Read binary files that are wraped in the downloaded executable signed jar

Question

Hello, there:
I have created a Swing application and created a signed jar file and uploaded it to my site. The signed jar includes class packages, and a folder of binary files which are the datasource for my application.
jws downloads this signed executable jar, it'll automatically run it, but it has problems reading the binary folders wrapped in itself (the app is supposed to read the folder's structure and use the info to create a JTree object, and read the file's content as well). Is it the file path conversion problem? Do we need to use URL instead? I tried it after reading some threads on this forum but didn't make it.
As an alternatives, I want JWS to unjar the jar file and expand it to exploded files. I manually unjar it and run the app from command line, it works fine.
Plus, the app is supposed to manipulate the binary files when it's in process, like saving new content back to the files, zip the files and upload them to the remote sql server. therefore, I think it's easy to have it run when it's expanded.
So here is the question: JWS by default is running the executable jar, is there a way to tell JWS to unzip the jar and find the main class in the exploded files and run it?
Thanks a lot for your suggestions,
Sway

Answer 1

You can get to any resource in a jar file in your classpath. The code below will return InputStream for resource.bin nested two packages down.
InputStream in = YourClass.class.getResourceAsStream("/com/mypackage/resouce.bin");  //use '/' instead of '.'You can open a FileOutputStream to write that file.
OutputStream out = new FileOutputStream("myTempResource.bin");
IOUtil.streamAndClose(in,out);If the resouce is a nested zip or nested jar then you can use the Java Zip utilities to unwrap the stream.