Adding characters to beginning and end of InputStream in Java

java inputstream bufferedinputstream
pqn picture pqn · Aug 17, 2011 · Viewed 16.8k times · Source

I have an InputStream which I need to add characters to the beginning and end of, and should end up with another variable of type InputStream. How could I easily do this?

Answer

Tom Anderson picture Tom Anderson · Aug 17, 2011

You want a SequenceInputStream and a couple of ByteArrayInputStreams. You can use String.getBytes to make the bytes for the latter. SequenceInputStream is ancient, so it's a little clunky to use:

InputStream middle ;
String beginning = "Once upon a time ...\n";
String end = "\n... and they lived happily ever after.";
List<InputStream> streams = Arrays.asList(
    new ByteArrayInputStream(beginning.getBytes()),
    middle,
    new ByteArrayInputStream(end.getBytes()));
InputStream story = new SequenceInputStream(Collections.enumeration(streams));

If you have a lot of characters to add, and don't want to convert them to bytes en masse, you could put them in a StringReader, then use a ReaderInputStream from Commons IO to read them as bytes. But you would need to add Commons IO to your project to do that. Exact code for that is left as an exercise for the reader.

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