The pom file contains the parent dependency
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.3.4.RELEASE</version> </parent>
This way we don’t need to write the version number in the child dependency
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies>
This is because the parent dependency helps us fill in the version number ((of course some dependencies do not help us fill in the version number, this time we need to fill in the version number), let's open the parent dependency file and take a look
Entered the parent dependency file
Continue to look for its parent dependency
You can see that there are many dependency version numbers that help us fill in the numbers
Summary: Parent dependency declares the version numbers of almost all dependencies commonly used in development, automatic versions Arbitration mechanism
Although the parent dependency helps us set the version number of commonly used dependencies, its version number can also be modified
For example, mysql driver The version number is set to 8.0.21 by default
There are two main ways to modify it
Modification method 1:
<!--mysql驱动--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.6</version> </dependency>
Modification Method 2:
<properties> <mysql.version>5.1.6</mysql.version> </properties>
You can see that all modifications are successful
Developing the import starter scenario starter
I have seen many spring-boot-starter-*: *Just for a certain scenario
As long as Introducing the starter, we automatically introduce all the commonly required dependencies of this scene
To put it bluntly, the scene starter integrates many dependencies required for a certain scene, without us having to manually import them one by one.
Let’s take a look at what spring-boot-starter-web has integrated for us
You can see that there are quite a lot of things integrated (in SpringBoot All scene launchers will integrate spring-boot-start-web)
#There are many scene launchers officially set by SpringBoot
You can go to the official website to view
In fact, we can also write scenario starters ourselves. The *-spring-boot-starter we see: is a scenario starter provided by a third party to simplify development.
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