What are the features of SpringBoot dependency management?

1. Parent dependency parent introduction

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

2. Modify the default version number

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

3.starter scene starter

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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