maven parent中的dependencies和dependencyManagement区别

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

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