如何在仅给出jar文件名的类路径中获取jar文件的绝对路径？

Question

I am aware of getting the path of the jar that contains a specific class

<ClassName>.class.getProtectionDomain().getCodeSource().getLocation()

This is well explored in other SO questions.

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My question is :

"How to get the path of the JAR file in the classpath given ONLY the JAR FILE NAME .

Answer 1

If you are looking to find the path to the currently running jar, try this

new File("", jarName);

If you are looking for something else in the classpath, you could use the same strategy, assuming that they are in the same directory as the jar.

However, if you have set the classpath, either by command line or in the manifest, it might be a little bit more complicated.

This is an example that I found on some website:

ClassLoader cl = ClassLoader.getSystemClassLoader();

URL[] urls = ((URLClassLoader)cl).getURLs();

This will get a list of absolute URLs that point to everything that has been loaded. All that you have to do is do url.getFile()