Java OutputStream to Multiple files [duplicate]

Question

I have an OutputStream, and I'd like to (on a conceptual level) broadcast it to multiple files. So for instance, if a byte shows up in the stream, I want that to get written to files A, B, and C.

How can I accomplish this using only one stream? Preferably with a pure Java solution.

Answer 1

You can use Apache Commons IO TeeOutputStream for this purpose. This OutputStream proxies all bytes written to it to two underlying OutputStreams. You can use multiple TeeOutputStreams in a chain when you want to write to more than two OutputStreams at once.

OutputStream out = new TeeOutputStream(new FileOutputStream(new File("A")), new TeeOutputStream(new FileOutputStream(new File("B")), new FileOutputStream(new File("C")))))