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Java Forum / General / October 2007base64binary
Hello, I have a class that receives some data encoded as a base64binary string from a SOAP request, and stores it in a byte array. I need to write it to a binary file on disc. I thought that just writing the byte array with a FileOutputStream would do this, but this seems to result in writing the base64 encoding which was received. How do I convert this array into the binary data? Thanks. > I have a class that receives some data encoded as a base64binary > string from a SOAP request, and stores it in a byte array. I need to > write it to a binary file on disc. I thought that just writing the > byte array with a FileOutputStream would do this, but this seems to > result in writing the base64 encoding which was received. > How do I convert this array into the binary data? Decode it before writing. Base64 suppurt are in the Java Mail API. Code snippets: public static byte[] b64encode(byte[] b) throws Exception { ByteArrayOutputStream baos = new ByteArrayOutputStream(); OutputStream b64os = MimeUtility.encode(baos, "base64"); b64os.write(b); b64os.close(); return baos.toByteArray(); } public static byte[] b64decode(byte[] b) throws Exception { ByteArrayInputStream bais = new ByteArrayInputStream(b); InputStream b64is = MimeUtility.decode(bais, "Base64"); byte[] tmp = new byte[b.length]; int n = b64is.read(tmp); byte[] res = new byte[n]; System.arraycopy(tmp, 0, res, 0, n); return res; } Arne PS: Don't your web service toolkit decode automatically ?? On Oct 18, 7:18 pm, Arne Vajh?j <a...@vajhoej.dk> wrote: > PS: Don't your web service toolkit decode automatically ?? Actually, it was! I've gotten around the whole encoding/decoding issue, but for some reason it's not writing the bytes out correctly. I'm using an ObjectOutputStream to write to a FileOutputStream. The problem is there is extra data at the begining of the file. Not sure why. Nothing is prepending the array with extra data... Is there something better than ObjectOutputStream to write an array of bytes? > Actually, it was! I've gotten around the whole encoding/decoding > issue, but for some reason it's not writing the bytes out correctly. > I'm using an ObjectOutputStream to write to a FileOutputStream. If you've got an array of bytes that you want to write verbatim to the file, then you should use the write methods provided by the FileOutputStream itself. Don't wrap it in any kind of Writer, and certainly not an ObjectOutputStream. /gordon -- lord.zoltar@gmail.com schrieb: >> PS: Don't your web service toolkit decode automatically ?? > [quoted text clipped - 4 lines] > why. Nothing is prepending the array with extra data... Is there > something better than ObjectOutputStream to write an array of bytes? The Object Output Stream itself writes these bytes.. just use the FileOutputStream ... it has exactly the method you need.. void write(byte[] b) >The Object Output Stream itself writes these bytes.. >just use the FileOutputStream ... it has exactly the method you need.. >void write(byte[] b) The whole point of base64 is to make sure all bytes are "printable". If you write them out with an ObjectOutputStream you will sandwich them in some unprintable binary housekeeping.  SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com >I'm using an ObjectOutputStream to write to a FileOutputStream. The >problem is there is extra data at the begining of the file. I suspect you don't know what ObjectOutputStream is. It is serialisation format . See http://mindprod.com/jgloss/serialization.html Anything for base64 would more likely go through DataOutPutStream to a ByteArrayStream, converted to Base64 encoded bytes then sent out with a plain OutputStream. Since Base64 is not supported as one of the standard encodings, you can't put it together into a unified outputstream. see http://mindprod.com/jgloss/base64.html SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com >I have a class that receives some data encoded as a base64binary >string from a SOAP request, and stores it in a byte array. I need to >write it to a binary file on disc. I thought that just writing the >byte array with a FileOutputStream would do this, but this seems to >result in writing the base64 encoding which was received. >How do I convert this array into the binary data? see http://mindprod.com/jgloss/base64.html Normally you would decode it back to binary before writing it since the binary is more compact. See http://mindprod.com/applet/fileio.html for how to use a DataOutputStream SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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