Encode and Decode String Java

Question

I have this code where I am trying to encode and decode and string in java, but am getting compile errors, here is the code with the errors commented in the code:

public static String encrypt(String plainText, SecretKey secretKey)
        throws Exception {
    byte[] plainTextByte = plainText.getBytes();
    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
    byte[] encryptedByte = cipher.doFinal(plainTextByte);
    Encoder encoder = Base64.getEncoder(); //ERROR "cannot resolve method"
    String encryptedText = encoder.encodeToString(encryptedByte);
    return encryptedText;
}

public static String decrypt(String encryptedText, SecretKey secretKey)
        throws Exception {
    Decoder decoder = Base64.getDecoder(); //ERROR "cannot resolve method"
    byte[] encryptedTextByte = (byte[]) decoder.decode(encryptedText);
    cipher.init(Cipher.DECRYPT_MODE, secretKey);
    byte[] decryptedByte = cipher.doFinal(encryptedTextByte);
    String decryptedText = new String(decryptedByte);
    return decryptedText;
}

Thanks for the help in advance

Please use getBytes("UTF-8") should this app at some time run on a non-UTF-8 platform, like Windows. — Joop Eggen
– Joop Eggen, Commented May 29, 2015 at 6:01

1337joe · Accepted Answer · 2015-05-29 05:31:21Z

1

Check your imports and make sure you're importing:

import java.util.Base64;
import java.util.Base64.Decoder;
import java.util.Base64.Encoder;

My IDE found what looks like a couple dozen classes named Base64, so it's entirely possible you're importing the wrong class even though the name matches.

Also note that the java.util.Base64 class was added in java 1.8, so if you're on an older version it won't be available.

answered May 29, 2015 at 5:31

1337joe

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Kliment Goranov · Accepted Answer · 2015-05-29 05:48:24Z

1

You can use org.apache.commons.codec.binary.Base64

import org.apache.commons.codec.binary.Base64;
...
byte[] encodedBytes = Base64.encodeBase64(byteToEncode);

and for decode

byte[] bytes = Base64.decodeBase64(base64String);

answered May 29, 2015 at 5:48

Kliment Goranov

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