Getting class byte from a jar file

[Robert Mark Bram]

Howdy All!

Is it possible to obtain the byte for an individual class in a jar file?

I know we can get the byte for any physical file, I also know we can
manipulate ZipEntry objects through a JarFile.

Maybe we somehow obtain class bytes from a ZipEntry?

Any thoughts would be appreciated!

Rob

 

[Chris Smith]

Howdy All!

Is it possible to obtain the byte for an individual class in a jar file?

I know we can get the byte for any physical file, I also know we can
manipulate ZipEntry objects through a JarFile.

Maybe we somehow obtain class bytes from a ZipEntry?

By "class bytes" do you mean the bytecode for a class? If so, then yes
you can certainly get it by using the ZipEntry. Open the ZipInputStream
(or a subclass like JarInputStream), keep called getNextEntry() until
you see the one you want, and then read the binary class definition just
as you typically would from an InputStream.

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