Converting byte array to base64 string java

Question

Trying to convert a byte[] to base64 string using org.apache.commons.codec.binary.Base64..For this my java code looks like:

 base64String = Base64.encodeBase64URLSafeString(myByteArray);

But what i see is some invalid characters in the generated base64 string.. ScreenShot

Why do I see these ____ lines in my generated base64 String? Is it a valid string? Note the length of the generated string is dividable by four.

did you try decoding your output? Also, are you using the encoded base64 data in an URL. Use the URLSafe version only when the base64 encoding goes into a http/get or some other url-related operation. — maasg, Jul 23 '12 at 12:48
This might help http://stackoverflow.com/questions/6265912/javax-xml-binds-base64-encoder-decoder-eats-last-two-characters-of-string — tsm, Jul 23 '12 at 12:48
@developer : All I use to convert the `byte[]` to string is a single methid which i have already provided in my question... — Suave Nti, Jul 23 '12 at 13:06

score 3 · Answer 1 · answered Mar 10 '14 at 14:12

have you tried with the encodeBase64String method instead of using encodeBase64URLSafeString ?

encodeBase64URLSafeString:

Encodes binary data using a URL-safe variation of the base64 algorithm but does not chunk the output. The url-safe variation emits - and _ instead of + and / characters.

encodeBase64String:

Encodes binary data using the base64 algorithm but does not chunk the output. NOTE: We changed the behaviour of this method from multi-line chunking (commons-codec-1.4) to single-line non-chunking (commons-codec-1.5).

source : org.apache.commons.codec.binary.Base64 javadoc

score 2 · Answer 2 · edited Apr 01 '16 at 17:42

2

Use

String sCert = javax.xml.bind.DatatypeConverter.printBase64Binary(pk);

edited Apr 01 '16 at 17:42

Paul Roub

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answered Apr 01 '16 at 17:24

Taran

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score 1 · Answer 3 · answered Jul 23 '12 at 12:52

1

This may be helpful

sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();
encoder.encode(byteArray);

answered Jul 23 '12 at 12:52

Koti

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This is bad advice---`sun.misc` package hierarchy is not for public use. – Marko Topolnik Jul 23 '12 at 12:56
I dont want to go with `sun.misc` – Suave Nti Jul 23 '12 at 12:59

PypeBros · Answer 4 · 2012-07-24T08:59:48.487

0

you've got (at least) two flavours of base64, the original one using '+' and '/' in addition to alphanumeric characters, and the "url safe" one, using "-" and "_" so that the content can be enclosed in a URL (or used as a filename, btw).

It looks like you're using a base64 encoder that has been turned into "url-safe mode".

apache's javadoc for URLSafeString()

Oh, and '_' being the last character of the base64 alphabet, seeing strings of "____" means you've been encoding chunks of 0xffffff ... , just like seeing "AAAAAA" means there's a lot of consecutive zeroes.

If you want to be convinced that it's a normal case, just pick your favourite hexadecimal dumper/editor and check what your binary input looked like.

edited Jul 24 '12 at 08:59

answered Jul 23 '12 at 12:52

PypeBros

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Looks a valid comment amongst all yes I have got `/` and replcaed the econding method with `encodeBase64URLSafeString` to avoid slashes.. Then it all started with `_`.. All i need to know is the above is a valid base64 string ?Kindly suggest. – Suave Nti Jul 23 '12 at 13:04
you're asking if the string matches [0-9A-Za-z_-]+ or [0-9A-Za-z/+]+ ? that sounds like a job for a regexp. – PypeBros Jul 24 '12 at 08:57

score -1 · Answer 5 · answered Jul 23 '12 at 12:53

-1

By the below process you can convert byte array to Base64

 // Convert a byte array to base64 string
    byte[] bytearray= new byte[]{0x12, 0x23};
    String s = new sun.misc.BASE64Encoder().encode(bytearray);

    // Convert base64 string to a byte array
    bytearray = new sun.misc.BASE64Decoder().decodeBuffer(s);

Edit:

Please check for guide below link commons apache

answered Jul 23 '12 at 12:53

developer

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` sun.misc.BASE64Decoder()` ?? Why am trying with apache commons – Suave Nti Jul 23 '12 at 12:59
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sun.misc is something internal to Sun's implementation of java/javax packages. There is no guarantee it will always be there (esp. on a different JVM) nor that its interface will remain the same across different releases of the JVM, afaik. – PypeBros Jul 24 '12 at 09:02

Converting byte array to base64 string java

5 Answers5