创建一个maven的springboot项目:
pom.xml如下:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.pp.test</groupId>
<artifactId>properties-test</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>properties-test</name>
<url>http://maven.apache.org</url>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<build>
<filters>
<filter>src/main/profiles/profile-${profiles.active}.properties</filter>
</filters>
<resources>
<resource>
<filtering>true</filtering>
<directory>src/main/resources</directory>
</resource>
</resources>
</build>
<profiles>
<profile>
<id>dev</id>
<properties>
<profiles.active>dev</profiles.active>
</properties>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
</profile>
<profile>
<id>test</id>
<properties>
<profiles.active>test</profiles.active>
</properties>
</profile>
<profile>
<id>prod</id>
<properties>
<profiles.active>prod</profiles.active>
</properties>
</profile>
</profiles>
</project>
application.properties如下:
jdbc.driverClassName=${jdbc.driverClassName}
jdbc.url=${jdbc.url}
jdbc.username=${jdbc.username}
jdbc.password=${jdbc.password}
profile-dev.properties 文件内容:
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:///db_users
jdbc.username=root
jdbc.password=root
使用mvn package -Pdev 打包后,application.propertes文件中内容没有被替换。
filtering无效的原因是,pom.xml继承了spring boot的依赖
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent>
点开这个依赖的pom.xml,我们发现
spring boot把默认的占位符号${}改成了@
找到原因了,那怎么解决就很简单了。
方法一:
在pom.xml里面添加如下内容
<properties>
<resource.delimiter>${}</resource.delimiter>
</properties>
方法二:
application.properties里面不用${},改成@
jdbc.driverClassName= .driverClassName
jdbc.url= .url
jdbc.username= .username
jdbc.password= .password
方法三:
pom.xml不继承spring-boot-starter-parent,dependency里面配置全部的依赖和版本号(继承了之后,很多依赖不用写version)
方法四:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent>
改成:
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>1.5.9.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>