配置文件加载属性

maven_01_parent|--|pom.xml

<parent>
    <!--定义属性-->
    <properties>
        <spring.version>5.2.10.RELEASE</spring.version>
        <jdbc.url>jdbc:mysql://127.0.0.1:3306/ssm_db</jdbc.url>
    </properties>

    <build>
        <resources>
            <resource>
                <!--<directory>../maven_02_ssm/src/main/resources</directory>-->
                <directory>${project.basedir}/src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>
</parent>

maven_02_ssm|--|jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=${jdbc.url}
jdbc.username=root
jdbc.password=root

maven_02_ssm|--|pom.xml

<parent>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.1</version>
                <configuration>
                    <port>80</port>
                    <path>/</path>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.2.3</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
        </plugins>
    </build>
</parent>