<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.6.0</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
                <encoding>UTF-8</encoding>
                                     <!--根據你把lib放的位置-->
                <compilerArguments>
                    <extdirs>${project.basedir}/src/main/resources/lib</extdirs>
                </compilerArguments>
            </configuration>
        </plugin>
    </plugins>
</build>