maven父子工程中的依賴引用的實現(xiàn)
簡述
項目越來越趨向模塊化開發(fā),使用maven構建工程,必然涉及到父子pom的關聯(lián),父pom文件的父級又會繼承springboot項目,就這樣在開發(fā)中踩坑不少,簡單記錄一下。
看問題之前先了解maven中的兩個標簽<dependencyManagement>和<dependencies>,明白的直接跳過。
maven標簽
1、<dependencyManagement>這里其實是起到管理依賴jar版本號的作用,一般只會在項目的最頂層的pom.xml中使用到,所有子module如果想要使用到這里面聲明的jar,只需要在子module中添加相應的groupId和artifactId即可,并不需要聲明版本號,需要注意的是這里面只是聲明一個依賴,并不是真實的下載jar,只有在子module中使用到,才會去下載依賴。
2、<dependencies>我們是這里引入了一個jar包之后,這里如果沒有加上version版本號的話,那么maven就會去<dependencyManagement>里找對應groupId和artifactId的jar,如果有就繼承他,如果沒有就會報錯,這時候其實在我們配置的本地倉庫中會真實的下載對應的jar包,這時候所有的子module都會默認繼承這里面所有聲明的jar。
總的來說,就是在中聲明依賴和版本號,該標簽中的依賴不會被子模塊繼承,僅僅是聲明,子pom中直接引入依賴,具體的版本號會在父子中去找。
父pom的packaging都是pom,子項目pom的packaging都是jar。關于在父子配置pom的引用有兩種方案,這里以springboot項目為例說明問題。
第一種pom配置
我們希望在父pom中引入相關依賴,都記錄在<dependencies>下,子模塊直接繼承父pom的依賴,在子模塊中開發(fā)中就不必再去引入依賴,但在項目中有模塊可能就是單一的工具包,它并不需要springboot的依賴,這時候啟動就會沖突??梢赃@樣解決,在父pom中定義springboot版本號,子模塊作為項目啟動的模塊配置springboot插件依賴,普通的dao,serivce,common不必引入。如下配置文件,文件中只列舉個別依賴包,重在說明問題:
父pom.xml配置:
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.demo</groupId>
<artifactId>demo-api</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<modules>
<module>demo-web</module>
<module>demo-common</module>
<module>demo-service</module>
</modules>
<properties>
<spring-boot.version>2.1.8.RELEASE</spring-boot.version>
<java.version>1.8</java.version>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<fastjson.version>1.2.47</fastjson.version>
<pagehelper.version>5.1.6</pagehelper.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>${spring-boot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<!--這兩個依賴都將被子模塊繼承-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>${fastjson.version}</version>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>${pagehelper.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>8</source>
<target>8</target>
</configuration>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>dev</id>
<properties>
<package.environment>dev</package.environment>
</properties>
<!-- 是否默認 true表示默認-->
<activation>
<activeByDefault>true</activeByDefault>
</activation>
</profile>
<profile>
<!-- 測試環(huán)境 -->
<id>test</id>
<properties>
<package.environment>test</package.environment>
</properties>
</profile>
<profile>
<!-- 生產(chǎn)環(huán)境 -->
<id>prod</id>
<properties>
<package.environment>prod</package.environment>
</properties>
</profile>
</profiles>
</project>
普通子模塊pom.xml配置:
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>demo-api</artifactId>
<groupId>com.demo</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.demo.common</groupId>
<artifactId>demo-common</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo-common</name>
<description>demo-common project</description>
<packaging>jar</packaging>
</project>
啟動類子模塊pom.xml配置:
<?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>
<parent>
<groupId>com.demo</groupId>
<artifactId>demo-api</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<groupId>com.demo.web</groupId>
<artifactId>demo-web</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo-web</name>
<description>demo-web project</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<!--引入子模塊相關jar -->
<dependency>
<groupId>com.demo.common</groupId>
<artifactId>demo-common</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.myway.service</groupId>
<artifactId>share-read-service</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<!--重要 如果不設置resource 會導致application.yaml中的@@找不到pom文件中的配置-->
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<!--僅在啟動項目中引入springboot插件 -->
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
第二種pom配置
將所有的依賴在父pom的中聲明,子模塊把需要的都引入一遍:
父pom.xml配置:
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.demo</groupId>
<artifactId>demo</artifactId>
<version>3.0.0</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<druid.version>1.1.14</druid.version>
<pagehelper.boot.version>1.2.5</pagehelper.boot.version>
<fastjson.version>1.2.70</fastjson.version>
</properties>
<!-- 依賴聲明 -->
<dependencyManagement>
<dependencies>
<!-- SpringBoot的依賴配置-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.1.8.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!--阿里數(shù)據(jù)庫連接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>${druid.version}</version>
</dependency>
<!-- pagehelper 分頁插件 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>${pagehelper.boot.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
<modules>
<module>demo-web</module>
<module>demo-common</module>
</modules>
<packaging>pom</packaging>
<dependencies>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<encoding>${project.build.sourceEncoding}</encoding>
</configuration>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>public</id>
<name>aliyun nexus</name>
<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
<releases>
<enabled>true</enabled>
</releases>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>public</id>
<name>aliyun nexus</name>
<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
<releases>
<enabled>true</enabled>
</releases>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
<profiles>
<profile>
<id>dev</id>
<properties>
<package.environment>dev</package.environment>
</properties>
<!-- 是否默認 true表示默認-->
<activation>
<activeByDefault>true</activeByDefault>
</activation>
</profile>
<profile>
<!-- 測試環(huán)境 -->
<id>test</id>
<properties>
<package.environment>test</package.environment>
</properties>
</profile>
<profile>
<!-- 生產(chǎn)環(huán)境 -->
<id>prod</id>
<properties>
<package.environment>prod</package.environment>
</properties>
</profile>
</profiles>
</project>
普通子模塊pom.xml配置:
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>demo</artifactId>
<groupId>com.demo</groupId>
<version>1.0.0</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>demo-system</artifactId>
<dependencies>
<dependency>
<groupId>com.demo</groupId>
<artifactId>demo-common</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
</dependency>
</dependencies>
</project>
啟動類子模塊pom.xml配置:
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<artifactId>demo</artifactId>
<groupId>com.demo</groupId>
<version>3.0.0</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<packaging>jar</packaging>
<artifactId>demo-admin</artifactId>
<description>
web服務
</description>
<dependencies>
<dependency>
<artifactId>demo</artifactId>
<groupId>com.demo</groupId>
<version>1.0.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.1.8.RELEASE</version>
<configuration>
<fork>true</fork> <!-- 如果沒有該配置,devtools不會生效 -->
</configuration>
<executions>
<execution>
<goals>
<goal>repackage</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
<warName>${project.artifactId}</warName>
</configuration>
</plugin>
</plugins>
</build>
</project>
以上是個人在構建項目中總結出來的,可供參考,重在理解。
到此這篇關于maven父子工程中的依賴引用的實現(xiàn)的文章就介紹到這了,更多相關maven父子工程依賴引用內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關文章希望大家以后多多支持腳本之家!
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