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javajava-8inputstream

Java 1.8 and below equivalent for InputStream.readAllBytes()

I wrote a program that gets all bytes from an InputStream in Java 9 with

InputStream.readAllBytes()

Now, I want to export it to Java 1.8 and below. Is there an equivalent function? Couldn't find one.

Solution

  • Here's one way to solve this without relying on third-party libraries:

    inputStream.reset();
byte[] bytes = new byte[inputStream.available()];
DataInputStream dataInputStream = new DataInputStream(inputStream);
dataInputStream.readFully(bytes);

    Or if you don't mind using thirdparties (Commons IO):

    
byte[] bytes = IOUtils.toByteArray(is);

    Guava also helps:

    byte[] bytes = ByteStreams.toByteArray(inputStream);