Spring boot学习笔记2--pom.xml初探究

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新建的springboot_study项目的pom.xml结构如下：

 <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>2.1.0.RELEASE</version>
      <relativePath/> <!-- lookup parent from repository -->
   </parent>

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

   <dependencies>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-web</artifactId>
      </dependency>

      <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
         <scope>runtime</scope>
      </dependency>
      <dependency>
         <groupId>org.projectlombok</groupId>
         <artifactId>lombok</artifactId>
         <optional>true</optional>
      </dependency>
      <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-test</artifactId>
         <scope>test</scope>
      </dependency>
   </dependencies>
//该maven插件用于把项目打成jar包
   <build>
      <plugins>
         <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
         </plugin>
      </plugins>
   </build>
</project>
//从上面可以看出新建的项目依赖于父项目spring-boot-starter-parent

spring-boot-starter-parent结构如下

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-dependencies</artifactId>
    <version>2.1.0.RELEASE</version>
    <relativePath>../../spring-boot-dependencies</relativePath>
</parent>
//spring-boot-starter-paren依赖于父项目spring-boot-dependencies

spring-boot-dependencies 结构如下：

<properties>
    <activemq.version>5.15.7</activemq.version>
    <antlr2.version>2.7.7</antlr2.version>
    <appengine-sdk.version>1.9.67</appengine-sdk.version>
    <artemis.version>2.6.3</artemis.version>
    <aspectj.version>1.9.2</aspectj.version>
    <assertj.version>3.11.1</assertj.version>
    <atomikos.version>4.0.6</atomikos.version>
    <bitronix.version>2.1.4</bitronix.version>
    <build-helper-maven-plugin.version>3.0.0</build-helper-maven-plugin.version>
    <byte-buddy.version>1.9.3</byte-buddy.version>
    <caffeine.version>2.6.2</caffeine.version>
    <cassandra-driver.version>3.6.0</cassandra-driver.version>
    <classmate.version>1.4.0</classmate.version>
    <commons-codec.version>1.11</commons-codec.version>
    <commons-dbcp2.version>2.5.0</commons-dbcp2.version>
    <commons-lang3.version>3.8.1</commons-lang3.version>
    <commons-pool.version>1.6</commons-pool.version>
    <commons-pool2.version>2.6.0</commons-pool2.version>
    <couchbase-cache-client.version>2.1.0</couchbase-cache-client.version>
    <couchbase-client.version>2.7.0</couchbase-client.version>
    <derby.version>10.14.2.0</derby.version>
    <dom4j.version>1.6.1</dom4j.version>
    <dropwizard-metrics.version>4.0.3</dropwizard-metrics.version>
    <ehcache.version>2.10.6</ehcache.version>
    <ehcache3.version>3.6.1</ehcache3.version>
    <elasticsearch.version>6.4.2</elasticsearch.version>
    <embedded-mongo.version>2.1.1</embedded-mongo.version>
    <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
    <flatten-maven-plugin.version>1.0.1</flatten-maven-plugin.version>
    <flyway.version>5.2.1</flyway.version>
    <freemarker.version>2.3.28</freemarker.version>
    <git-commit-id-plugin.version>2.2.5</git-commit-id-plugin.version>
    <glassfish-el.version>3.0.0</glassfish-el.version>
    <glassfish-jaxb.version>2.3.1</glassfish-jaxb.version>
    <groovy.version>2.5.3</groovy.version>
    <gson.version>2.8.5</gson.version>
    <h2.version>1.4.197</h2.version>
    <hamcrest.version>1.3</hamcrest.version>
    <hazelcast.version>3.11</hazelcast.version>
    <hazelcast-hibernate5.version>1.2.3</hazelcast-hibernate5.version>
    <hibernate.version>5.3.7.Final</hibernate.version>
    <hibernate-validator.version>6.0.13.Final</hibernate-validator.version>
    <hikaricp.version>3.2.0</hikaricp.version>
    <hsqldb.version>2.4.1</hsqldb.version>
    <htmlunit.version>2.33</htmlunit.version>
    <httpasyncclient.version>4.1.4</httpasyncclient.version>
    <httpclient.version>4.5.6</httpclient.version>
    <httpcore.version>4.4.10</httpcore.version>
    <infinispan.version>9.4.0.Final</infinispan.version>
    <influxdb-java.version>2.14</influxdb-java.version>
    <jackson.version>2.9.7</jackson.version>
    <janino.version>3.0.10</janino.version>
    <javax-activation.version>1.2.0</javax-activation.version>
    <javax-annotation.version>1.3.2</javax-annotation.version>
    <javax-cache.version>1.1.0</javax-cache.version>
    <javax-jaxb.version>2.3.1</javax-jaxb.version>
    <javax-jaxws.version>2.3.1</javax-jaxws.version>
    <javax-jms.version>2.0.1</javax-jms.version>
    <javax-json.version>1.1.3</javax-json.version>
    <javax-jsonb.version>1.0</javax-jsonb.version>
    <javax-mail.version>1.6.2</javax-mail.version>
    <javax-money.version>1.0.3</javax-money.version>
    <javax-persistence.version>2.2</javax-persistence.version>
    <javax-transaction.version>1.3</javax-transaction.version>
    <javax-validation.version>2.0.1.Final</javax-validation.version>
    <javax-websocket.version>1.1</javax-websocket.version>
    <jaxen.version>1.1.6</jaxen.version>
    <jaybird.version>3.0.5</jaybird.version>
    <jboss-logging.version>3.3.2.Final</jboss-logging.version>
    <jboss-transaction-spi.version>7.6.0.Final</jboss-transaction-spi.version>
    <jdom2.version>2.0.6</jdom2.version>
    <jedis.version>2.9.0</jedis.version>
    <jersey.version>2.27</jersey.version>
    <jest.version>6.3.1</jest.version>
    <jetty.version>9.4.12.v20180830</jetty.version>
    <jetty-el.version>8.5.33</jetty-el.version>
    <jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
    <jetty-reactive-httpclient.version>1.0.1</jetty-reactive-httpclient.version>
    <jmustache.version>1.14</jmustache.version>
    <jna.version>4.5.2</jna.version>
    <joda-time.version>2.10.1</joda-time.version>
    <johnzon.version>${johnzon-jsonb.version}</johnzon.version>
    <johnzon-jsonb.version>1.1.10</johnzon-jsonb.version>
    <jolokia.version>1.6.0</jolokia.version>
    <jooq.version>3.11.5</jooq.version>
    <jsonassert.version>1.5.0</jsonassert.version>
    <json-path.version>2.4.0</json-path.version>
    <jstl.version>1.2</jstl.version>
    <jtds.version>1.3.1</jtds.version>
    <junit.version>4.12</junit.version>
    <junit-jupiter.version>5.3.1</junit-jupiter.version>
    <kafka.version>2.0.0</kafka.version>
    <kotlin.version>1.2.71</kotlin.version>
    <lettuce.version>5.1.2.RELEASE</lettuce.version>
    <liquibase.version>3.6.2</liquibase.version>
    <log4j2.version>2.11.1</log4j2.version>
    <logback.version>1.2.3</logback.version>
    <lombok.version>1.18.2</lombok.version>
    <mariadb.version>2.3.0</mariadb.version>
    <maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>
    <maven-assembly-plugin.version>3.1.0</maven-assembly-plugin.version>
    <maven-clean-plugin.version>3.1.0</maven-clean-plugin.version>
    <maven-compiler-plugin.version>3.8.0</maven-compiler-plugin.version>
    <maven-dependency-plugin.version>3.1.1</maven-dependency-plugin.version>
    <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
    <maven-enforcer-plugin.version>3.0.0-M2</maven-enforcer-plugin.version>
    <maven-failsafe-plugin.version>2.22.1</maven-failsafe-plugin.version>
    <maven-help-plugin.version>3.1.0</maven-help-plugin.version>
    <maven-install-plugin.version>2.5.2</maven-install-plugin.version>
    <maven-invoker-plugin.version>3.1.0</maven-invoker-plugin.version>
    <maven-jar-plugin.version>3.1.0</maven-jar-plugin.version>
    <maven-javadoc-plugin.version>3.0.1</maven-javadoc-plugin.version>
    <maven-resources-plugin.version>3.1.0</maven-resources-plugin.version>
    <maven-shade-plugin.version>3.2.0</maven-shade-plugin.version>
    <maven-site-plugin.version>3.7.1</maven-site-plugin.version>
    <maven-source-plugin.version>3.0.1</maven-source-plugin.version>
    <maven-surefire-plugin.version>2.22.1</maven-surefire-plugin.version>
    <maven-war-plugin.version>3.2.2</maven-war-plugin.version>
    <micrometer.version>1.1.0</micrometer.version>
    <mimepull.version>1.9.10</mimepull.version>
    <mockito.version>2.23.0</mockito.version>
    <mongodb.version>3.8.2</mongodb.version>
    <mongo-driver-reactivestreams.version>1.9.2</mongo-driver-reactivestreams.version>
    <mssql-jdbc.version>6.4.0.jre8</mssql-jdbc.version>
    <mysql.version>8.0.13</mysql.version>
    <nekohtml.version>1.9.22</nekohtml.version>
    <neo4j-ogm.version>3.1.4</neo4j-ogm.version>
    <netty.version>4.1.29.Final</netty.version>
    <netty-tcnative.version>2.0.17.Final</netty-tcnative.version>
    <nio-multipart-parser.version>1.1.0</nio-multipart-parser.version>
    <pooled-jms-version>1.0.3</pooled-jms-version>
    <postgresql.version>42.2.5</postgresql.version>
    <prometheus-pushgateway.version>0.5.0</prometheus-pushgateway.version>
    <quartz.version>2.3.0</quartz.version>
    <querydsl.version>4.2.1</querydsl.version>
    <rabbit-amqp-client.version>5.4.3</rabbit-amqp-client.version>
    <reactive-streams.version>1.0.2</reactive-streams.version>
    <reactor-bom.version>Californium-SR2</reactor-bom.version>
    <rest-assured.version>3.1.1</rest-assured.version>
    <rxjava.version>1.3.8</rxjava.version>
    <rxjava2.version>2.2.3</rxjava2.version>
    <rxjava-adapter.version>1.2.1</rxjava-adapter.version>
    <saaj-impl.version>1.5.0</saaj-impl.version>
    <selenium.version>3.14.0</selenium.version>
    <selenium-htmlunit.version>2.33.0</selenium-htmlunit.version>
    <sendgrid.version>4.3.0</sendgrid.version>
    <servlet-api.version>4.0.1</servlet-api.version>
    <slf4j.version>1.7.25</slf4j.version>
    <snakeyaml.version>1.23</snakeyaml.version>
    <solr.version>7.4.0</solr.version>
    <spring.version>5.1.2.RELEASE</spring.version>
    <spring-amqp.version>2.1.0.RELEASE</spring-amqp.version>
    <spring-batch.version>4.1.0.RELEASE</spring-batch.version>
    <spring-cloud-connectors.version>2.0.3.RELEASE</spring-cloud-connectors.version>
    <spring-data-releasetrain.version>Lovelace-SR2</spring-data-releasetrain.version>
    <spring-framework.version>${spring.version}</spring-framework.version>
    <spring-hateoas.version>0.25.0.RELEASE</spring-hateoas.version>
    <spring-integration.version>5.1.0.RELEASE</spring-integration.version>
    <spring-kafka.version>2.2.0.RELEASE</spring-kafka.version>
    <spring-ldap.version>2.3.2.RELEASE</spring-ldap.version>
    <spring-plugin.version>1.2.0.RELEASE</spring-plugin.version>
    <spring-restdocs.version>2.0.2.RELEASE</spring-restdocs.version>
    <spring-retry.version>1.2.2.RELEASE</spring-retry.version>
    <spring-security.version>5.1.1.RELEASE</spring-security.version>
    <spring-session-bom.version>Bean-RELEASE</spring-session-bom.version>
    <spring-ws.version>3.0.4.RELEASE</spring-ws.version>
    <sqlite-jdbc.version>3.25.2</sqlite-jdbc.version>
    <statsd-client.version>3.1.0</statsd-client.version>
    <sun-mail.version>${javax-mail.version}</sun-mail.version>
    <thymeleaf.version>3.0.11.RELEASE</thymeleaf.version>
    <thymeleaf-extras-data-attribute.version>2.0.1</thymeleaf-extras-data-attribute.version>
    <thymeleaf-extras-java8time.version>3.0.1.RELEASE</thymeleaf-extras-java8time.version>
    <thymeleaf-extras-springsecurity.version>3.0.4.RELEASE</thymeleaf-extras-springsecurity.version>
    <thymeleaf-layout-dialect.version>2.3.0</thymeleaf-layout-dialect.version>
    <tomcat.version>9.0.12</tomcat.version>
    <unboundid-ldapsdk.version>4.0.8</unboundid-ldapsdk.version>
    <undertow.version>2.0.14.Final</undertow.version>
    <versions-maven-plugin.version>2.7</versions-maven-plugin.version>
    <webjars-hal-browser.version>3325375</webjars-hal-browser.version>
    <webjars-locator-core.version>0.35</webjars-locator-core.version>
    <wsdl4j.version>1.6.3</wsdl4j.version>
    <xml-apis.version>1.4.01</xml-apis.version>
    <xml-maven-plugin.version>1.0.2</xml-maven-plugin.version>
    <xmlunit2.version>2.6.2</xmlunit2.version>
</properties>

spring-boot-dependencies 规定了各种jar包的版本号，所以springboot_study中引入spring-boot-dependencies中规定的jar时不需要指定版本号

哪么项目需要的jar包是怎嘛引入的那？

spring-boot-starter-web引入了开发所需的web模块，包括spring-webmvc，hibernate-validator，spring-web，spring-boot-starter-tomcat等等

spring-boot-starter-test引入了开发需要的测试模块，包括mockito，Junit，hamcres等