Carriage return issue decoding Base64 from Java an

问题:

I have a servlet that has resized and encoded an image into base64. I encode it like this

BufferedImage newBuf = .. a bufferedImage...
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(bufferedImage, sImgFormat, baos);
baos.flush();
imageInBytes = baos.toByteArray();

I then encode this into base64 to send to the browser like this

sun.misc.BASE64Encoder encoder = new BASE64Encoder();
String sEncImage = "data:image/jpg;base64," + encoder.encodeBuffer(imageInBytes);

The browser will receive the encoding and it works except for the carriage returns, ("\n") embedded consistently within the string which corrupts the image. When I remove the carriage returns the image is fine. Is there a way to generate the encoding without the carriage returns. Or must I filter it out myself before sending it back ?

(I am using J2SE 1.4.2 and need to continue to do so)

回答1:

I suspect that the sun.misc.Base64encoder is chunking the output. I wouldn't use sun.misc classes as it restricts your code to Oracle JVMs (for example, it would work in IBM Websphere). I'd use the commons Base64 encoder or Base64OutputStream.