encrypt("frontdev"));
   }

   /**
   *用户名解密
   *@param ssoToken 字符串
   *@return String 返回加密字符串
   */
   public static String decrypt(String ssoToken)
   {
   try
   {
   String name = new String();
   java.util.StringTokenizer st=new java.util.StringTokenizer(ssoToken,"%");
   while (st.hasMoreElements()) {
   int asc = Integer.parseInt((String)st.nextElement()) - 27;
   name = name + (char)asc;
   }

   return name;
   }catch(Exception e)
   {
   e.printStackTrace() ;
   return null;
   }
   }

   /**
   *用户名加密
   *@param ssoToken 字符串
   *@return String 返回加密字符串
   */
   public static String encrypt(String ssoToken)
   {
   try
   {
   byte[] _ssoToken = ssoToken.getBytes("ISO-8859-1");
   String name = new String();
   // char[] _ssoToken = ssoToken.toCharArray();
   for (int i = 0; i < _ssoToken.length; i++) {
   int asc = _ssoToken[i];
   _ssoToken[i] = (byte) (asc + 27);
   name = name + (asc + 27) + "%";
   }
   return name;
   }catch(Exception e)
   {
   e.printStackTrace() ;
   return null;
   }
   }
   }