springboot项目docker分层构建的配置方式

<properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <docker.plugin.version>0.43.4</docker.plugin.version>
        <docker.registry>reg.harborXXX.com</docker.registry>
        <docker.namespace>order</docker.namespace>
    </properties>
	<build>
        <finalName>order-xxx</finalName>
        <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>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>io.fabric8</groupId>
                <artifactId>docker-maven-plugin</artifactId>
                <version>${docker.plugin.version}</version>
                <configuration>
                    <registry>${docker.registry}</registry>
                    <images>
                        <image>
                        	<name>${docker.registry}/${docker.namespace}/${project.build.finalName}:${project.version}</name>
                            <build>
                                <dockerFileDir>${project.basedir}</dockerFileDir>
                            </build>
                        </image>
                    </images>
                </configuration>
            </plugin>
        </plugins>
    </build>

# 分层构建, 加速增量构建
# 需配置host：{IP} reg.harborXXX.com
FROM reg.harborXXX.com/library/openjdk:8-ub as builder
WORKDIR app
ARG JAR_FILE=target/*.jar
COPY ${JAR_FILE} app.jar
RUN java -Djarmode=layertools -jar app.jar extract && rm app.jar
FROM reg.harborXXX.com/library/openjdk:8-ub
ENV TZ=Asia/Shanghai
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
ENV JAVA_OPTS=" -server -Xmx1024m -Xms256m -Xmn512m -Xss256k"
WORKDIR app
COPY --from=builder /app/dependencies/ ./
COPY --from=builder /app/spring-boot-loader/ ./
COPY --from=builder /app/snapshot-dependencies/ ./
COPY --from=builder /app/application/ ./
EXPOSE 9091
ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS org.springframework.boot.loader.JarLauncher"]