Java InputStream to ByteBuffer

java inputstream bytebuffer
elect picture elect · May 4, 2015 · Viewed 33.2k times · Source

I am reading dds textures, but since once built the jar I can't access those textures through url and file and have to use InputStream instead.

So I would need to know how I can obtain a java.​nio.ByteBuffer from an java.io.InputStream.

Ps: no matter through 3rd part libraries, I just need it working

Answer

Jordi Castilla picture Jordi Castilla · May 4, 2015

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()

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