spring-boot-starter-parent和spring-boot-dependencies的作用

先说spring-boot-dependencies的作用，就是统一管理spring-boot-starter的各个版本控制。在pom.xml再引入starter就无须引入版本号。

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>1.5.4.RELEASE</version>
</parent>

在pom.xml中的添加。

先上一下spring-boot-starter-parent源码

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>2.5.4</version></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><properties><java.version>1.8</java.version><resource.delimiter>@</resource.delimiter><maven.compiler.source>${java.version}</maven.compiler.source><maven.compiler.target>${java.version}</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding></properties><url>https://spring.io/projects/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><build><resources><resource><directory>${basedir}/src/main/resources</directory><filtering>true</filtering><includes><include>**/application*.yml</include><include>**/application*.yaml</include><include>**/application*.properties</include></includes></resource><resource><directory>${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>${kotlin.version}</version><configuration><jvmTarget>${java.version}</jvmTarget><javaParameters>true</javaParameters></configuration><executions><execution><id>compile</id><phase>compile</phase><goals><goal>compile</goal></goals></execution><execution><id>test-compile</id><phase>test-compile</phase><goals><goal>test-compile</goal></goals></execution></executions></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><configuration><parameters>true</parameters></configuration></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-failsafe-plugin</artifactId><executions><execution><goals><goal>integration-test</goal><goal>verify</goal></goals></execution></executions><configuration><classesDirectory>${project.build.outputDirectory}</classesDirectory></configuration></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-jar-plugin</artifactId><configuration><archive><manifest><mainClass>${start-class}</mainClass><addDefaultImplementationEntries>true</addDefaultImplementationEntries></manifest></archive></configuration></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-war-plugin</artifactId><configuration><archive><manifest><mainClass>${start-class}</mainClass><addDefaultImplementationEntries>true</addDefaultImplementationEntries></manifest></archive></configuration></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-resources-plugin</artifactId><configuration><propertiesEncoding>${project.build.sourceEncoding}</propertiesEncoding><delimiters><delimiter>${resource.delimiter}</delimiter></delimiters><useDefaultDelimiters>false</useDefaultDelimiters></configuration></plugin><plugin><groupId>pl.project13.maven</groupId><artifactId>git-commit-id-plugin</artifactId><executions><execution><goals><goal>revision</goal></goals></execution></executions><configuration><verbose>true</verbose><dateFormat>yyyy-MM-dd'T'HH:mm:ssZ</dateFormat><generateGitPropertiesFile>true</generateGitPropertiesFile><generateGitPropertiesFilename>${project.build.outputDirectory}/git.properties</generateGitPropertiesFilename></configuration></plugin><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><executions><execution><id>repackage</id><goals><goal>repackage</goal></goals></execution></executions><configuration><mainClass>${start-class}</mainClass></configuration></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-shade-plugin</artifactId><configuration><keepDependenciesWithProvidedScope>true</keepDependenciesWithProvidedScope><createDependencyReducedPom>true</createDependencyReducedPom><filters><filter><artifact>*:*</artifact><excludes><exclude>META-INF/*.SF</exclude><exclude>META-INF/*.DSA</exclude><exclude>META-INF/*.RSA</exclude></excludes></filter></filters></configuration><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>2.5.4</version></dependency></dependencies><executions><execution><phase>package</phase><goals><goal>shade</goal></goals><configuration><transformers><transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer"><resource>META-INF/spring.handlers</resource></transformer><transformer implementation="org.springframework.boot.maven.PropertiesMergingResourceTransformer"><resource>META-INF/spring.factories</resource></transformer><transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer"><resource>META-INF/spring.schemas</resource></transformer><transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/><transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer"><mainClass>${start-class}</mainClass></transformer></transformers></configuration></execution></executions></plugin></plugins></pluginManagement></build>
</project>

可以看出

1.spring-boot-starter-parent的parent是spring-boot-dependencies
2.parent 的基本功能有哪些？如下

定义了 Java 编译版本，如上为 1.8。
使用 UTF-8 格式编码
maven源文件和目标文件编译的版本
执行打包操作的配置
自动化的资源过滤
自动化的插件配置
针对 application.properties 和 application.yml 的资源过滤，包括通过 profile 定义的不同环境的配置文件，例如 application-dev.properties 和 application-dev.yml

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