If you use maven to manage it, the jars you reference are either in your local warehouse or in the central warehouse. You can add his jar to your local repository and then reference it. If you quote it directly, you will search it from the central warehouse (that is, there is a maintained warehouse in the network, and all versions of jars are in it). If you don’t have it, you won’t find it.

Add the jar package you introduced to pom.xml in the maven project,

<dependency> 
<groupId>javax.servlet</groupId> 
<artifactId>servlet-api</artifactId> 
         <version>1.1.1</version> 
</dependency> 

这样就可以引入别的jar包，可以通过.class文件名，去网上找寻其中maven仓库的名称

Since Maven is used, wouldn’t it be enough to configure the dependencies in the pom and make it consistent with the jar package version used by others?