如何在java清单类路径中使用正则表达式？

Question

I need to make use of additional jars during the execution of the program. I manually add the jars to the relative ./lib folder and then execute the program. How should I define the classpath in the manifest file?

Answer 1

You can't use regular expressions or other wildcards in the Class-Path attribute of your manifest.

There is only one supported wildcard in Java, and that only works on if specified on the commandline on a "manual" java invocation (ie not using -jar ): using directoryname/* .

Answer 2

I'm not all too sure about what you want exactly, but you can add jars during runtime:

• list (jar) files using File.list() on the directory containing the jars
• do a regex on the filenames you retrieve
• use an URLClassLoader to load the jar

I don't know exactly how to register (if necessary) the URLClassLoaders to the main classloader. But that's the way I think I would go.