使用Java jar应用程序中的目录

Question

I have java app, where I copy directories (with subdir and files) to SDCard. I wanted to save these dirs with project. In eclipse everything works fine. But, when I export project to runnable jar, app is not able to find or copy these dirs. No error is showed.

File folder2 = new File(getClass().getResource("/urgent/").getFile());
File folder4 = new File(getClass().getResource("/service/").getFile());

The path, I get from jar app, when I want to copy dir is:

jar:file:\C:\path\to\jar\file\myapp.jar!\urgent

project hierarchy:

-project
 --src
 --build
 --urgent
  ---subdir
 --service
  ---subdir

Is it possible to work with your own directories in jar and how?

Answer 1

You are trying to work on resources on you classpath, a random folder on your harddrive is not in it, so you cannot find it.

What you need to do is: 1. Work with parameters from the commandline (see how to use args[] in your main method) 2. use those arguments to parametrize your custom copy mehod

or:

Try using the copyDirectory(File srcDir, File destDir) method from the Apache Commons IO library instead. To use this reearch how to include libraries in your project, preferably by using maven.