maven parent中的dependencies和dependencyManagement区别

r囧r小猫 2022-08-01 11:13 233阅读 0赞

首先，写一个maven parent

<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.lala</groupId>
    	<artifactId>my-parent</artifactId>
    	<version>0.0.1</version>
    	<packaging>pom</packaging>
    
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>junit</groupId>
    			<artifactId>junit</artifactId>
    			<version>4.11</version>
    			<scope>test</scope>
    		</dependency>
    		<dependency>
    			<groupId>redis.clients</groupId>
    			<artifactId>jedis</artifactId>
    			<version>2.4.0</version>
    			<scope>provided</scope>
    		</dependency>
    	</dependencies>
    
    	<dependencyManagement>
    		<dependencies>
    			<dependency>
    				<groupId>javax.mail</groupId>
    				<artifactId>javax.mail-api</artifactId>
    				<version>1.5.3</version>
    				<scope>provided</scope>
    			</dependency>
    		</dependencies>
    	</dependencyManagement>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.apache.maven.plugins</groupId>
    				<artifactId>maven-compiler-plugin</artifactId>
    				<version>3.3</version>
    				<configuration>
    					<source>1.8</source>
    					<target>1.8</target>
    					<verbose>true</verbose>
    				</configuration>
    			</plugin>
    		</plugins>
    	</build>
    </project>

dependencies里面的依赖是：2.4.0的jedis

dependencyManagement里面的依赖是：1.5.3的java.mail

子模块这样写的话

<parent>
    		<groupId>com.lala</groupId>
    		<artifactId>my-parent</artifactId>
    		<version>0.0.1</version>
    	</parent>

会有如下反应：

1：子模块会自动引入父模块的dependencies依赖，而不会自动引入dependencyManagement的依赖

2：dependencyManagement里只是声明依赖，并不实现引入，因此子项目需要显式的声明需要用的依赖，而且不需要指定version、scope，系统会自动用父模块的version、scope

maven技术交流 扣扣群  379165311，群里面会不定期分享一些maven文章和教程，欢迎大家加入