SpringBoot系列（三）——Springboot项目中的spring-boot-starter-parent，spring-boot-dependencies依赖关系

た入场券 2023-06-25 05:00 6阅读 0赞

**目录**

1、项目pom文件依赖，父级项目spring-boot-starter-parent

2、再看spring-boot-starter-parent

3、spring-boot-dependencies-2.2.2.RELEASE.pom

4、总结

--------------------

使用简单的Springboot生成项目很简单，简单归简单，那他究竟默认都帮我们引入了哪些包。pom文件的依赖关系又是怎样的。

让我们一探究竟。

# 1、项目pom文件依赖，父级项目spring-boot-starter-parent #

以一个简单的springboot工程来查看其pom文件，可以看出父级项目是spring-boot-starter-parent

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.2.2.RELEASE</version>
            <relativePath/>
        </parent>
        <groupId>com.example</groupId>
        <artifactId>demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>demo</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

# 2、再看spring-boot-starter-parent #

点击进spring-boot-starter-parent再看其pom文件，spring-boot-starter-parent-2.2.2.RELEASE.pom ，注释说明了该文件的一些注意点。

<?xml version="1.0" encoding="utf-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-dependencies</artifactId>
        <version>2.2.2.RELEASE</version>
        
        <relativePath>../../spring-boot-dependencies</relativePath>
      </parent>
      <artifactId>spring-boot-starter-parent</artifactId>
      <packaging>pom</packaging>
      <name>Spring Boot Starter Parent</name>
      <description>Parent pom providing dependency and plugin management for applications
            built with Maven</description>
      <url>https://projects.spring.io/spring-boot/#/spring-boot-starter-parent</url>
    
      <properties>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    
        
        <resource.delimiter>@</resource.delimiter>
        <maven.compiler.source>${java.version}</maven.compiler.source>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.target>${java.version}</maven.compiler.target>
      </properties>
    
      
      <build>
        <resources>
          <resource>
            <filtering>true</filtering>
            <directory>${basedir}/src/main/resources</directory>
            <includes>
              <include>**/application*.yml</include>
              <include>**/application*.yaml</include>
              <include>**/application*.properties</include>
            </includes>
          </resource>
          <resource>
            <directory>${basedir}/src/main/resources</directory>
            <excludes>
              <exclude>**/application*.yml</exclude>
              <exclude>**/application*.yaml</exclude>
              <exclude>**/application*.properties</exclude>
            </excludes>
          </resource>
        </resources>
    
        <pluginManagement>
          <plugins>
            <plugin>
              <groupId>org.jetbrains.kotlin</groupId>
              <artifactId>kotlin-maven-plugin</artifactId>
              <version>${kotlin.version}</version>
            </plugin>
        
          </plugins>
        </pluginManagement>
      </build>
    </project>

# 3、spring-boot-dependencies-2.2.2.RELEASE.pom #

根据spring-boot-starter-parent-2.2.2.RELEASE.pom 的父级项目spring-boot-dependencies再继续分析，下面的文件省去原有大量的properties和dependency

<?xml version="1.0" encoding="utf-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-dependencies</artifactId>
      <version>2.2.2.RELEASE</version>
      <packaging>pom</packaging>
      <name>Spring Boot Dependencies</name>
      <description>Spring Boot Dependencies</description>
      <url>https://projects.spring.io/spring-boot/#</url>
      <licenses>
        <license>
          <name>Apache License, Version 2.0</name>
          <url>https://www.apache.org/licenses/LICENSE-2.0</url>
        </license>
      </licenses>
      <developers>
        <developer>
          <name>Pivotal</name>
          <email>info@pivotal.io</email>
          <organization>Pivotal Software, Inc.</organization>
          <organizationUrl>https://www.spring.io</organizationUrl>
        </developer>
      </developers>
      <scm>
        <url>https://github.com/spring-projects/spring-boot</url>
      </scm>
    
       
      <properties>
        <activemq.version>5.15.11</activemq.version>
         
      </properties>
    
    
      
      <dependencyManagement>
        <dependencies>
          <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot</artifactId>
            <version>2.2.2.RELEASE</version>
          </dependency>
        </dependencies>
      </dependencyManagement>
    
      <build>
        
        <pluginManagement>
          <plugins>
            <plugin>
              <groupId>org.apache.johnzon</groupId>
              <artifactId>johnzon-maven-plugin</artifactId>
              <version>${johnzon.version}</version>
            </plugin>
          </plugins>
        </pluginManagement>
      </build>
    </project>

# 4、总结 #

总结一下，继承 spring-boot-starter-parent 来作为父项目， spring-boot-starter-parent的父项目又是Spring Boot Dependencies，  
已经定义好了很多包的依赖，可以统一项目的依赖，避免后续的版本冲突。

Maven users can inherit from the spring-boot-starter-parent project to obtain sensible defaults. The parent project provides the following features:

Java 1.8 as the default compiler level.  
UTF-8 source encoding.  
A Dependency Management section, inherited from the spring-boot-dependencies pom, that manages the versions of common dependencies. This dependency management lets you omit <version> tags for those dependencies when used in your own pom.  
An execution of the repackage goal with a repackage execution id.  
Sensible resource filtering.  
Sensible plugin configuration (exec plugin, Git commit ID, and shade).  
Sensible resource filtering for application.properties and application.yml including profile-specific files (for example, application-dev.properties and application-dev.yml)  
Note that, since the application.properties and application.yml files accept Spring style placeholders ($\{…\}), the Maven filtering is changed to use @..@ placeholders. (You can override that by setting a Maven property called resource.delimiter.)

Java  
默认使用Java 8  
使用UTF-8编码  
一个引用管理的功能，在dependencies里的部分配置可以不用填写version信息，这些version信息会从spring-boot-dependencies里得到继承。  
识别资源过滤  
识别插件的配置(exec plugin, surefire, Git commit ID, shade).能够识别application.properties和application.yml类型的文件，同时也能支持profile-specific类型的文件（如： application-foo.properties and application-foo.yml，这个功能可以更好的配置不同生产环境下的配置文件)。  
   
摘自官方文档[https://docs.spring.io/spring-boot/docs/1.3.0.M5/reference/html/using-boot-build-systems.html][https_docs.spring.io_spring-boot_docs_1.3.0.M5_reference_html_using-boot-build-systems.html]

[https_docs.spring.io_spring-boot_docs_1.3.0.M5_reference_html_using-boot-build-systems.html]: https://docs.spring.io/spring-boot/docs/1.3.0.M5/reference/html/using-boot-build-systems.html