Question

I have a servlet which reads BINARY file and sends it to a client.

byte[] binaryData = FileUtils.readFileToByteArray(path);
response.getWriter().print(new String(binaryData));

It works for NON BINARY files. When I have a BINARY file, I get receive file length bigger than origin or received file not the same. How I can read and send binary data?

Thanks.

Answer 1

Not via the Writer. Writers are for text data, not binary data. Your current code is trying to interpret arbitrary binary data as text, using the system default encoding. That’s a really bad idea.

You want an output stream – so use response.getOutputStream(), and write the binary data to that:

response.getOutputStream().write(FileUtils.readFileToByteArray(path));