Maven依赖管理_JAVA_编程开发_程序员俱乐部

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Maven提供dependencyManagement?元素既能让子模块继承到父模块的依赖配置，又能保证自模块依赖的使用灵活性。（有选择的继承）

可在accout-parent?中加入：

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<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.juvenxu.mvnbook.account</groupId>
	<artifactId>account-parent</artifactId>
	<version>1.0.0-SNAPSHOT</version>
	<packaging>pom</packaging>
	<name>Account Parent</name>
	<properties>
		<springframework.version>2.5.6</springframework.version>
		<junit.version>4.7</junit.version>
	</properties>
	< dependencyManagement >
		<dependencies>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-core</artifactId>
				<version>${springframework.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-beans</artifactId>
				<version>${springframework.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-context</artifactId>
				<version>${springframework.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-context-support</artifactId>
				<version>${springframework.version}</version>
			</dependency>
			<dependency>
				<groupId>junit</groupId>
				<artifactId>junit</artifactId>
				<version>${junit.version}</version>
				<scope>test</scope>
			</dependency>
		</dependencies>
	</ dependencyManagement >
</project>

?子模块继承代码如下：

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<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	
	< parent >
		<groupId>com.juvenxu.mvnbook.account</groupId>
		<artifactId> account-parent </artifactId>
		<version>1.0.0-SNAPSHOT</version>
	</ parent >
	
	<artifactId>account-email</artifactId>
	<name>Account Email</name>

	<properties>
		<javax.mail.version>1.4.1</javax.mail.version>
		<greenmail.version>1.3.1b</greenmail.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-core</artifactId>                             
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>                                          
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>                                       
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context-support</artifactId>                                       
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
		</dependency>
		<dependency>
			<groupId>javax.mail</groupId>
			<artifactId>mail</artifactId>
			<version>${javax.mail.version}</version>
		</dependency>                   
		<dependency>
			<groupId>com.icegreen</groupId>
			<artifactId>greenmail</artifactId>
			<version>${greenmail.version}</version>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
	</build>

</project>

1、代码量减少，不用多次重复声明?version等元素。

2、version受父管理，父变则子变，便于修改。

3、dependencyManagement一旦定义，可以复用。

<dependencyManagement>
	<dependencies>
		<dependency>
			<groupId>com.juvenxu.mvnbook.account</groupId>
			<artifactId> account-parent </artifactId>
			<version>1.0-SNAPSHOT</version>
			<type>pom</type>
			<scope>import</scope>
		</dependency>
	</dependencies>
</dependencyManagement>