理解 spring-boot-starter-parent

Posted Firm陈

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<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>1.5.3.RELEASE</version>
	<relativePath/> <!-- lookup parent from repository -->
</parent>

很多springboot项目都引入spring-boot-starter-parent,那么spring-boot-starter-parent的作用是什么?springboot项目必须要引入spring-boot-starter-parent吗?对于跟我一样的新手来说,可能之前会用,但是没有深入理解spring-boot-starter-parent。下面进行简单的总结:
先看看parent的一部分源码:


发现:
(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 1.6。
  • 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

注意:
(1)springboot2上的Java编译版本是1.8

(2)可以更换jdk的版本,不使用默认

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

再看看spring-boot-dependencies,发现里面定义了很多版本号,这个也就是pom文件里面有些依赖我们不必须写或者不需要写版本号的原因

<properties>
		<!-- Dependency versions -->
		<activemq.version>5.14.5</activemq.version>
		<antlr2.version>2.7.7</antlr2.version>
		<appengine-sdk.version>1.9.51</appengine-sdk.version>
		<artemis.version>1.5.4</artemis.version>
		<aspectj.version>1.8.10</aspectj.version>
		<assertj.version>2.6.0</assertj.version>
		<atomikos.version>3.9.3</atomikos.version>
		<bitronix.version>2.1.4</bitronix.version>
		<caffeine.version>2.3.5</caffeine.version>
		<cassandra-driver.version>3.1.4</cassandra-driver.version>
		<classmate.version>1.3.3</classmate.version>
		<commons-beanutils.version>1.9.3</commons-beanutils.version>
		<commons-collections.version>3.2.2</commons-collections.version>
		<commons-codec.version>1.10</commons-codec.version>
		<commons-dbcp.version>1.4</commons-dbcp.version>
		<commons-dbcp2.version>2.1.1</commons-dbcp2.version>
		<commons-digester.version>2.1</commons-digester.version>
		<commons-pool.version>1.6</commons-pool.version>
		<commons-pool2.version>2.4.2</commons-pool2.version>
		<couchbase-client.version>2.3.7</couchbase-client.version>
		<couchbase-cache-client.version>2.1.0</couchbase-cache-client.version>
		<crashub.version>1.3.2</crashub.version>
		<derby.version>10.13.1.1</derby.version>
		<dom4j.version>1.6.1</dom4j.version>
		<dropwizard-metrics.version>3.1.4</dropwizard-metrics.version>
		<ehcache.version>2.10.4</ehcache.version>
		<ehcache3.version>3.2.2</ehcache3.version>
		<embedded-mongo.version>1.50.5</embedded-mongo.version>
		<flyway.version>3.2.1</flyway.version>
		<freemarker.version>2.3.26-incubating</freemarker.version>
		<elasticsearch.version>2.4.4</elasticsearch.version>
		<gemfire.version>8.2.4</gemfire.version>
		<glassfish-el.version>3.0.0</glassfish-el.version>
		<gradle.version>2.9</gradle.version>
		<groovy.version>2.4.10</groovy.version>
		<gson.version>2.8.0</gson.version>
		<h2.version>1.4.194</h2.version>
		<hamcrest.version>1.3</hamcrest.version>
		<hazelcast.version>3.7.7</hazelcast.version>
		<hazelcast-hibernate4.version>3.7.1</hazelcast-hibernate4.version>
		<hazelcast-hibernate5.version>1.1.3</hazelcast-hibernate5.version>
		<hibernate.version>5.0.12.Final</hibernate.version>
		<hibernate-validator.version>5.3.5.Final</hibernate-validator.version>
		<hikaricp.version>2.5.1</hikaricp.version>
		<hikaricp-java6.version>2.3.13</hikaricp-java6.version>
		<hikaricp-java7.version>2.4.11</hikaricp-java7.version>
		<hsqldb.version>2.3.3</hsqldb.version>
		<htmlunit.version>2.21</htmlunit.version>
		<httpasyncclient.version>4.1.3</httpasyncclient.version>
		<httpclient.version>4.5.3</httpclient.version>
		<httpcore.version>4.4.6</httpcore.version>
		<infinispan.version>8.2.6.Final</infinispan.version>
		<jackson.version>2.8.8</jackson.version>
		<janino.version>2.7.8</janino.version>
		<javassist.version>3.21.0-GA</javassist.version> <!-- Same as Hibernate -->
		<javax-cache.version>1.0.0</javax-cache.version>
		<javax-mail.version>1.5.6</javax-mail.version>
		<javax-transaction.version>1.2</javax-transaction.version>
		<javax-validation.version>1.1.0.Final</javax-validation.version>
		<jaxen.version>1.1.6</jaxen.version>
		<jaybird.version>2.2.13</jaybird.version>
		<jboss-logging.version>3.3.1.Final</jboss-logging.version>
		<jboss-transaction-spi.version>7.5.2.Final</jboss-transaction-spi.version>
		<jdom2.version>2.0.6</jdom2.version>
		<jedis.version>2.9.0</jedis.version>
		<jersey.version>2.25.1</jersey.version>
		<jest.version>2.0.4</jest.version>
		<jetty.version>9.4.4.v20170414</jetty.version>
		<jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
		<jetty-el.version>8.0.33</jetty-el.version>
		<jms-api.version>1.1-rev-1</jms-api.version>
		<jmustache.version>1.13</jmustache.version>
		<jna.version>4.2.2</jna.version>
		<joda-time.version>2.9.9</joda-time.version>
		<jolokia.version>1.3.6</jolokia.version>
		<jooq.version>3.9.1</jooq.version>
		<json.version>20140107</json.version>
		<jsonassert.version>1.4.0</jsonassert.version>
		<json-path.version>2.2.0</json-path.version>
		<jstl.version>1.2</jstl.version>
		<jtds.version>1.3.1</jtds.version>
		<junit.version>4.12</junit.version>
		<liquibase.version>3.5.3</liquibase.version>
		<log4j2.version>2.7</log4j2.version>
		<logback.version>1.1.11</logback.version>
		<lombok.version>1.16.16</lombok.version>
		<mariadb.version>1.5.9</mariadb.version>
		<mssql-jdbc.version>6.1.0.jre7</mssql-jdbc.version>
		<mockito.version>1.10.19</mockito.version>
		<mongodb.version>3.4.2</mongodb.version>
		<mysql.version>5.1.41</mysql.version>
		<narayana.version>5.5.7.Final</narayana.version>
		<nekohtml.version>1.9.22</nekohtml.version>
		<neo4j-ogm.version>2.1.2</neo4j-ogm.version>
		<postgresql.version>9.4.1212.jre7</postgresql.version>
		<querydsl.version>4.1.4</querydsl.version>
		<reactor.version>2.0.8.RELEASE</reactor.version>
		<reactor-spring.version>2.0.7.RELEASE</reactor-spring.version>
		<selenium.version>2.53.1</selenium.version>
		<selenium-htmlunit.version>2.21</selenium-htmlunit.version>
		<sendgrid.version>2.2.2</sendgrid.version>
		<servlet-api.version>3.1.0</servlet-api.version>
		<simple-json.version>1.1.1</simple-json.version>
		<slf4j.version>1.7.25</slf4j.version>
		<snakeyaml.version>1.17</snakeyaml.version>
		<solr.version>5.5.4</solr.version>
		<spock.version>1.0-groovy-2.4</spock.version>
		<spring.version>4.3.8.RELEASE</spring.version>
		<spring-amqp.version>1.7.2.RELEASE</spring-amqp.version>
		<spring-cloud-connectors.version>1.2.3.RELEASE</spring-cloud-connectors.version>
		<spring-batch.version>3.0.7.RELEASE</spring-batch.version>
		<spring-data-releasetrain.version>Ingalls-SR3</spring-data-releasetrain.version>
		<spring-hateoas.version>0.23.0.RELEASE</spring-hateoas.version>
		<spring-integration.version>4.3.9.RELEASE</spring-integration.version>
		<spring-integration-java-dsl.version>1.2.1.RELEASE</spring-integration-java-dsl.version>
		<spring-kafka.version>1.1.4.RELEASE</spring-kafka.version>
		<spring-ldap.version>2.3.1.RELEASE</spring-ldap.version>
		<spring-loaded.version>1.2.7.RELEASE</spring-loaded.version>
		<spring-mobile.version>1.1.5.RELEASE</spring-mobile.version>
		<spring-plugin.version>1.2.0.RELEASE</spring-plugin.version>
		<spring-restdocs.version>1.1.2.RELEASE</spring-restdocs.version>
		<spring-retry.version>1.2.0.RELEASE</spring-retry.version>
		<spring-security.version>4.2.2.RELEASE</spring-security.version>
		<spring-security-jwt.version>1.0.7.RELEASE</spring-security-jwt.version>
		<spring-security-oauth.version>2.0.13.RELEASE</spring-security-oauth.version>
		<spring-session.version>1.3.0.RELEASE</spring-session.version>
		<spring-social.version>1.1.4.RELEASE</spring-social.version>
		<spring-social-facebook.version>2.0.3.RELEASE</spring-social-facebook.version>
		<spring-social-linkedinmaven的pom.xml文件报错问题

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