Java: Where can I find advanced file manipulation source/libraries?

Question

I'm writing arbitrary byte arrays (mock virus signatures of 32 bytes) into arbitrary files, and I need code to overwrite a specific file given an offset into the file. My specific question is: is there source code/libraries that I can use to perform this particular task?

I've had this problem with Python file manipulation as well. I'm looking for a set of functions that can kill a line, cut/copy/paste, etc. My assumptions are that these are extremely common tasks, and I couldn't find it in the Java API nor my google searches.

Sorry for not RTFM well; I haven't come across any information, and I've been looking for a while now.

Answer 1

Maybe you are looking for something like the RandomAccessFile class in the standard Java JDK. It supports reads and writes at some offset, as well as byte arrays.