maven parent中的dependencies和dependencyManagement区别

首先，写一个maven parent

<project xmlns="" xmlns:xsi=""xsi:schemaLocation=" 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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