profile的介绍和使用

同一个项目使用同一个pom.xml来构建不同的环境时候，比如：本地环境(local)日志输出目录：D:/logs/record/record.log，而测试环境(test)日志输出目录：/home/gxx/logs/record/record.log；又比如：本地环境(local)使用数据源1，而测试环境(test)使用数据源2。

<!-- 使用 mvn clean install -P XXX 激活profile -->
<profiles>
	<profile>
		<id>local</id>
		<activation>
			<activeByDefault>true</activeByDefault>
		</activation>
		<properties>
			<deploy.environment.include>local</deploy.environment.include>
			<deploy.environment.exclude>test</deploy.environment.exclude>
			<log4j.dir>D:/logs/record/record.log</log4j.dir>
		</properties>
	</profile>
	<profile>
		<id>test</id>
		<properties>
			<deploy.environment.include>test</deploy.environment.include>
			<deploy.environment.exclude>local</deploy.environment.exclude>
			<log4j.dir>/home/gxx/logs/record/record.log</log4j.dir>
		</properties>
	</profile>
</profiles>

其中两个profile表示两个环境，local为本地环境，test为测试环境，<activeByDefault>true</activeByDefault>表示默认环境，<properties>内的值为相应环境下配置的值，不管在properties或者xml或者pom.xml中都可以取出这些值，取的方法是：${属性值}，比如${deploy.environment.exclude}和${log4j.dir}，具体用法如下：

• 拷贝资源时候过滤application-${deploy.environment.exclude}-profile.xml配置文件，对于local则过滤application-test-profile.xml，对于test则过滤application-local-profile.xml

<!-- 拷贝资源 -->
<resources>
	<resource>
		<directory>src/main/resources</directory>
		<filtering>true</filtering>
		<excludes>
			<exclude>**/application-${deploy.environment.exclude}-profile.xml</exclude>
		</excludes>
	</resource>
	<resource>
           <directory>src/main/java</directory>
           <includes>
               <include>**</include>
           </includes>
           <excludes>
               <exclude>**/*.java</exclude>
           </excludes>
       </resource>
</resources>

• 配置log4j日志输出目录${log4j.dir}，对于local则目录为D:/logs/record/record.log，对于test则目录为/home/gxx/logs/record/record.log

#RollingFile滚动日志
log4j.appender.RollingFile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.RollingFile.File=${log4j.dir}
log4j.appender.RollingFile.layout=org.apache.log4j.PatternLayout
log4j.appender.RollingFile.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n

mvn clean install #默认local
#因为id为local的profile中配置<activation> <activeByDefault>true</activeByDefault> </activation>
mvn clean install -P local #选择本地环境
mvn clean install -P test #选择test环境