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.
A ByteArrayOutputStream can read from any InputStream and at the end yield a byte[]. However with a ByteArrayInputStream it is simpler: int n = in.available(); byte[] bytes = new byte[n]; in.read(bytes, 0, n); String s = new String(bytes, StandardCharsets.UTF_8); // Or any encoding. For a ByteArrayInputStream available() yields the total number of bytes. Addendum 2021-11-16 … Read more
If you don’t want to copy all of the data into an in-memory buffer all at once then you’re going to have to have your code that uses the OutputStream (the producer) and the code that uses the InputStream (the consumer) either alternate in the same thread, or operate concurrently in two separate threads. Having … Read more
You can do it with using a FileOutputStream and the writeTo method. ByteArrayOutputStream byteArrayOutputStream = getByteStreamMethod(); try(OutputStream outputStream = new FileOutputStream(“thefilename”)) { byteArrayOutputStream.writeTo(outputStream); } Source: “Creating a file from ByteArrayOutputStream in Java.” on Code Inventions