BASE64 인코딩 디코딩

public static String base64Encode(String str)  throws java.io.IOException {
  if ( str == null || str.equals("") ) {
     return "";
  } else {
     sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();
     byte[] b1 = str.getBytes();
     String result = encoder.encode(b1);
     return result;
  }
}

public static String base64Decode(String str)  throws java.io.IOException {
  if ( str == null || str.equals("") ) {
     return "";
  } else {
     sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();
     byte[] b1 = decoder.decodeBuffer(str);
     String result = new String(b1);
     return result;
  }
}

base64Encode("인코딩할 문자");
base64Decode("디코딩할 문자");