Java-从不同的Maven模块读取文件

Question

I have an application consisting of three modules: Module A, Module B and Module C (which is a web module). I am using Maven to build the application.

I have the following logic implemented: Module A is included in Module B using a maven dependency and Module B is included in Module C, also by using a dependency (I have separate pom files for each module). Module C is the one that gets deployed.

In Module CI want to have a folder called files, that would contain some content files. This particular folder would be located under the webapp folder. I want to be able to read these files in Module B.

Is there a way to do this? I have tried reading files with getClass().getResourceAsStream("files/file_name") but the returned value was null.

Answer 1

Most clean solution:

• Create a new module D .
• Put the files into D/src/main/resources/WEB-INF/
• Add D as a dependency to B

That makes the files available to B as resource on the classpath while keeping them mostly separate from everything else. Note that to get the files, you have to use

getClass().getResourceAsStream("/WEB-INF/...");

otherwise Java will try to load them relative to the current class.

Be careful that you don't have file in C and D with the same names. If you do, then it can be somewhat random which file Java will pick.

Answer 2

You should consider to put all these files into /src/main/resources directory in order to allow these files being in the application classpath when it is deployed. So, you can consider from your B module that all those files are available in the classpath.

Obviously, you have to take in consideration to copy those files in the /src/main/resources module B's directory.