底下這段是針對RSA在JS長字串處理
對映至 java 是否有相映的方法?

JSEncrypt.prototype.encryptLong = function (text) {
  let k = this.getKey();
  let maxLength = (((k.n.bitLength() + 7) >> 3) - 11);

  try {
      if (text.length > maxLength) {
          let lt = text.match(/.{1,117}/g), ct = '';
          lt.forEach((entry) => { ct += k.encrypt(entry); });
          return ct;
      }

      return k.encrypt(text);
  } catch (ex) {
      console.warn('encryptLong error:', ex);

      return false;
  }
}

// 长文本解密处理
JSEncrypt.prototype.decryptLong = function (text) {
  let k = this.getKey();
  let maxLength = ((k.n.bitLength() + 7) >> 3);

  try {
      if (text.length > maxLength) {
          let lt = text.match(/.{1,256}/g), ct = '';
          lt.forEach((entry) => { ct += k.decrypt(entry); });
          return ct;
      }

      return k.decrypt(text);
  } catch (ex) {
      console.warn('decryptLong error:', ex);

      return false;
  }
}