Java: Encode String in quoted-printable

Question

I am looking for a way to quoted-printable encode a string in Java just like php\'s native quoted_printable_encode() function.

I have tried to use JavaMails

Answer 1

To use this MimeUtility method you have to create a ByteArrayOutputStream which will accumulate the bytes written to it, which you can then recover. For example, to encode the string original:

ByteArrayOutputStream baos = new ByteArrayOutputStream();
OutputStream encodedOut = MimeUtility.encode(baos, "quoted-printable");
encodedOut.write(original.getBytes());
String encoded = baos.toString();

The encodeText function from the same class will work on strings, but it produces Q-encoding, which is similar to quoted-printable but not quite the same:

String encoded = MimeUtility.encodeText(original, null, "Q");

Answer 2

Thats what helps me

    @Test
public void koi8r() {
    String input = "=5F=F4=ED=5F15=2E05=2E";
    String decode = decode(input, "KOI8-R", "quoted-printable", "KOI8-R");
    Assertions.assertEquals("_ТМ_15.05.", decode);
}

public static String decode(String text, String textEncoding, String encoding, String charset) {
    if (text.length() == 0) {
        return text;
    }

    try {
        byte[] asciiBytes = text.getBytes(textEncoding);
        InputStream decodedStream = MimeUtility.decode(new ByteArrayInputStream(asciiBytes), encoding);
        byte[] tmp = new byte[asciiBytes.length];
        int n = decodedStream.read(tmp);
        byte[] res = new byte[n];
        System.arraycopy(tmp, 0, res, 0, n);
        return new String(res, charset);
    } catch (IOException | MessagingException e) {
        return text;
    }
}