SpringBOOT專案在線上部署時，要麼在命令列裡新增–spring.profiles.active=prod來指定環境，要麼通過maven 打包時動態傳參啟用–spring.profiles.active=prod,之前對於SpringBOOT的專案部署都是採用命令列方式啟用環境分支，現專案整合部署環境，採用的maven -p方式啟用環境分支，需將啟用的分支變數傳遞給
spring.profiles.active=prod

plugin指定maven打包時需要取得引數，根據引數來設定打包的環境的配置檔案
另外需要建一個application.yml檔案指定啟動檔案環境
application.yml方式配置如下：

spring:
  profiles:
    active: @profileActive@

<profiles>
        <profile>
            <id>product</id>
            <properties>
                <profileActive>prod</profileActive>
            </properties>
        </profile>
    </profiles>
 

    <build>
        <resources>
            <resource> <!-- 配置需要被替換的資原始檔路徑, properties 應該在 src/main/resource 目錄下 -->
                <directory>src/main/resources</directory>
                <excludes>
                    <exclude>static/**</exclude>
                </excludes
 
>
                <filtering>true</filtering> <!-- 是否使用過濾器 -->
            </resource>
        </resources>
    </build>

傳統的maven 專案在對配置檔案中進行佔位符替換時，如下開啟對某個目錄下的檔案過濾替換就行，配置檔案中佔位符為${…},但是在SpringBOOT專案中，配置檔案要想從maven中獲取環境變數，佔位符得是@…@

    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

13.2 Maven 
Maven users can inherit from the spring-boot-starter-parent project to obtain sensible defaults. The parent project provides the following features:

Java 1.6 as the default compiler level. 
UTF-8 source encoding. 
A Dependency Management section, allowing you to omit tags for common dependencies, inherited from the spring-boot-dependencies POM. 
Sensible resource filtering. 
Sensible plugin configuration (exec plugin, surefire, Git commit ID, shade). 
Sensible resource filtering for application.properties and application.yml including profile-specific files (e.g. application-foo.properties and application-foo.yml) 
On the last point: since the default config files accept Spring style placeholders (${…​}) the Maven filtering is changed to use @[email protected] placeholders (you can override that with a Maven property resource.delimiter).

大致的意思是我的maven繼承了spring-boot-starter-parent，並且spring預設配置檔案接受的佔位符也是…，所以mavenfilter{}佔位符就被spring的maven pom替換掉了，變成了@[email protected]，我們可以通過resource.delimiter來覆蓋它。
看下spring-boot-starter-parent 這個pom裡寫這一段

<properties>
        <java.version>1.6</java.version>
        <resource.delimiter>@</resource.delimiter> <!-- delimiter that doesn't clash with Spring ${} placeholders -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <maven.compiler.source>${java.version}</maven.compiler.source>
        <maven.compiler.target>${java.version}</maven.compiler.target>
    </properties>

總結：所以Springboot 專案在啟動時要麼採用命令列方式啟用，也可以採用mavan 打包傳遞引數啟用，更多啟用方式可以檢視SpringBOOT的配置優先順序可以參考 SpringBoot系列(三)內建配置及自定義配置