Maven针对不同的环境使用Profile完成打包部署
??????以前用ant打包的时候处理就比较方便。打包前copy一下对应目录下的配置文件覆盖target下的那些文件，然后再打包就可以了。在刚开始用maven的时候就想要怎么解决，一直没有在Maven中找到ant的这种替代方式。其实主要是按ant这种处理方法去思考了，所以就只去想没有有copy这种target。
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2. 其实在maven中用profile可以更简单的解决。
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二、使用Maven的profile功能
1.配置pom.xml: 在pom.xml中配置dev, qa, prod三个配置文件为资源源文件，代表着3种环境下的配置文件。观看下面的pom.xml文件
????????????1） 在resource下指定<directory>src/main/resources</directory> 和<filtering>true</filtering>，<include>*.*</include>，意思是对src/main/resources目录下的所有文件（本例子中就是上面你看到的settings.properties文件）进行占位符替换。即用dev.properties或者是qa.properties, prod.properties的内容来替换settings.properties中的占位符。换句话说，就是我们在项目中实际上用的资源文件是settings.properties,而这个文件的内容有时是qa.properties,有时是dev.properties,有时是prod.properties。
????????????2） <activation> ... </activation>表示的是可以用这样的命令来触发profile，比如用
mvn clean install -DskipTests -Denv=qa, 表示出发qa的profile，也就是会用qa.properties文件来替换settings.properties.
??????????? 3) ... <activeByDefault>true</activeByDefault> ... 表示dev是默认的profile
即 mvn clean install -DskipTests -Denv=dev 等价于 mvn clean install -DskipTests
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<profiles>
????? <profile>
????????? <id>dev</id>
????????? <build>
????????????? <filters>
????????????????? <filter>src/main/resources/filters/dev.properties</filter>
????????????? </filters>
????????????? <resources>
????????????????? <resource>
????????????????????? <directory>src/main/resources</directory>
????????????????????? <filtering>true</filtering>
?????????????????????
????????????????????? <!-- optional -->
????????????????????? <includes>
????????????????????????? <include>*.*</include>
????????????????????? </includes>
?????????????????????
????????????????? </resource>
????????????? </resources>
????????? </build>
?????????
????????? <activation>
????????????? <activeByDefault>true</activeByDefault>
????????????? <property>
????????????????? <name>env</name>
????????????????? <value>dev</value>
????????????? </property>
????????? </activation>
????? </profile>
?????
????? <profile>
????????? <id>qa</id>
????????? <build>
????????????? <filters>
????????????????? <filter>src/main/resources/filters/qa.properties</filter>
????????????? </filters>
????????????? <resources>
????????????????? <resource>
????????????????????? <directory>src/main/resources</directory>
????????????????????? <filtering>true</filtering>
?????????????????????
????????????????????? <!-- optional -->
????????????????????? <includes>
????????????????????????? <include>*.*</include>
????????????????????? </includes>
?????????????????????
????????????????? </resource>
????????????? </resources>
????????? </build>
?????????
????????? <activation>
????????????? <property>
????????????????? <name>env</name>
????????????????? <value>qa</value>
????????????? </property>
????????? </activation>
????? </profile>
?????
????? <profile>
????????? <id>prod</id>
????????? <build>
????????????? <filters>
????????????????? <filter>src/main/resources/filters/prod.properties</filter>
????????????? </filters>
????????????? <resources>
????????????????? <resource>
????????????????????? <directory>src/main/resources</directory>
????????????????????? <filtering>true</filtering>
?????????????????????
????????????????????? <!-- optional -->
????????????????????? <includes>
????????????????????????? <include>*.*</include>
????????????????????? </includes>
?????????????????????
????????????????? </resource>
????????????? </resources>
????????? </build>
?????????
????????? <activation>
????????????? <property>
????????????????? <name>env</name>
????????????????? <value>prod</value>
????????????? </property>
????????? </activation>
????? </profile>
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? </profiles>
?2.? 配置qa.properties, dev.properties, prod.properties.以及settings.properties.
1) settings.properteis:
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CMSDB_ENDPOINT=${CMSDB_ENDPOINT}
2) qa.properties:
CMSDB_ENDPOINT=http://phx5qa01c-5fca.stratus.phx.qa.xx.com:8080/cms
3) dev.properties:
CMSDB_ENDPOINT=http://localhost:8080/cms
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4) prod.properties:
CMSDB_ENDPOINT=http://cms.vip.stratus.xx.com/cms
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3. 使用下面的命令，然后查看settings.xml的内容。
mvn clean install -DskipTests
mvn clean install -DskipTests -Denv=qa
mvn clean install -DskipTests -Denv=prod
你会发现settings中的内容会根据你所执行命令的不同而不同，这正是我们所需要的。
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