How does idea package its own projects into jar packages

One 、 Ideas

First, prepare two projects to establish two , A project as provided jar The works of the package , Another project as a call jar The works of the package .（ Pay attention to idea The project document in is moudule, instead of project,project It's the workspace ）.

Two 、 Create a provider jar Project of the package

1. So let's set up a moudule project , And create a new department class （Dept.java）.

2. open Project Structure, Do the following ：（ Shortcut key ctrl+alt+shift+s）
① choice Artifacts, Click on + Number , Create a new empty one jar Package file

② to jar File naming （ english ）, And pack you into jar The works of the package , Drag to the newly named jar On the bag .

③ The following structure will appear , Then apply .
④ Because we just changed Artifacts Set up , Now we need Build Artifacts. Click on Buid-Buid Artifacts.
Then choose what we want Buid Of jar package .

⑤ Go back to the Project Structure Found exported in jar The path of the package , Then in the corresponding path of our computer , We can find the jar It's packed .

3、 ... and 、 Create a project call jar package , Use jar Class files in the package .

1、 The creation of the project is similar to that before . Under the new project , We build a new one TestMain class , Used to test whether it can call Previous export jar In bag Dept class . The specific steps are as follows ：

① Copy secondjar.jar package , Paste into call jar Under the project of the package

② Right click secondjar.jar, Click on Add as Library.

③ Then click OK , Now it is added successfully , You can call the classes in the package .