java md5加密和base64加密方法

md5加密

private String md5Encode(String plainText) {
   String re_md5 = new String();
   try {
       MessageDigest md = MessageDigest.getInstance("MD5");
       md.update(plainText.getBytes());
       byte         b[] = md.digest();
       int          i;
       StringBuffer buf = new StringBuffer("");
       for (int offset = 0; offset < b.length; offset++) {
           i = b[offset];
           if (i < 0)
               i += 256;
           if (i < 16)
               buf.append("0");
           buf.append(Integer.toHexString(i));
       }
       re_md5 = buf.toString();
   } catch (NoSuchAlgorithmException e) {
       e.printStackTrace();
   }
   return re_md5;
}

base64加密

// import sun.misc.BASE64Encoder;

BASE64Encoder encoder = new BASE64Encoder();
String password = "aaaa" + password + "bbbbb";
String password64 = encoder.encode(password.getBytes());