spring-boot-starter-parent简介

  本指南将帮助您了解Spring Boot Starter Parent如何帮助管理依赖项版本,所有Spring Boot项目通常使用spring-boot-starter-parent作为pom.xml中的父项:

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.0.RELEASE</version>
</parent>

Parent Poms为多个子项目和模块管理以下内容:

  • 配置 - Java版本和其他属性
  • Depedency Management - 依赖项的版本
  • 默认插件配置

内部原理

首先 启动器Spring Boot Starter Parent将spring-boot-dependencies定义为父pom。它从spring-boot-dependencies继承了依赖关系管理。

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>1.4.0.RELEASE</version>
<relativePath>../../spring-boot-dependencies</relativePath>
</parent>

默认的java版本是1.6。项目可以通过<java.version>1.8</java.version>在项目pom中指定属性来覆盖它。还有一些与编码和源相关的其他设置,目标版本也在父pom中设置。

<java.version>1.6</java.version>
<resource.delimiter>@</resource.delimiter> <!-- delimiter that doesn't clash with Spring ${} placeholders -->
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<maven.compiler.source>${java.version}</maven.compiler.source>
<maven.compiler.target>${java.version}</maven.compiler.target>

Spring Boot Starter Parent指定了一系列插件的默认配置,包括maven-failsafe-plugin,maven-jar-plugin和maven-surefire-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>
</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-surefire-plugin</artifactId>
<configuration>
<includes>
<include>**/*Tests.java</include>
<include>**/*Test.java</include>
</includes>
<excludes>
<exclude>**/Abstract*.java</exclude>
</excludes>
</configuration>
</plugin>

Spring Boot Starter Parent从spring-boot-dependencies继承了什么?

Spring Boot Dependencies定义了所有Spring Boot项目的默认依赖关系管理。如果我们想要使用特定依赖项的新版本,我们可以通过在项目pom中指定新属性来覆盖该版本。下面的摘录显示了由Spring Boot Dependencies父pom管理的一些重要依赖项。由于Spring Boot Starter Parent继承自spring-boot-dependencies,因此它也共享所有这些特性。

<properties>
<activemq.version>5.13.4</activemq.version>
...
<ehcache.version>2.10.2.2.21</ehcache.version>
<ehcache3.version>3.1.1</ehcache3.version>
...
<h2.version>1.4.192</h2.version>
<hamcrest.version>1.3</hamcrest.version>
<hazelcast.version>3.6.4</hazelcast.version>
<hibernate.version>5.0.9.Final</hibernate.version>
<hibernate-validator.version>5.2.4.Final</hibernate-validator.version>
<hikaricp.version>2.4.7</hikaricp.version>
<hikaricp-java6.version>2.3.13</hikaricp-java6.version>
<hornetq.version>2.4.7.Final</hornetq.version>
<hsqldb.version>2.3.3</hsqldb.version>
<htmlunit.version>2.21</htmlunit.version>
<httpasyncclient.version>4.1.2</httpasyncclient.version>
<httpclient.version>4.5.2</httpclient.version>
<httpcore.version>4.4.5</httpcore.version>
<infinispan.version>8.2.2.Final</infinispan.version>
<jackson.version>2.8.1</jackson.version>
....
<jersey.version>2.23.1</jersey.version>
<jest.version>2.0.3</jest.version>
<jetty.version>9.3.11.v20160721</jetty.version>
<jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
<spring-security.version>4.1.1.RELEASE</spring-security.version>
<tomcat.version>8.5.4</tomcat.version>
<undertow.version>1.3.23.Final</undertow.version>
<velocity.version>1.7</velocity.version>
<velocity-tools.version>2.0</velocity-tools.version>
<webjars-hal-browser.version>9f96c74</webjars-hal-browser.version>
<webjars-locator.version>0.32</webjars-locator.version>
<wsdl4j.version>1.6.3</wsdl4j.version>
<xml-apis.version>1.4.01</xml-apis.version>
</properties>

将Maven 3.2.1定义为所需的最低版本:

<prerequisites>
<maven>3.2.1</maven>
</prerequisites>

 

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