Java – How to Convert Byte Array to ByteArrayOutputStream

bytebytearrayoutputstreamjava

I need to convert a byte array to ByteArrayOutputStream so that I can display it on screen.

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byte[] bytes = ....;
ByteArrayOutputStream baos = new ByteArrayOutputStream(bytes.length);
baos.write(bytes, 0, bytes.length);

Method description:

Writes len bytes from the specified byte array starting at offset off to this byte array output stream.

Related Solutions

Java – How to Convert InputStream to Byte Array

You can use 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(). It handles large files by copying the bytes in blocks of 4KiB.

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Java – How to Convert InputStream to Byte Array

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