Maven —— 依赖管理

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Maven提供的dependencyManagement元素既能让子模块集成到父模块的依赖配置，又能保证子模块依赖使用的灵活性。在dependencyManagement元素下的依赖声明不会引入实际的依赖，不过他能够约束dependencies下的依赖使用。

例如

<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.test</groupId>
    <artifactId>a</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>pom</packaging>
    <name>a</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>junit<groupId>
                <artifactId>junit</artifactId>
                <version>{junit.version}</version>
                <scope>test</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

子工程引用所需要的父工程jar包：

        <dependencies>
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-core</artifactId>
                <version>${springframework.version}</version>
            </dependency>
            <dependency>
                <groupId>junit<groupId>
                <artifactId>junit</artifactId>
                <version>{junit.version}</version>
                <scope>test</scope>
            </dependency>
        </dependencies>