Java Base64

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// encode
byte[] in;
byte[] out=java.util.Base64.getEncoder().encode(in);
System.out.println(new String(out));

// decode
        byte[] byteArray = Base64.getDecoder().decode(value.getBytes());
        String base64Decode = new String(byteArray, StandardCharsets.UTF_8);

        System.out.println("base64 decode: " + base64Decode);