编码字符串是否有最大 base64 大小？

Question

I'm using Base64 for encode a very huge JSON string with thousands of data, after encoded I'm storing on disk. Later I'm retrieving again from disk and decoding it again into readable normal string JSON.

public static String encryptString(String string) {     
    byte[] bytesEncoded = Base64.getMimeEncoder().encode(string.getBytes());
    return (new String(bytesEncoded));
}

public static String decryptString(String string) {
    byte[] bytesDecoded = Base64.getMimeDecoder().decode(string);
    return (new String(bytesDecoded));
}

Does a limitation exist in the size of the Base64 encode and decode functions? Or am I able to encode and decode super big strings?

Answer 1

No maximum size, but I'd like to also suggest different approach to encrypt and decrypt

Encrypt

public static String encrypt(String strClearText,String strKey) throws Exception{
    String strData="";

    try {
        SecretKeySpec skeyspec=new SecretKeySpec(strKey.getBytes(),"Blowfish");
        Cipher cipher=Cipher.getInstance("Blowfish");
        cipher.init(Cipher.ENCRYPT_MODE, skeyspec);
        String isoText = new String(strClearText.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1); // there are shorthand ways of doing this, but this is for your explaination
        byte[] encrypted=cipher.doFinal(isoText.getBytes(StandardCharsets.ISO_8859_1));
        strData=Base64.getEncoder().encodeToString(encrypted);

    } catch (Exception e) {
        e.printStackTrace();
        throw new Exception(e);
    }
    return strData;
}

Decrypt

public static String decrypt(String strEncrypted,String strKey) throws Exception{
    String strData="";

    try {
        SecretKeySpec skeyspec=new SecretKeySpec(strKey.getBytes(),"Blowfish");
        Cipher cipher=Cipher.getInstance("Blowfish");
        cipher.init(Cipher.DECRYPT_MODE, skeyspec);
        byte[] decrypted=cipher.doFinal(Base64.getDecoder().decode(strEncrypted));
        isoStrData=new String(decrypted, StandardCharsets.ISO_8859_1);
        strData=new String(isoStrData.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);
    } catch (Exception e) {
        e.printStackTrace();
        throw new Exception(e);
    }
    return strData;
}

key can always be a constant in your program, but it is not recommended.