Maven统一版本管理的实现

<properties>
<!--定义好版本号-->
		<revision>1.0-SNAPSHOT</revision>
	</properties>
<!--使用revision作为版本号传递-->
			<plugin>
				<groupId>org.codehaus.mojo</groupId>
				<artifactId>flatten-maven-plugin</artifactId>
				<version>1.2.4</version>
				<configuration>
					<!-- 避免IDE将 .flattened-pom.xml 自动识别为功能模块 -->
					<updatePomFile>true</updatePomFile>
					<flattenMode>resolveCiFriendliesOnly</flattenMode>
				</configuration>
				<executions>
					<execution>
						<id>flatten</id>
						<phase>process-resources</phase>
						<goals>
							<goal>flatten</goal>
						</goals>
					</execution>
					<execution>
						<id>flatten.clean</id>
						<phase>clean</phase>
						<goals>
							<goal>clean</goal>
						</goals>
					</execution>
				</executions>
			</plugin>

<parent>
		<groupId>xxx.xxx.xxx</groupId>
		<artifactId>A</artifactId>
		<version>${revision}</version>
	</parent>

<parent>
		<groupId>xxx.xxx.xxx</groupId>
		<artifactId>B</artifactId>
		<version>${revision}</version>
	</parent>