First of all please accept my apologies for replying you so late.
You may use a relative file name like this:
File f = new File("images\\49312.jpeg");
To use this format you'll have to know the "current user directory", which most often is where the Java Virtual Machine is invoked. If you are in doubt you can get the name of the current user directory like this:
String userdir = System.getProperty("user.dir");
Please feel free to contact support in case you need any further assistance.