Bootstrap

1、Spring Boot 项目文件介绍 -pom.xml

一、解析 pom.xml 文件

（1）让我们来看看默认生成的 pom.xml 文件中到底有些什么：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <!--springboot版本的控制-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.7</version> <!--如果未来你要升级springboot修改此处的版本就可以了-->
        <relativePath/>
    </parent>
    <!--项目的maven的坐标骨架，把当前项目生成在本地仓库的目录-->
    <groupId>com.kuangstudy</groupId>
    <artifactId>springboot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot</name>
    <description>springboot</description>

    <!--maven属性配置，一般用来做version控制居多-->
    <properties>
        <java.version>1.8</java.version>
    </properties>

    <!--项目依赖-->
    <dependencies>
        <!--springboot的web的starter-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!--springboot的test的starter-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <!--springboto的插件，用来打包和构建使用-->
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

在这里插入图片描述

（2）我们可以看到一个比较陌生一些的标签 ，这个标签是在配置 Spring Boot 的父级依赖：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.5.8</version>
    <relativePath/>
</parent>

有了这个，当前的项目才是 Spring Boot 项目，spring-boot-starter-parent 是一个特殊的 starter ，它用来提供相关的 Maven 默认依赖，使用它之后，常用的包依赖就可以省去 version 标签。

下面的版本为什么不加version号：

<!--springboot的web的starter-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

因为：spring-boot-starter-parent 是一个父工程，spring-boot-starter-web和spring-boot-starter-test等都是子工程，而子工程的版本都已经由父工程已经管理起来了。所以在项目开发中我们就不需要指定版本号。那到底parent工程管理了多少呢？点击进去查看一下呗如下：

<activemq.version>5.16.3</activemq.version>
    <antlr2.version>2.7.7</antlr2.version>
    <appengine-sdk.version>1.9.91</appengine-sdk.version>
    <artemis.version>2.17.0</artemis.version>
    <aspectj.version>1.9.7</aspectj.version>
    <assertj.version>3.19.0</assertj.version>
    <atomikos.version>4.0.6</atomikos.version>
    <awaitility.version>4.0.3</awaitility.version>
    <build-helper-maven-plugin.version>3.2.0</build-helper-maven-plugin.version>
    <byte-buddy.version>1.10.22</byte-buddy.version>
    <caffeine.version>2.9.2</caffeine.version>
    <cassandra-driver.version>4.11.3</cassandra-driver.version>
    <classmate.version>1.5.1</classmate.version>
    <commons-codec.version>1.15</commons-codec.version>
    <commons-dbcp2.version>2.8.0</commons-dbcp2.version>
    <commons-lang3.version>3.12.0</commons-lang3.version>
    <commons-pool.version>1.6</commons-pool.version>
    <commons-pool2.version>2.9.0</commons-pool2.version>
    <couchbase-client.version>3.1.7</couchbase-client.version>
    <db2-jdbc.version>11.5.6.0</db2-jdbc.version>
    <dependency-management-plugin.version>1.0.11.RELEASE</dependency-management-plugin.version>
    <derby.version>10.14.2.0</derby.version>
    <dropwizard-metrics.version>4.1.25</dropwizard-metrics.version>
    <ehcache.version>2.10.9.2</ehcache.version>
    <ehcache3.version>3.9.5</ehcache3.version>
    <elasticsearch.version>7.12.1</elasticsearch.version>
    <embedded-mongo.version>3.0.0</embedded-mongo.version>
    <flyway.version>7.7.3</flyway.version>
    <freemarker.version>2.3.31</freemarker.version>
    <git-commit-id-plugin.version>4.0.5</git-commit-id-plugin.version>
    <glassfish-el.version>3.0.3</glassfish-el.version>
    <glassfish-jaxb.version>2.3.5</glassfish-jaxb.version>
    <groovy.version>3.0.8</groovy.version>
    <gson.version>2.8.7</gson.version>
    <h2.version>1.4.200</h2.version>
    <hamcrest.version>2.2</hamcrest.version>
    <hazelcast.version>4.1.5</hazelcast.version>
    <hazelcast-hibernate5.version>2.2.1</hazelcast-hibernate5.version>
    <hibernate.version>5.4.32.Final</hibernate.version>
    <hibernate-validator.version>6.2.0.Final</hibernate-validator.version>
    <hikaricp.version>4.0.3</hikaricp.version>
    <hsqldb.version>2.5.2</hsqldb.version>
    <htmlunit.version>2.49.1</htmlunit.version>
    <httpasyncclient.version>4.1.4</httpasyncclient.version>
    <httpclient.version>4.5.13</httpclient.version>
    <httpclient5.version>5.0.4</httpclient5.version>
    <httpcore.version>4.4.14</httpcore.version>
    <httpcore5.version>5.1.1</httpcore5.version>
    <infinispan.version>12.1.7.Final</infinispan.version>
    <influxdb-java.version>2.21</influxdb-java.version>
    <jackson-bom.version>2.12.4</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-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>3.1.6</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>4.0.3.java8</jaybird.version>
    <jboss-logging.version>3.4.2.Final</jboss-logging.version>
    <jboss-transaction-spi.version>7.6.1.Final</jboss-transaction-spi.version>
    <jdom2.version>2.0.6</jdom2.version>
    <jedis.version>3.6.3</jedis.version>
    <jersey.version>2.33</jersey.version>
    <jetty-el.version>9.0.48</jetty-el.version>
    <jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
    <jetty-reactive-httpclient.version>1.1.10</jetty-reactive-httpclient.version>
    <jetty.version>9.4.43.v20210629</jetty.version>
    <jmustache.version>1.15</jmustache.version>
    <johnzon.version>1.2.14</johnzon.version>
    <jolokia.version>1.6.2</jolokia.version>
    <jooq.version>3.14.13</jooq.version>
    <json-path.version>2.5.0</json-path.version>
    <json-smart.version>2.4.7</json-smart.version>
    <jsonassert.version>1.5.0</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>5.7.2</junit-jupiter.version>
    <kafka.version>2.7.1</kafka.version>
    <kotlin.version>1.5.21</kotlin.version>
    <kotlin-coroutines.version>1.5.1</kotlin-coroutines.version>
    <lettuce.version>6.1.4.RELEASE</lettuce.version>
    <liquibase.version>4.3.5</liquibase.version>
    <log4j2.version>2.14.1</log4j2.version>
    <logback.version>1.2.5</logback.version>
    <lombok.version>1.18.20</lombok.version>
    <mariadb.version>2.7.4</mariadb.version>
    <maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>
    <maven-assembly-plugin.version>3.3.0</maven-assembly-plugin.version>
    <maven-clean-plugin.version>3.1.0</maven-clean-plugin.version>
    <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
    <maven-dependency-plugin.version>3.1.2</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>3.2.0</maven-jar-plugin.version>
    <maven-javadoc-plugin.version>3.2.0</maven-javadoc-plugin.version>
    <maven-resources-plugin.version>3.2.0</maven-resources-plugin.version>
    <maven-shade-plugin.version>3.2.4</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>3.3.1</maven-war-plugin.version>
    <micrometer.version>1.7.3</micrometer.version>
    <mimepull.version>1.9.15</mimepull.version>
    <mockito.version>3.9.0</mockito.version>
    <mongodb.version>4.2.3</mongodb.version>
    <mssql-jdbc.version>9.2.1.jre8</mssql-jdbc.version>
    <mysql.version>8.0.26</mysql.version>
    <nekohtml.version>1.9.22</nekohtml.version>
    <neo4j-java-driver.version>4.2.7</neo4j-java-driver.version>
    <netty.version>4.1.67.Final</netty.version>
    <netty-tcnative.version>2.0.40.Final</netty-tcnative.version>
    <oauth2-oidc-sdk.version>9.9.1</oauth2-oidc-sdk.version>
    <nimbus-jose-jwt.version>9.10.1</nimbus-jose-jwt.version>
    <ojdbc.version>19.3.0.0</ojdbc.version>
    <okhttp3.version>3.14.9</okhttp3.version>
    <oracle-database.version>21.1.0.0</oracle-database.version>
    <pooled-jms.version>1.2.2</pooled-jms.version>
    <postgresql.version>42.2.23</postgresql.version>
    <prometheus-pushgateway.version>0.10.0</prometheus-pushgateway.version>
    <quartz.version>2.3.2</quartz.version>
    <querydsl.version>4.4.0</querydsl.version>
    <r2dbc-bom.version>Arabba-SR10</r2dbc-bom.version>
    <rabbit-amqp-client.version>5.12.0</rabbit-amqp-client.version>
    <reactive-streams.version>1.0.3</reactive-streams.version>
    <reactor-bom.version>2020.0.10</reactor-bom.version>
    <rest-assured.version>4.3.3</rest-assured.version>
    <rsocket.version>1.1.1</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>3.141.59</selenium.version>
    <selenium-htmlunit.version>2.49.1</selenium-htmlunit.version>
    <sendgrid.version>4.7.4</sendgrid.version>
    <servlet-api.version>4.0.1</servlet-api.version>
    <slf4j.version>1.7.32</slf4j.version>
    <snakeyaml.version>1.28</snakeyaml.version>
    <solr.version>8.8.2</solr.version>
    <spring-amqp.version>2.3.10</spring-amqp.version>
    <spring-batch.version>4.3.3</spring-batch.version>
    <spring-data-bom.version>2021.0.4</spring-data-bom.version>
    <spring-framework.version>5.3.9</spring-framework.version>
    <spring-hateoas.version>1.3.3</spring-hateoas.version>
    <spring-integration.version>5.5.3</spring-integration.version>
    <spring-kafka.version>2.7.6</spring-kafka.version>
    <spring-ldap.version>2.3.4.RELEASE</spring-ldap.version>
    <spring-restdocs.version>2.0.5.RELEASE</spring-restdocs.version>
    <spring-retry.version>1.3.1</spring-retry.version>
    <spring-security.version>5.5.2</spring-security.version>
    <spring-session-bom.version>2021.0.2</spring-session-bom.version>
    <spring-ws.version>3.1.1</spring-ws.version>
    <sqlite-jdbc.version>3.34.0</sqlite-jdbc.version>
    <sun-mail.version>1.6.7</sun-mail.version>
    <thymeleaf.version>3.0.12.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>3.0.4.RELEASE</thymeleaf-extras-springsecurity.version>
    <thymeleaf-layout-dialect.version>2.5.3</thymeleaf-layout-dialect.version>
    <tomcat.version>9.0.52</tomcat.version>
    <unboundid-ldapsdk.version>4.0.14</unboundid-ldapsdk.version>
    <undertow.version>2.2.10.Final</undertow.version>
    <versions-maven-plugin.version>2.8.1</versions-maven-plugin.version>
    <webjars-hal-browser.version>3325375</webjars-hal-browser.version>
    <webjars-locator-core.version>0.46</webjars-locator-core.version>
    <wsdl4j.version>1.6.3</wsdl4j.version>

那什么情况下的依赖需要去指定版本号呢？

  • 不想用这个版本号的时候

  • 第三方开发的starter就必须指定版本号。

    <dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.4.2</version>
</dependency>

  • 上面没有提供的就必须指定版本号

    • 首先我不加版本号，看能不能下载，如果能拿忽略
    • 如果不加下载不下例子啊，我就就指定版本号。

  • 可能版本出来冲突，也可能会指定版本号。

关于具体 Spring Boot 提供了哪些 jar 包的依赖，我们可spring-boot-starter-web以查看本地 Maven 仓库下：\repository\org\springframework\boot\spring-boot-dependencies\2.5.7RELEASE\spring-boot-dependencies-2.5.7.RELEASE.pom 文件来查看，挺长的…

悦读

道可道，非常道；名可名，非常名。 无名，天地之始，有名，万物之母。 故常无欲，以观其妙，常有欲，以观其徼。 此两者，同出而异名，同谓之玄，玄之又玄，众妙之门。

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