前言

我们在做java项目的时候由于jar包太多，我们就需要使用maven做项目管理，管理项目的jar包依赖，包括打包上线

maven基础

Maven 是一个项目管理工具，主要用于项目构建，依赖管理，项目信息管理

每个maven 项目根目录都会有一个 pom.xml文件， 负责项目构建，依赖管理

在这个文件里面，你只需要添加相应的jar包坐标配置，maven就会自动帮你下载相应jar包，不需要我们手动去构建添加jar包很方面，尤其在项目很大，需要jar包依赖很多时候，根本离不开maven

在maven的代码库中，每一个jar包也有自己的 pom.xml文件配置，只要你配置的jar包所依赖的其他jar包都会被maven自动下载下来。

这里会涉及到问题maven多模块实现以及循环依赖 后面会讲解

  1.     <dependency>
  2.       <groupId>cn.soboys</groupId>  项目组项目所在团队
  3.       <artifactId>kmall</artifactId>  项目具体名称模块名
  4.       <version>1.0-SNAPSHOT</version>  项目版本号
  5.     </dependency>

maven都会通过，<groupId>-<artifactId>-<version>坐标来定位一个jar包

在maven互联网仓库上，并进行下载

Maven 会根据 POM 文件自动下载所需 JAR 包。如果以后你在本地其它项目中也使用此 JAR 包，那么 Maven 会首先检查本地是否有 JAR 包，如果没有再从中央仓库下载。

maven 项目结构命令

  1. src/main/java - 存放项目.java文件；
  2. src/main/resources - 存放项目资源文件；
  3. src/test/java - 存放测试类.java文件；
  4. src/test/resources - 存放测试资源文件；
  5. target - 项目输出目录；
  6. pom.xml - Maven核心文件（Project Object Model）；

maven常用命令

  1. mvn archetype：create 创建Maven项目
  2. mvn compile 编译源代码
  3. mvn deploy 发布项目
  4. mvn test-compile 编译测试源代码
  5. mvn test 运行应用程序中的单元测试
  6. mvn site 生成项目相关信息的网站
  7. mvn clean 清除项目目录中的生成结果
  8. mvn package 根据项目生成的jar
  9. mvn install 在本地Repository中安装jar
  10. mvn eclipse:eclipse 生成eclipse项目文件
  11. mvnjetty:run 启动jetty服务
  12. mvntomcat:run 启动tomcat服务
  13. mvn clean package -Dmaven.test.skip=true 清除以前的包后重新打包，跳过测试类

maven 常用标签

parent标签

在maven多模块项目中引用父pom依赖，在springboot项目中就有父依赖

  1.   <!--引用springBoot父项目-->
  2.     <parent>
  3.         <groupId>org.springframework.boot</groupId>
  4.         <artifactId>spring-boot-starter-parent</artifactId>
  5.         <version>2.4.7</version>
  6.         <relativePath/> <!-- lookup parent from repository -->
  7.     </parent>

properties标签

定义一些全局属性值，常用于jar包版本定义全局管理jar包版本后面可以${} 取值

在springboot项目中父pom会定义一些项目jar包版本依赖 ，所以我们在引用jar时候才不用写jar包版本，会自动跟随父pom中定义的jar包版本

  1. <parent>
  2.     <groupId>org.springframework.boot</groupId>
  3.     <artifactId>spring-boot-dependencies</artifactId>
  4.     <version>2.4.7</version>
  5.   </parent>
  1. <properties>
  2.     <activemq.version>5.16.2</activemq.version>
  3.     <antlr2.version>2.7.7</antlr2.version>
  4.     <appengine-sdk.version>1.9.89</appengine-sdk.version>
  5.     <artemis.version>2.15.0</artemis.version>
  6.     <aspectj.version>1.9.6</aspectj.version>
  7.     <assertj.version>3.18.1</assertj.version>
  8.     <atomikos.version>4.0.6</atomikos.version>
  9.     <awaitility.version>4.0.3</awaitility.version>
  10.     <bitronix.version>2.1.4</bitronix.version>
  11.     <build-helper-maven-plugin.version>3.2.0</build-helper-maven-plugin.version>
  12.     <byte-buddy.version>1.10.22</byte-buddy.version>
  13.     <caffeine.version>2.8.8</caffeine.version>
  14.     <cassandra-driver.version>4.9.0</cassandra-driver.version>
  15.     <classmate.version>1.5.1</classmate.version>
  16.     <commons-codec.version>1.15</commons-codec.version>
  17.     <commons-dbcp2.version>2.8.0</commons-dbcp2.version>
  18.     <commons-lang3.version>3.11</commons-lang3.version>
  19.     <commons-pool.version>1.6</commons-pool.version>
  20.     <commons-pool2.version>2.9.0</commons-pool2.version>
  21.     <couchbase-client.version>3.0.10</couchbase-client.version>
  22.     <db2-jdbc.version>11.5.5.0</db2-jdbc.version>
  23.     <dependency-management-plugin.version>1.0.11.RELEASE</dependency-management-plugin.version>
  24.     <derby.version>10.14.2.0</derby.version>
  25.     <dropwizard-metrics.version>4.1.22</dropwizard-metrics.version>
  26.     <ehcache.version>2.10.9.2</ehcache.version>
  27.     <ehcache3.version>3.9.4</ehcache3.version>
  28.     <elasticsearch.version>7.9.3</elasticsearch.version>
  29.     <embedded-mongo.version>2.2.0</embedded-mongo.version>
  30.     <flyway.version>7.1.1</flyway.version>
  31.     <freemarker.version>2.3.31</freemarker.version>
  32.     <git-commit-id-plugin.version>3.0.1</git-commit-id-plugin.version>
  33.     <glassfish-el.version>3.0.3</glassfish-el.version>
  34.     <glassfish-jaxb.version>2.3.4</glassfish-jaxb.version>
  35.     <groovy.version>2.5.14</groovy.version>
  36.     <gson.version>2.8.7</gson.version>
  37.     <h2.version>1.4.200</h2.version>
  38.     <hamcrest.version>2.2</hamcrest.version>
  39.     <hazelcast.version>4.0.3</hazelcast.version>
  40.     <hazelcast-hibernate5.version>2.1.1</hazelcast-hibernate5.version>
  41.     <hibernate.version>5.4.32.Final</hibernate.version>
  42.     <hibernate-validator.version>6.1.7.Final</hibernate-validator.version>
  43.     <hikaricp.version>3.4.5</hikaricp.version>
  44.     <hsqldb.version>2.5.2</hsqldb.version>
  45.     <htmlunit.version>2.44.0</htmlunit.version>
  46.     <httpasyncclient.version>4.1.4</httpasyncclient.version>
  47.     <httpclient.version>4.5.13</httpclient.version>
  48.     <httpcore.version>4.4.14</httpcore.version>
  49.     <infinispan.version>11.0.11.Final</infinispan.version>
  50.     <influxdb-java.version>2.20</influxdb-java.version>
  51.     <jackson-bom.version>2.11.4</jackson-bom.version>
  52.     <jakarta-activation.version>1.2.2</jakarta-activation.version>
  53.     <jakarta-annotation.version>1.3.5</jakarta-annotation.version>
  54.     <jakarta-jms.version>2.0.3</jakarta-jms.version>
  55.     <jakarta-json.version>1.1.6</jakarta-json.version>
  56.     <jakarta-json-bind.version>1.0.2</jakarta-json-bind.version>
  57.     <jakarta-mail.version>1.6.7</jakarta-mail.version>
  58.     <jakarta-persistence.version>2.2.3</jakarta-persistence.version>
  59.     <jakarta-servlet.version>4.0.4</jakarta-servlet.version>
  60.     <jakarta-servlet-jsp-jstl.version>1.2.7</jakarta-servlet-jsp-jstl.version>
  61.     <jakarta-transaction.version>1.3.3</jakarta-transaction.version>
  62.     <jakarta-validation.version>2.0.2</jakarta-validation.version>
  63.     <jakarta-websocket.version>1.1.2</jakarta-websocket.version>
  64.     <jakarta-ws-rs.version>2.1.6</jakarta-ws-rs.version>
  65.     <jakarta-xml-bind.version>2.3.3</jakarta-xml-bind.version>
  66.     <jakarta-xml-soap.version>1.4.2</jakarta-xml-soap.version>
  67.     <jakarta-xml-ws.version>2.3.3</jakarta-xml-ws.version>
  68.     <janino.version>3.1.4</janino.version>
  69.     <javax-activation.version>1.2.0</javax-activation.version>
  70.     <javax-annotation.version>1.3.2</javax-annotation.version>
  71.     <javax-cache.version>1.1.1</javax-cache.version>
  72.     <javax-jaxb.version>2.3.1</javax-jaxb.version>
  73.     <javax-jaxws.version>2.3.1</javax-jaxws.version>
  74.     <javax-jms.version>2.0.1</javax-jms.version>
  75.     <javax-json.version>1.1.4</javax-json.version>
  76.     <javax-jsonb.version>1.0</javax-jsonb.version>
  77.     <javax-mail.version>1.6.2</javax-mail.version>
  78.     <javax-money.version>1.1</javax-money.version>
  79.     <javax-persistence.version>2.2</javax-persistence.version>
  80.     <javax-transaction.version>1.3</javax-transaction.version>
  81.     <javax-validation.version>2.0.1.Final</javax-validation.version>
  82.     <javax-websocket.version>1.1</javax-websocket.version>
  83.     <jaxen.version>1.2.0</jaxen.version>
  84.     <jaybird.version>3.0.11</jaybird.version>
  85.     <jboss-logging.version>3.4.2.Final</jboss-logging.version>
  86.     <jboss-transaction-spi.version>7.6.1.Final</jboss-transaction-spi.version>
  87.     <jdom2.version>2.0.6</jdom2.version>
  88.     <jedis.version>3.3.0</jedis.version>
  89.     <jersey.version>2.32</jersey.version>
  90.     <jetty-el.version>8.5.54</jetty-el.version>
  91.     <jetty-jsp.version>2.2.0.v201112011158</jetty-jsp.version>
  92.     <jetty-reactive-httpclient.version>1.1.9</jetty-reactive-httpclient.version>
  93.     <jetty.version>9.4.42.v20210604</jetty.version>
  94.     <jmustache.version>1.15</jmustache.version>
  95.     <johnzon.version>1.2.13</johnzon.version>
  96.     <jolokia.version>1.6.2</jolokia.version>
  97.     <jooq.version>3.14.11</jooq.version>
  98.     <json-path.version>2.4.0</json-path.version>
  99.     <json-smart.version>2.3.1</json-smart.version>
  100.     <jsonassert.version>1.5.0</jsonassert.version>
  101.     <jstl.version>1.2</jstl.version>
  102.     <jtds.version>1.3.1</jtds.version>
  103.     <junit.version>4.13.2</junit.version>
  104.     <junit-jupiter.version>5.7.2</junit-jupiter.version>
  105.     <kafka.version>2.6.2</kafka.version>
  106.     <kotlin.version>1.4.32</kotlin.version>
  107.     <kotlin-coroutines.version>1.4.3</kotlin-coroutines.version>
  108.     <lettuce.version>6.0.5.RELEASE</lettuce.version>
  109.     <liquibase.version>3.10.3</liquibase.version>
  110.     <log4j2.version>2.13.3</log4j2.version>
  111.     <logback.version>1.2.3</logback.version>
  112.     <lombok.version>1.18.20</lombok.version>
  113.     <mariadb.version>2.7.3</mariadb.version>
  114.     <maven-antrun-plugin.version>1.8</maven-antrun-plugin.version>
  115.     <maven-assembly-plugin.version>3.3.0</maven-assembly-plugin.version>
  116.     <maven-clean-plugin.version>3.1.0</maven-clean-plugin.version>
  117.     <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
  118.     <maven-dependency-plugin.version>3.1.2</maven-dependency-plugin.version>
  119.     <maven-deploy-plugin.version>2.8.2</maven-deploy-plugin.version>
  120.     <maven-enforcer-plugin.version>3.0.0-M3</maven-enforcer-plugin.version>
  121.     <maven-failsafe-plugin.version>2.22.2</maven-failsafe-plugin.version>
  122.     <maven-help-plugin.version>3.2.0</maven-help-plugin.version>
  123.     <maven-install-plugin.version>2.5.2</maven-install-plugin.version>
  124.     <maven-invoker-plugin.version>3.2.2</maven-invoker-plugin.version>
  125.     <maven-jar-plugin.version>3.2.0</maven-jar-plugin.version>
  126.     <maven-javadoc-plugin.version>3.2.0</maven-javadoc-plugin.version>
  127.     <maven-resources-plugin.version>3.2.0</maven-resources-plugin.version>
  128.     <maven-shade-plugin.version>3.2.4</maven-shade-plugin.version>
  129.     <maven-source-plugin.version>3.2.1</maven-source-plugin.version>
  130.     <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
  131.     <maven-war-plugin.version>3.3.1</maven-war-plugin.version>
  132.     <micrometer.version>1.6.7</micrometer.version>
  133.     <mimepull.version>1.9.14</mimepull.version>
  134.     <mockito.version>3.6.28</mockito.version>
  135.     <mongodb.version>4.1.2</mongodb.version>
  136.     <mssql-jdbc.version>8.4.1.jre8</mssql-jdbc.version>
  137.     <mysql.version>8.0.25</mysql.version>
  138.     <nekohtml.version>1.9.22</nekohtml.version>
  139.     <neo4j-java-driver.version>4.1.3</neo4j-java-driver.version>
  140.     <netty.version>4.1.65.Final</netty.version>
  141.     <netty-tcnative.version>2.0.39.Final</netty-tcnative.version>
  142.     <oauth2-oidc-sdk.version>8.36.1</oauth2-oidc-sdk.version>
  143.     <nimbus-jose-jwt.version>8.20.2</nimbus-jose-jwt.version>
  144.     <ojdbc.version>19.3.0.0</ojdbc.version>
  145.     <okhttp3.version>3.14.9</okhttp3.version>
  146.     <oracle-database.version>19.8.0.0</oracle-database.version>
  147.     <pooled-jms.version>1.2.2</pooled-jms.version>
  148.     <postgresql.version>42.2.20</postgresql.version>
  149.     <prometheus-pushgateway.version>0.9.0</prometheus-pushgateway.version>
  150.     <quartz.version>2.3.2</quartz.version>
  151.     <querydsl.version>4.4.0</querydsl.version>
  152.     <r2dbc-bom.version>Arabba-SR10</r2dbc-bom.version>
  153.     <rabbit-amqp-client.version>5.10.0</rabbit-amqp-client.version>
  154.     <reactive-streams.version>1.0.3</reactive-streams.version>
  155.     <reactor-bom.version>2020.0.7</reactor-bom.version>
  156.     <rest-assured.version>3.3.0</rest-assured.version>
  157.     <rsocket.version>1.1.1</rsocket.version>
  158.     <rxjava.version>1.3.8</rxjava.version>
  159.     <rxjava-adapter.version>1.2.1</rxjava-adapter.version>
  160.     <rxjava2.version>2.2.21</rxjava2.version>
  161.     <saaj-impl.version>1.5.3</saaj-impl.version>
  162.     <selenium.version>3.141.59</selenium.version>
  163.     <selenium-htmlunit.version>2.44.0</selenium-htmlunit.version>
  164.     <sendgrid.version>4.6.8</sendgrid.version>
  165.     <servlet-api.version>4.0.1</servlet-api.version>
  166.     <slf4j.version>1.7.30</slf4j.version>
  167.     <snakeyaml.version>1.27</snakeyaml.version>
  168.     <solr.version>8.5.2</solr.version>
  169.     <spring-amqp.version>2.3.8</spring-amqp.version>
  170.     <spring-batch.version>4.3.3</spring-batch.version>
  171.     <spring-data-bom.version>2020.0.9</spring-data-bom.version>
  172.     <spring-framework.version>5.3.8</spring-framework.version>
  173.     <spring-hateoas.version>1.2.6</spring-hateoas.version>
  174.     <spring-integration.version>5.4.7</spring-integration.version>
  175.     <spring-kafka.version>2.6.9</spring-kafka.version>
  176.     <spring-ldap.version>2.3.4.RELEASE</spring-ldap.version>
  177.     <spring-restdocs.version>2.0.5.RELEASE</spring-restdocs.version>
  178.     <spring-retry.version>1.3.1</spring-retry.version>
  179.     <spring-security.version>5.4.6</spring-security.version>
  180.     <spring-session-bom.version>2020.0.4</spring-session-bom.version>
  181.     <spring-ws.version>3.0.10.RELEASE</spring-ws.version>
  182.     <sqlite-jdbc.version>3.32.3.3</sqlite-jdbc.version>
  183.     <sun-mail.version>1.6.7</sun-mail.version>
  184.     <thymeleaf.version>3.0.12.RELEASE</thymeleaf.version>
  185.     <thymeleaf-extras-data-attribute.version>2.0.1</thymeleaf-extras-data-attribute.version>
  186.     <thymeleaf-extras-java8time.version>3.0.4.RELEASE</thymeleaf-extras-java8time.version>
  187.     <thymeleaf-extras-springsecurity.version>3.0.4.RELEASE</thymeleaf-extras-springsecurity.version>
  188.     <thymeleaf-layout-dialect.version>2.5.3</thymeleaf-layout-dialect.version>
  189.     <tomcat.version>9.0.46</tomcat.version>
  190.     <unboundid-ldapsdk.version>4.0.14</unboundid-ldapsdk.version>
  191.     <undertow.version>2.2.8.Final</undertow.version>
  192.     <versions-maven-plugin.version>2.8.1</versions-maven-plugin.version>
  193.     <webjars-hal-browser.version>3325375</webjars-hal-browser.version>
  194.     <webjars-locator-core.version>0.46</webjars-locator-core.version>
  195.     <wsdl4j.version>1.6.3</wsdl4j.version>
  196.     <xml-maven-plugin.version>1.0.2</xml-maven-plugin.version>
  197.     <xmlunit2.version>2.7.0</xmlunit2.version>
  198.   </properties>

dependencyManagement标签

在Maven多模块的时候，管理依赖关系是非常重要的，各种依赖包冲突，查询问题起来非常复杂，于是就用到了，

在springboot项目中父模块就定义了

  1.   <dependencyManagement>
  2.         <dependencies>
  4.              <dependency>
  5.             <groupId>org.springframework.boot</groupId>
  6.             <artifactId>spring-boot-starter</artifactId>
  7.             <version>2.4.7</version>
  8.           </dependency>
  9.           <dependency>
  10.             <groupId>org.springframework.boot</groupId>
  11.             <artifactId>spring-boot-starter-activemq</artifactId>
  12.             <version>2.4.7</version>
  13.           </dependency>
  14.           <dependency>
  15.             <groupId>org.springframework.boot</groupId>
  16.             <artifactId>spring-boot-starter-actuator</artifactId>
  17.             <version>2.4.7</version>
  18.           </dependency>
  19.           <dependency>
  20.             <groupId>org.springframework.boot</groupId>
  21.             <artifactId>spring-boot-starter-amqp</artifactId>
  22.             <version>2.4.7</version>
  23.           </dependency>
  24.           <dependency>
  25.             <groupId>org.springframework.boot</groupId>
  26.             <artifactId>spring-boot-starter-aop</artifactId>
  27.             <version>2.4.7</version>
  28.           </dependency>
  29.           <dependency>
  30.             <groupId>org.springframework.boot</groupId>
  31.             <artifactId>spring-boot-starter-artemis</artifactId>
  32.             <version>2.4.7</version>
  33.           </dependency>
  34.           <dependency>
  35.             <groupId>org.springframework.boot</groupId>
  36.             <artifactId>spring-boot-starter-batch</artifactId>
  37.             <version>2.4.7</version>
  38.           </dependency>
  39.           <dependency>
  40.             <groupId>org.springframework.boot</groupId>
  41.             <artifactId>spring-boot-starter-cache</artifactId>
  42.             <version>2.4.7</version>
  43.           </dependency>
  44.           <dependency>
  45.             <groupId>org.springframework.boot</groupId>
  46.             <artifactId>spring-boot-starter-data-cassandra</artifactId>
  47.             <version>2.4.7</version>
  48.           </dependency>
  49.           <dependency>
  50.             <groupId>org.springframework.boot</groupId>
  51.             <artifactId>spring-boot-starter-data-cassandra-reactive</artifactId>
  52.             <version>2.4.7</version>
  53.           </dependency>
  54.           <dependency>
  55.             <groupId>org.springframework.boot</groupId>
  56.             <artifactId>spring-boot-starter-data-couchbase</artifactId>
  57.             <version>2.4.7</version>
  58.           </dependency>
  59.           <dependency>
  60.             <groupId>org.springframework.boot</groupId>
  61.             <artifactId>spring-boot-starter-data-couchbase-reactive</artifactId>
  62.             <version>2.4.7</version>
  63.           </dependency>
  64.           <dependency>
  65.             <groupId>org.springframework.boot</groupId>
  66.             <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
  67.             <version>2.4.7</version>
  68.           </dependency>
  69.           <dependency>
  70.             <groupId>org.springframework.boot</groupId>
  71.             <artifactId>spring-boot-starter-data-jdbc</artifactId>
  72.             <version>2.4.7</version>
  73.           </dependency>
  74.           <dependency>
  75.             <groupId>org.springframework.boot</groupId>
  76.             <artifactId>spring-boot-starter-data-jpa</artifactId>
  77.             <version>2.4.7</version>
  78.           </dependency>
  79.           <dependency>
  80.             <groupId>org.springframework.boot</groupId>
  81.             <artifactId>spring-boot-starter-data-ldap</artifactId>
  82.             <version>2.4.7</version>
  83.           </dependency>
  84.           <dependency>
  85.             <groupId>org.springframework.boot</groupId>
  86.             <artifactId>spring-boot-starter-data-mongodb</artifactId>
  87.             <version>2.4.7</version>
  88.           </dependency>
  89.           <dependency>
  90.             <groupId>org.springframework.boot</groupId>
  91.             <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
  92.             <version>2.4.7</version>
  93.           </dependency>
  94.           <dependency>
  95.             <groupId>org.springframework.boot</groupId>
  96.             <artifactId>spring-boot-starter-data-r2dbc</artifactId>
  97.             <version>2.4.7</version>
  98.           </dependency>
  99.           <dependency>
  100.             <groupId>org.springframework.boot</groupId>
  101.             <artifactId>spring-boot-starter-data-redis</artifactId>
  102.             <version>2.4.7</version>
  103.           </dependency>
  104.           <dependency>
  105.             <groupId>org.springframework.boot</groupId>
  106.             <artifactId>spring-boot-starter-data-redis-reactive</artifactId>
  107.             <version>2.4.7</version>
  108.           </dependency>
  109.           <dependency>
  110.             <groupId>org.springframework.boot</groupId>
  111.             <artifactId>spring-boot-starter-data-neo4j</artifactId>
  112.             <version>2.4.7</version>
  113.           </dependency>
  114.           <dependency>
  115.             <groupId>org.springframework.boot</groupId>
  116.             <artifactId>spring-boot-starter-data-rest</artifactId>
  117.             <version>2.4.7</version>
  118.           </dependency>
  119.           <dependency>
  120.             <groupId>org.springframework.boot</groupId>
  121.             <artifactId>spring-boot-starter-data-solr</artifactId>
  122.             <version>2.4.7</version>
  123.           </dependency>
  124.           <dependency>
  125.             <groupId>org.springframework.boot</groupId>
  126.             <artifactId>spring-boot-starter-freemarker</artifactId>
  127.             <version>2.4.7</version>
  128.           </dependency>
  129.           <dependency>
  130.             <groupId>org.springframework.boot</groupId>
  131.             <artifactId>spring-boot-starter-groovy-templates</artifactId>
  132.             <version>2.4.7</version>
  133.           </dependency>
  134.           <dependency>
  135.             <groupId>org.springframework.boot</groupId>
  136.             <artifactId>spring-boot-starter-hateoas</artifactId>
  137.             <version>2.4.7</version>
  138.           </dependency>
  139.           <dependency>
  140.             <groupId>org.springframework.boot</groupId>
  141.             <artifactId>spring-boot-starter-integration</artifactId>
  142.             <version>2.4.7</version>
  143.           </dependency>
  144.           <dependency>
  145.             <groupId>org.springframework.boot</groupId>
  146.             <artifactId>spring-boot-starter-jdbc</artifactId>
  147.             <version>2.4.7</version>
  148.           </dependency>
  149.           <dependency>
  150.             <groupId>org.springframework.boot</groupId>
  151.             <artifactId>spring-boot-starter-jersey</artifactId>
  152.             <version>2.4.7</version>
  153.           </dependency>
  154.           <dependency>
  155.             <groupId>org.springframework.boot</groupId>
  156.             <artifactId>spring-boot-starter-jetty</artifactId>
  157.             <version>2.4.7</version>
  158.           </dependency>
  159.           <dependency>
  160.             <groupId>org.springframework.boot</groupId>
  161.             <artifactId>spring-boot-starter-jooq</artifactId>
  162.             <version>2.4.7</version>
  163.           </dependency>
  164.           <dependency>
  165.             <groupId>org.springframework.boot</groupId>
  166.             <artifactId>spring-boot-starter-json</artifactId>
  167.             <version>2.4.7</version>
  168.           </dependency>
  169.           <dependency>
  170.             <groupId>org.springframework.boot</groupId>
  171.             <artifactId>spring-boot-starter-jta-atomikos</artifactId>
  172.             <version>2.4.7</version>
  173.           </dependency>
  174.           <dependency>
  175.             <groupId>org.springframework.boot</groupId>
  176.             <artifactId>spring-boot-starter-jta-bitronix</artifactId>
  177.             <version>2.4.7</version>
  178.           </dependency>
  179.           <dependency>
  180.             <groupId>org.springframework.boot</groupId>
  181.             <artifactId>spring-boot-starter-log4j2</artifactId>
  182.             <version>2.4.7</version>
  183.           </dependency>
  184.           <dependency>
  185.             <groupId>org.springframework.boot</groupId>
  186.             <artifactId>spring-boot-starter-logging</artifactId>
  187.             <version>2.4.7</version>
  188.           </dependency>
  189.           <dependency>
  190.             <groupId>org.springframework.boot</groupId>
  191.             <artifactId>spring-boot-starter-mail</artifactId>
  192.             <version>2.4.7</version>
  193.           </dependency>
  194.           <dependency>
  195.             <groupId>org.springframework.boot</groupId>
  196.             <artifactId>spring-boot-starter-mustache</artifactId>
  197.             <version>2.4.7</version>
  198.           </dependency>
  199.           <dependency>
  200.             <groupId>org.springframework.boot</groupId>
  201.             <artifactId>spring-boot-starter-oauth2-client</artifactId>
  202.             <version>2.4.7</version>
  203.           </dependency>
  204.           <dependency>
  205.             <groupId>org.springframework.boot</groupId>
  206.             <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
  207.             <version>2.4.7</version>
  208.           </dependency>
  209.           <dependency>
  210.             <groupId>org.springframework.boot</groupId>
  211.             <artifactId>spring-boot-starter-quartz</artifactId>
  212.             <version>2.4.7</version>
  213.           </dependency>
  214.           <dependency>
  215.             <groupId>org.springframework.boot</groupId>
  216.             <artifactId>spring-boot-starter-reactor-netty</artifactId>
  217.             <version>2.4.7</version>
  218.           </dependency>
  219.           <dependency>
  220.             <groupId>org.springframework.boot</groupId>
  221.             <artifactId>spring-boot-starter-rsocket</artifactId>
  222.             <version>2.4.7</version>
  223.           </dependency>
  224.           <dependency>
  225.             <groupId>org.springframework.boot</groupId>
  226.             <artifactId>spring-boot-starter-security</artifactId>
  227.             <version>2.4.7</version>
  228.           </dependency>
  229.           <dependency>
  230.             <groupId>org.springframework.boot</groupId>
  231.             <artifactId>spring-boot-starter-test</artifactId>
  232.             <version>2.4.7</version>
  233.           </dependency>
  234.           <dependency>
  235.             <groupId>org.springframework.boot</groupId>
  236.             <artifactId>spring-boot-starter-thymeleaf</artifactId>
  237.             <version>2.4.7</version>
  238.           </dependency>
  239.           <dependency>
  240.             <groupId>org.springframework.boot</groupId>
  241.             <artifactId>spring-boot-starter-tomcat</artifactId>
  242.             <version>2.4.7</version>
  243.           </dependency>
  244.           <dependency>
  245.             <groupId>org.springframework.boot</groupId>
  246.             <artifactId>spring-boot-starter-undertow</artifactId>
  247.             <version>2.4.7</version>
  248.           </dependency>
  249.           <dependency>
  250.             <groupId>org.springframework.boot</groupId>
  251.             <artifactId>spring-boot-starter-validation</artifactId>
  252.             <version>2.4.7</version>
  253.           </dependency>
  254.           <dependency>
  255.             <groupId>org.springframework.boot</groupId>
  256.             <artifactId>spring-boot-starter-web</artifactId>
  257.             <version>2.4.7</version>
  258.           </dependency>
  259.           <dependency>
  260.             <groupId>org.springframework.boot</groupId>
  261.             <artifactId>spring-boot-starter-webflux</artifactId>
  262.             <version>2.4.7</version>
  263.           </dependency>
  264.           <dependency>
  265.             <groupId>org.springframework.boot</groupId>
  266.             <artifactId>spring-boot-starter-websocket</artifactId>
  267.             <version>2.4.7</version>
  268.           </dependency>
  269.           <dependency>
  270.             <groupId>org.springframework.boot</groupId>
  271.             <artifactId>spring-boot-starter-web-services</artifactId>
  272.             <version>2.4.7</version>
  273.           </dependency>
  274.         </dependencies>
  275. </dependencyManagement>

那么在子模块中只需要<groupId>和<artifactId>即可，也就是我们创建springboot项目中

  1.  <dependency>
  2.             <groupId>org.springframework.boot</groupId>
  3.             <artifactId>spring-boot-starter-aop</artifactId>
  4.         </dependency>

使用dependencyManagement可以统一管理项目的版本号，确保应用的各个项目的依赖和版本一致，不用每个模块项目都弄一个版本号，不利于管理，当需要变更版本号的时候只需要在父类容器里更新，不需要任何一个子项目的修改；如果某个子项目需要另外一个特殊的版本号时，只需要在自己的模块dependencies中声明一个版本号即可。子类就会使用子类声明的版本号，不继承于父类版本号

dependencies标签

用于引入项目依赖

  1.   <dependencies>
  2.         <!--aop 切面-->
  3.         <dependency>
  4.             <groupId>org.springframework.boot</groupId>
  5.             <artifactId>spring-boot-starter-aop</artifactId>
  6.         </dependency>
  7.         <!--ip获取位置-->
  8.     </dependencies>

注意

Dependencies相对于dependencyManagement，所有生命在dependencies里的依赖都会自动引入，并默认被所有的子项目继承。

而dependencyManagement里只是声明依赖，并不自动实现引入，因此子项目需要显示的声明需要用的依赖。

如果不在子项目中声明依赖，是不会从父项目中继承下来的；只有在子项目中写了该依赖项，并且没有指定具体版本，才会从父项目中继承该项，并且version和scope都读取自父pom;另外如果子项目中指定了版本号，那么会使用子项目中指定的jar版本。

maven冲突解决

我们可以通过exclusions 标签过滤掉不需要的依赖

  1. <dependency>
  2.             <groupId>org.springframework.boot</groupId>
  3.             <artifactId>spring-boot-starter-web</artifactId>
  4.             <exclusions>
  5.                 <exclusion>
  6.                     <groupId>org.springframework.boot</groupId>
  7.                     <artifactId>spring-boot-starter-logging</artifactId>
  8.                 </exclusion>
  9.                 <exclusion>
  10.                     <groupId>org.springframework.boot</groupId>
  11.                     <artifactId>spring-boot-starter-tomcat</artifactId>
  12.                 </exclusion>
  13.             </exclusions>
  14.   </dependency>

maven打包和插件

下面列举的常用打包和插件

  1.  <!--打包-->
  2.     <build>
  3.        <resources>
  4.         <resource>
  5.             <filtering>true</filtering>
  6.             <directory>src/main/resources</directory>
  7.         </resource>
  8.     </resources>
  10.         <plugins>
  11.             <plugin>
  12.                 <groupId>org.apache.maven.plugins</groupId>
  13.                 <artifactId>maven-compiler-plugin</artifactId>
  14.                 <version>${maven.compiler.plugin.version}</version>
  15.                 <configuration>
  16.                     <source>${java.version}</source>
  17.                     <target>${java.version}</target>
  18.                     <encoding>${project.build.sourceEncoding}</encoding>
  19.                 </configuration>
  20.             </plugin>
  22.             <plugin>
  23.                 <groupId>org.apache.maven.plugins</groupId>
  24.                 <artifactId>maven-resources-plugin</artifactId>
  25.                 <version>${maven.resources.plugin.version}</version>
  26.                 <configuration>
  27.                     <encoding>${project.build.sourceEncoding}</encoding>
  28.                 </configuration>
  29.             </plugin>
  31.             <plugin>
  32.                 <groupId>org.apache.maven.plugins</groupId>
  33.                 <artifactId>maven-jar-plugin</artifactId>
  34.                 <version>${maven.jar.plugin.version}</version>
  35.             </plugin>
  37.            <!-- <plugin>
  38.                 <artifactId>maven-war-plugin</artifactId>
  39.                 <version>${maven-war-plugin.version}</version>
  40.                 <configuration> &lt;!&ndash; Exclude JCL and LOG4J since all logging should go through SLF4J. Note that we're excluding log4j-<version>.jar but keeping log4j-over-slf4j-<version>.jar &ndash;&gt;
  41.                     <packagingExcludes>
  42.                         WEB-INF/lib/hutool-setting.jar,
  43.                     </packagingExcludes>
  44.                 </configuration>
  45.             </plugin>-->
  47.             <plugin>
  48.                 <groupId>org.springframework.boot</groupId>
  49.                 <artifactId>spring-boot-maven-plugin</artifactId>
  50.                 <executions>
  51.                     <execution>
  52.                         <goals>
  53.                             <goal>repackage</goal><!--可以把依赖的包都打包到生成的Jar包中-->
  54.                         </goals>
  55.                     </execution>
  56.                 </executions>
  57.             </plugin>
  58.         </plugins>
  59.     </build>

Maven 基础标签之版本管理和冲突解决的更多相关文章

  1. 【java基础 10】hash算法冲突解决方法

    导读:今天看了java里面关于hashmap的相关源码(看了java6和java7),尤其是resize.transfer.put.get这几个方法,突然明白了,为什么我之前考数据结构死活考不过,就差 ...

  2. maven基础学习-为什么要用maven,帮助解决了什么问题，怎么解决的，希望以后学习每个知识点都可以这样问下自己

    maven基础学习 第1章 Maven介绍 1.1 什么是Maven 1.1.1 什么是Maven Maven 的正确发音是[ˈmevən],而不是"马瘟"以及其他什么瘟.Mave ...

  3. Maven 传递依赖冲突解决（了解）

    1 传递依赖冲突解决(了解) 传递依赖:A(项目)依赖B,B依赖C(1.1版本),B是A的直接依赖,C就是A的传递依赖 导入依赖D,D依赖C(1.2版本) 1.1 Maven自己调解原则 1.1.1  ...

  4. 彻底解决eslint与webstorm针对vue的script标签缩进处理方式冲突问题

    彻底解决eslint与webstorm针对vue的script标签缩进处理方式冲突问题 2018年12月08日 21:58:26 Kevin395 阅读数 1753   背景不多介绍了,直接上代码. ...

  5. Maven最佳实践：版本管理

    什么是版本管理 首先,这里说的版本管理(version management)不是指版本控制(version control),但是本文假设你拥有基本的版本控制的知识,了解subversion的基本用 ...

  6. Maven最佳实践：版本管理【转】

    什么是版本管理 首先,这里说的版本管理(version management)不是指版本控制(version control),但是本文假设你拥有基本的版本控制的知识,了解subversion的基本用 ...

  7. Maven基础知识详解

    1. 简介   Maven在Java领域的应用已经非常广泛了,有了Maven的存在是的开发人员在搭建.依赖.扩展和打包项目上变得非常简单. 2. Windows安装Maven 下载安装包   http ...

  8. Maven——基础篇

    Maven--基础篇 Maven出现前的问题 一个项目就是一个工程,而工程内一般是通过package包来分模块,比较用户模块,订单模块等,如果项目过于庞大,通过包模块来划分就不太合适,而应该拆分为模块 ...

  9. Git知识总览(三) 分支的创建、删除、切换、合并以及冲突解决

    前两篇博客集中的聊了git的一些常用命令,具体请参见<Git知识总览(一) 从 git clone 和 git status 谈起>.<Git知识总览(二) git常用命令概览> ...

随机推荐

  1. 29、windows下通过zip包方式安装mysql

    29.1.下载mysql: 1. www.mysql.com 2. 3. https://dev.mysql.com/downloads/mysql/ 4. 29.2.安装mysql数据库: 1.把下 ...

  2. 低代码Paas开发平台可以本地实施吗

    低代码Paas开发平台可以本地实施吗?答案是肯定的.虽然低代码开发通常是以云端形式面向用户,也就是我们经常看到到aPaaS,而它也更加倾向于SaaS.但实际上,低代码开发平台是可以支持本地部署的,例如 ...

  3. [心得体会]springmvc在requestbody注解下使用jackson转化日期格式

    使用WebMvcConfigurer的方法将converter注入到项目中 @Configurationpublic class ConverterConfig implements WebMvcCo ...

  4. 大数据-Hadoop 本地运行模式

    Grep案例 1. 创建在hadoop-2.7.2文件下面创建一个input文件夹 [atguigu@hadoop101 hadoop-2.7.2]$ mkdir input 2. 将Hadoop的x ...

  5. linux学习之路第九天（任务调度）

    crond 任务调度 概念 任务调度:是指的系统在某个时间执行的特定命令或程序. 比喻理解: 可以这样理解,比如生活中有闹钟,闹钟的作用是不是叫人起床的,那古时候没有闹钟,叫人起床的工作是不是要人去完 ...

  6. python多线程实现方式，最基础的实现方式模块是什么

    https://blog.csdn.net/daiyu__zz/article/details/81912018 python3.x中通过threading模块创建新的线程有两种方法:一种是通过thr ...

  7. 【故障公告】redis 服务器宕机引发博客站点故障

    非常抱歉,今天下午 17:10~17:40 左右,由于博客系统所使用的 redis 服务器宕机,造成博客站点无法正常访问,由此给您带来很大的麻烦,请您谅解. 我们会针对这次故障改进 redis 服务器 ...

  8. PHPCMSV9版本代码审计学习

    学习代码审计,自己简单记录一下.如有错误望师傅斧正. PHPCMS预备知识 PHPCMS是采用MVC设计模式开发,基于模块和操作的方式进行访问,采用单一入口模式进行项目部署和访问,无论访问任何一个模块 ...

  9. Qt绘图浅析与实例

    1. Qt5位置相关函数 Q提供了很多关于获取窗体位置及显示区域大小的函数,如x().y()和pos().rect().size().geometry()等,统称为"位置相关函数" ...

  10. Filter+Listener核心技术

    一.filter过滤器 javaweb三大组件:filter.listener.servlet. 过滤器是向web应用程序的请求和响应处理添加功能的web服务组件,可以在访问资源之前对请求和响应进行修 ...