一、简介

   Spring Boot的父级依赖spring-boot-starter-parent配置之后，当前的项目就是Spring Boot项目。

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.12.RELEASE</version>
</parent>

spring-boot-starter-parent也有父级依赖：spring-boot-dependencies（这里规定了很多依赖版本信息）

二、spring-boot-dependencies作用（直接点进pom文件看de）：

• 有默认的打包时的java版本和编码格式
  

• 省略version信息，version信息会从父依赖spring-boot-dependencies中得到继承。
  

• 识别名字包含application以及特点后缀的配置文件
  

• 内置maven工具
  

三、Spring Boot提供了哪些默认jar包的依赖

   可查看该父级依赖的pom文件。大约有200多个依赖包，从中我们可以了解SpringBoot融合了哪些技术栈，便于我们全面了解SpringBoot这门技术。

<!--整体了解SpringBoot所使用的技术栈-->
<properties>
    <activemq.version>5.16.5</activemq.version>
    <antlr2.version>2.7.7</antlr2.version>
    <appengine-sdk.version>1.9.98</appengine-sdk.version>
    <artemis.version>2.19.1</artemis.version>
    <aspectj.version>1.9.7</aspectj.version>
    <assertj.version>3.22.0</assertj.version>
    <atomikos.version>4.0.6</atomikos.version>
    <awaitility.version>4.2.0</awaitility.version>
    <build-helper-maven-plugin.version>3.3.0</build-helper-maven-plugin.version>
    <byte-buddy.version>1.12.20</byte-buddy.version>
    <cache2k.version>2.6.1.Final</cache2k.version>
    <caffeine.version>2.9.3</caffeine.version>
    <cassandra-driver.version>4.14.1</cassandra-driver.version>
    <classmate.version>1.5.1</classmate.version>
    <commons-codec.version>1.15</commons-codec.version>
    <commons-dbcp2.version>2.9.0</commons-dbcp2.version>
    <commons-lang3.version>3.12.0</commons-lang3.version>
    <commons-pool.version>1.6</commons-pool.version>
    <commons-pool2.version>2.11.1</commons-pool2.version>
    <couchbase-client.version>3.3.4</couchbase-client.version>
    <db2-jdbc.version>11.5.7.0</db2-jdbc.version>
    <dependency-management-plugin.version>1.0.15.RELEASE</dependency-management-plugin.version>
    <derby.version>10.14.2.0</derby.version>
    <dropwizard-metrics.version>4.2.14</dropwizard-metrics.version>
    <ehcache.version>2.10.9.2</ehcache.version>
    <ehcache3.version>3.10.8</ehcache3.version>
    <elasticsearch.version>7.17.8</elasticsearch.version>
    <embedded-mongo.version>3.4.11</embedded-mongo.version>
    <flyway.version>8.5.13</flyway.version>
    <freemarker.version>2.3.31</freemarker.version>
    <git-commit-id-plugin.version>4.9.10</git-commit-id-plugin.version>
    <glassfish-el.version>3.0.4</glassfish-el.version>
    <glassfish-jaxb.version>2.3.7</glassfish-jaxb.version>
    <glassfish-jstl.version>1.2.6</glassfish-jstl.version>
    <graphql-java.version>18.3</graphql-java.version>
    <groovy.version>3.0.13</groovy.version>
    <gson.version>2.9.1</gson.version>
    <h2.version>2.1.214</h2.version>
    <hamcrest.version>2.2</hamcrest.version>
    <hazelcast.version>5.1.5</hazelcast.version>
    <hazelcast-hibernate5.version>2.2.1</hazelcast-hibernate5.version>
    <hibernate.version>5.6.14.Final</hibernate.version>
    <hibernate-validator.version>6.2.5.Final</hibernate-validator.version>
    <hikaricp.version>4.0.3</hikaricp.version>
    <hsqldb.version>2.5.2</hsqldb.version>
    <htmlunit.version>2.60.0</htmlunit.version>
    <httpasyncclient.version>4.1.5</httpasyncclient.version>
    <httpclient.version>4.5.14</httpclient.version>
    <httpclient5.version>5.1.4</httpclient5.version>
    <httpcore.version>4.4.16</httpcore.version>
    <httpcore5.version>5.1.5</httpcore5.version>
    <infinispan.version>13.0.14.Final</infinispan.version>
    <influxdb-java.version>2.22</influxdb-java.version>
    <jackson-bom.version>2.13.4.20221013</jackson-bom.version>
    <jakarta-activation.version>1.2.2</jakarta-activation.version>
    <jakarta-annotation.version>1.3.5</jakarta-annotation.version>
    <jakarta-jms.version>2.0.3</jakarta-jms.version>
    <jakarta-json.version>1.1.6</jakarta-json.version>
    <jakarta-json-bind.version>1.0.2</jakarta-json-bind.version>
    <jakarta-mail.version>1.6.7</jakarta-mail.version>
    <jakarta-management.version>1.1.4</jakarta-management.version>
    <jakarta-persistence.version>2.2.3</jakarta-persistence.version>
    <jakarta-servlet.version>4.0.4</jakarta-servlet.version>
    <jakarta-servlet-jsp-jstl.version>1.2.7</jakarta-servlet-jsp-jstl.version>
    <jakarta-transaction.version>1.3.3</jakarta-transaction.version>
    <jakarta-validation.version>2.0.2</jakarta-validation.version>
    <jakarta-websocket.version>1.1.2</jakarta-websocket.version>
    <jakarta-ws-rs.version>2.1.6</jakarta-ws-rs.version>
    <jakarta-xml-bind.version>2.3.3</jakarta-xml-bind.version>
    <jakarta-xml-soap.version>1.4.2</jakarta-xml-soap.version>
    <jakarta-xml-ws.version>2.3.3</jakarta-xml-ws.version>
    <janino.version>3.1.9</janino.version>
    <javax-activation.version>1.2.0</javax-activation.version>
    <javax-annotation.version>1.3.2</javax-annotation.version>
    <javax-cache.version>1.1.1</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>1.1.4</javax-json.version>
    <javax-jsonb.version>1.0</javax-jsonb.version>
    <javax-mail.version>1.6.2</javax-mail.version>
    <javax-money.version>1.1</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>1.2.0</jaxen.version>
    <jaybird.version>4.0.8.java8</jaybird.version>
    <jboss-logging.version>3.4.3.Final</jboss-logging.version>
    <jdom2.version>2.0.6.1</jdom2.version>
    <jedis.version>3.8.0</jedis.version>
    <jersey.version>2.35</jersey.version>
    <jetty-el.version>9.0.52</jetty-el.version>
    <jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
    <jetty-reactive-httpclient.version>1.1.13</jetty-reactive-httpclient.version>
    <jetty.version>9.4.50.v20221201</jetty.version>
    <jmustache.version>1.15</jmustache.version>
    <johnzon.version>1.2.19</johnzon.version>
    <jolokia.version>1.7.1</jolokia.version>
    <jooq.version>3.14.16</jooq.version>
    <json-path.version>2.7.0</json-path.version>
    <json-smart.version>2.4.8</json-smart.version>
    <jsonassert.version>1.5.1</jsonassert.version>
    <jstl.version>1.2</jstl.version>
    <jtds.version>1.3.1</jtds.version>
    <junit.version>4.13.2</junit.version>
    <junit-jupiter.version>5.8.2</junit-jupiter.version>
    <kafka.version>3.1.2</kafka.version>
    <kotlin.version>1.6.21</kotlin.version>
    <kotlin-coroutines.version>1.6.4</kotlin-coroutines.version>
    <lettuce.version>6.1.10.RELEASE</lettuce.version>
    <liquibase.version>4.9.1</liquibase.version>
    <log4j2.version>2.17.2</log4j2.version>
    <logback.version>1.2.11</logback.version>
    <lombok.version>1.18.24</lombok.version>
    <mariadb.version>3.0.9</mariadb.version>
    <maven-antrun-plugin.version>3.0.0</maven-antrun-plugin.version>
    <maven-assembly-plugin.version>3.3.0</maven-assembly-plugin.version>
    <maven-clean-plugin.version>3.2.0</maven-clean-plugin.version>
    <maven-compiler-plugin.version>3.10.1</maven-compiler-plugin.version>
    <maven-dependency-plugin.version>3.3.0</maven-dependency-plugin.version>
    <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
    <maven-enforcer-plugin.version>3.0.0</maven-enforcer-plugin.version>
    <maven-failsafe-plugin.version>2.22.2</maven-failsafe-plugin.version>
    <maven-help-plugin.version>3.2.0</maven-help-plugin.version>
    <maven-install-plugin.version>2.5.2</maven-install-plugin.version>
    <maven-invoker-plugin.version>3.2.2</maven-invoker-plugin.version>
    <maven-jar-plugin.version>3.2.2</maven-jar-plugin.version>
    <maven-javadoc-plugin.version>3.4.1</maven-javadoc-plugin.version>
    <maven-resources-plugin.version>3.2.0</maven-resources-plugin.version>
    <maven-shade-plugin.version>3.3.0</maven-shade-plugin.version>
    <maven-source-plugin.version>3.2.1</maven-source-plugin.version>
    <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
    <maven-war-plugin.version>3.3.2</maven-war-plugin.version>
    <micrometer.version>1.9.6</micrometer.version>
    <mockito.version>4.5.1</mockito.version>
    <mongodb.version>4.6.1</mongodb.version>
    <mssql-jdbc.version>10.2.2.jre8</mssql-jdbc.version>
    <mysql.version>8.0.31</mysql.version>
    <nekohtml.version>1.9.22</nekohtml.version>
    <neo4j-java-driver.version>4.4.11</neo4j-java-driver.version>
    <netty.version>4.1.86.Final</netty.version>
    <okhttp.version>4.9.3</okhttp.version>
    <oracle-database.version>21.5.0.0</oracle-database.version>
    <pooled-jms.version>1.2.4</pooled-jms.version>
    <postgresql.version>42.3.8</postgresql.version>
    <prometheus-client.version>0.15.0</prometheus-client.version>
    <quartz.version>2.3.2</quartz.version>
    <querydsl.version>5.0.0</querydsl.version>
    <r2dbc-bom.version>Borca-SR2</r2dbc-bom.version>
    <rabbit-amqp-client.version>5.14.2</rabbit-amqp-client.version>
    <rabbit-stream-client.version>0.5.0</rabbit-stream-client.version>
    <reactive-streams.version>1.0.4</reactive-streams.version>
    <reactor-bom.version>2020.0.26</reactor-bom.version>
    <rest-assured.version>4.5.1</rest-assured.version>
    <rsocket.version>1.1.3</rsocket.version>
    <rxjava.version>1.3.8</rxjava.version>
    <rxjava-adapter.version>1.2.1</rxjava-adapter.version>
    <rxjava2.version>2.2.21</rxjava2.version>
    <saaj-impl.version>1.5.3</saaj-impl.version>
    <selenium.version>4.1.4</selenium.version>
    <selenium-htmlunit.version>3.61.0</selenium-htmlunit.version>
    <sendgrid.version>4.9.3</sendgrid.version>
    <servlet-api.version>4.0.1</servlet-api.version>
    <slf4j.version>1.7.36</slf4j.version>
    <snakeyaml.version>1.30</snakeyaml.version>
    <solr.version>8.11.2</solr.version>
    <spring-amqp.version>2.4.8</spring-amqp.version>
    <spring-batch.version>4.3.7</spring-batch.version>
    <spring-data-bom.version>2021.2.6</spring-data-bom.version>
    <spring-framework.version>5.3.24</spring-framework.version>
    <spring-graphql.version>1.0.3</spring-graphql.version>
    <spring-hateoas.version>1.5.2</spring-hateoas.version>
    <spring-integration.version>5.5.16</spring-integration.version>
    <spring-kafka.version>2.8.11</spring-kafka.version>
    <spring-ldap.version>2.4.1</spring-ldap.version>
    <spring-restdocs.version>2.0.7.RELEASE</spring-restdocs.version>
    <spring-retry.version>1.3.4</spring-retry.version>
    <spring-security.version>5.7.6</spring-security.version>
    <spring-session-bom.version>2021.2.0</spring-session-bom.version>
    <spring-ws.version>3.1.4</spring-ws.version>
    <sqlite-jdbc.version>3.36.0.3</sqlite-jdbc.version>
    <sun-mail.version>1.6.7</sun-mail.version>
    <thymeleaf.version>3.0.15.RELEASE</thymeleaf.version>
    <thymeleaf-extras-data-attribute.version>2.0.1</thymeleaf-extras-data-attribute.version>
    <thymeleaf-extras-java8time.version>3.0.4.RELEASE</thymeleaf-extras-java8time.version>
    <thymeleaf-extras-springsecurity.version>3.0.5.RELEASE</thymeleaf-extras-springsecurity.version>
    <thymeleaf-layout-dialect.version>3.0.0</thymeleaf-layout-dialect.version>
    <tomcat.version>9.0.70</tomcat.version>
    <unboundid-ldapsdk.version>6.0.7</unboundid-ldapsdk.version>
    <undertow.version>2.2.22.Final</undertow.version>
    <versions-maven-plugin.version>2.10.0</versions-maven-plugin.version>
    <webjars-locator-core.version>0.50</webjars-locator-core.version>
    <wsdl4j.version>1.6.3</wsdl4j.version>
    <xml-maven-plugin.version>1.0.2</xml-maven-plugin.version>
    <xmlunit2.version>2.9.0</xmlunit2.version>
  </properties>

四、管理依赖版本

   spring-boot-starter-parent内有默认的依赖版本、jdk版本…，我们想要更换版本，可以通过properties标签中的property标签来覆盖默认的版本

<!--各依赖的版本管理-->
<properties>
    <java.version>11.0.17</java.version>
    <spring-boot-starter-parent.version>2.3.12.RELEASE</spring-boot-starter-parent.version>
    <spring-cloud.version>Hoxton.SR12</spring-cloud.version>
    <spring-cloud-alibaba.version>2.2.8.RELEASE</spring-cloud-alibaba.version>
    <sprintfox-boot-starter.version>3.0.0</sprintfox-boot-starter.version>
    <log4j.version>3.0.0</log4j.version>
</properties>


<dependencys>
  <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>${log4j.version}</version>
  </dependency>
<dependencys>

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