IntelliJ idea add maven lib during the project

If a project is in process, but a maven lib is needed, for example:

<dependency>
  <groupId>com.squareup.okhttp3</groupId>
  <artifactId>mockwebserver</artifactId>
  <version>3.10.0</version>
  <scope>test</scope>
</dependency>

Method 1:

In project, File - Project Structure - Libraries - + - From Maven, input com.squareup.okhttp3(That is "groupId"), click Search icon then Arrow icon.

OR

File - New - Module - Maven - Next.
This site can be referred to.

Method 2:

In IntelliJ project panel, choose '${project name}' - right click - Add framework support - Choose 'Maven' - OK.
After this operation, a pom.xml is automatically generated by IntelliJ IDE.