Maven 中的 profile

• Maven 中有一個概念叫做：?profile?，它的誕生主要是為了解決不同環(huán)境所需的不同變量、配置等問題。
• 有了 ?profile?，可以根據(jù)激活的條件，啟動不同條件下的配置信息。
• ?profile ?是可以有多個的，也可以同時激活多個 ?profile?，方便自由組合。
• ?profile? 一般可以在三個地方：?settings.xml?，?pom.xml?，?profiles.xml?（這個不常用）
• 在 ?settings.xml? 上，一般大家用來做倉庫的選擇，比如以下? settings.xml ?代碼：

<?xml version="1.0" encoding="UTF-8"?>

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">

    <localRepository>D:\maven\my_local_repository</localRepository>

    <pluginGroups>
    </pluginGroups>

    <proxies>
    </proxies>

    <profiles>
        <profile>
            <id>nexus</id>
            <repositories>
                <repository>
                    <id>nexus</id>
                    <url>http://192.168.1.73:8081/repository/maven-public/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </repository>
            </repositories>
            <pluginRepositories>
                <pluginRepository>
                    <id>nexus</id>
                    <url>http://192.168.1.73:8081/repository/maven-public/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </pluginRepository>
            </pluginRepositories>
        </profile>
        <profile>
            <id>aliyun</id>
            <repositories>
                <repository>
                    <id>aliyun</id>
                    <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </repository>
            </repositories>
            <pluginRepositories>
                <pluginRepository>
                    <id>aliyun</id>
                    <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
                    <releases>
                        <enabled>true</enabled>
                    </releases>
                    <snapshots>
                        <enabled>true</enabled>
                    </snapshots>
                </pluginRepository>
            </pluginRepositories>
        </profile>
    </profiles>

    <activeProfiles>
        <activeProfile>nexus</activeProfile>
    </activeProfiles>

</settings>

• 以上代碼中 ?profile? 就做一件事：設置全局的 ?profile?，一個是 ?nexus ?倉庫，一個是 ?aliyun ?倉庫，默認激活的是 nexus 倉庫。（?activeProfiles?）
• 在 ?pom.xml ?中，一般用來激活環(huán)境配置，比如以下代碼：

<profiles>
    <profile>
        <id>dev</id>
        <properties>
            <package.environment>dev</package.environment>
        </properties>
        <activation>
            <activeByDefault>true</activeByDefault>
        </activation>
        <build>
            <resources>
                <resource>
                    <directory>src/main/resources</directory>
                    <includes>
                        <include>**/*</include>
                    </includes>
                    <filtering>true</filtering>
                </resource>
                <resource>
                    <directory>src/main/env/${package.environment}</directory>
                    <includes>
                        <include>**/*</include>
                    </includes>
                    <filtering>true</filtering>
                </resource>
            </resources>
            <finalName>${project.artifactId}</finalName>
        </build>
    </profile>
    <profile>
        <id>product</id>
        <properties>
            <package.environment>product</package.environment>
        </properties>
        <activation>
            <activeByDefault>false</activeByDefault>
        </activation>
        <build>
            <resources>
                <resource>
                    <directory>src/main/resources</directory>
                    <includes>
                        <include>**/*</include>
                    </includes>
                    <filtering>true</filtering>
                </resource>
                <resource>
                    <directory>src/main/env/${package.environment}</directory>
                    <includes>
                        <include>**/*</include>
                    </includes>
                    <filtering>true</filtering>
                </resource>
            </resources>
            <finalName>${project.artifactId}</finalName>
        </build>
    </profile>
</profiles>

• 以上代碼中 ?profile ?就做一件事：打包的時候，默認是 ?dev ?模式，打包 ?src/main/env/dev? 下的配置文件，如果選擇 ?product? 則打包 ?src/main/env/product? 下的配置文件。