Java InputStream to ByteBuffer
A neat solution with no 3rd party library needed is
ByteBuffer byteBuffer = ByteBuffer.allocate(inputStream.available());
Channels.newChannel(inputStream).read(byteBuffer);
See ReadableByteChannel#read(ByteBuffer)
For me the best in this case is Apache commons-io to handle this and similar tasks.
The IOUtils
type has a static method to read an InputStream
and return a byte[]
.
InputStream is;
byte[] bytes = IOUtils.toByteArray(is);
Internally this creates a ByteArrayOutputStream
and copies the bytes to the output, then calls toByteArray()
.
UPDATE: as long as you have the byte array
, as @Peter pointed, you have to convert to ByteBuffer
ByteBuffer.wrap(bytes)
JAVA 9 UPDATE: as stated by @saka1029 if you're using java 9+ you can use the default InputStream
API which now includes InputStream::readAllBytes
function, so no external libraries needed
InputStream is;
byte[] bytes = is.readAllBytes()