Is the jar package for the project or the project for the jar package

yes jar Package find item , Or the project jar package

title , Is relative , Their roles are interchangeable .

The project we wrote , Program and resource files in the project , If they want to interact , You need to be able to see each other , Or the program should see the resource file , When designing the directory structure , Make sure that the resource file can be sniffed by the program .

jar A package is a package , Project package

ext In the catalog jar package Can't see us in workspace Of the project written in , however jvm When compiling programs , Can find ext Under the jar package , As a resource , Compile the project we wrote , When we execute our projects , The project will call ext Under the jar The program in the package performs some operations , For example, looking for configuration files , To configure .

however ,ext Under the jar package , You can only see ext File resources under , Can't see the resource file in our project . That's the problem

Lead to strange phenomena , For example, the configuration is unsuccessful , Unable to find configuration file .

The first point , To find out who threw the exception .（ Program ）

Second point , Observe the whole process from the perspective of the exception thrower , Find the problem .

The following is a demonstration of how to ext In the catalog jar package Become something that can be found by our project .（ apply IDEA, It can't be solved jar How to find a project , If you want to let jar Package found resource file , The resource file must be the same as jar The package is in the same directory , Also note some catalog standards ）

stay File -> Project Structure -> Libraries Click on the + Number , Click on java

Find out what needs to be introduced jar package , Click on ok

Find the corresponding item Click on OK

It's a connection