微服务框架（九）Spring Boot 通用Dubbo Parent POM-阿里云开发者社区

　　此系列文章将会描述Java框架Spring Boot、服务治理框架Dubbo、应用容器引擎Docker，及使用Spring Boot集成Dubbo、Mybatis等开源框架，其中穿插着Spring Boot中日志切面等技术的实现，然后通过gitlab-CI以持续集成为Docker镜像。
　　本文为通用Dubbo Maven POM的集成，只需继承Parent POM即可使用

本系列文章中所使用的框架版本为Spring Boot 2.0.3-RELEASE，Spring 5.0.7-RELEASE，Dubbo 2.6.2。

通用Dubbo POM

为了封装项目间通用的依赖及配置，Maven使用POM Reference来解决这个问题，通过定义Parent POM供子类POM继承，即可实现“一处申明，多处使用”的目的。

Maven POM 中可继承元素见POM Reference 或 Maven POM元素继承

dubbo通用POM通过以下配置引用

<parent>
    <groupId>com.test</groupId>
    <artifactId>dubbo.common.pom</artifactId>
    <version>${version}</version>
</parent>

自定义的Maven属性

maven参数

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<nexus.url>N/A</nexus.url>

dubbo依赖版本

<dubbo.version>2.6.2</dubbo.version>
<disruptor.version>3.3.6</disruptor.version>
<netty.version>4.0.35.Final</netty.version>
<spring.version>5.0.7.RELEASE</spring.version>
<springboot.version>2.0.3.RELEASE</springboot.version>
<dubbo.springboot.version>0.2.0</dubbo.springboot.version>
<kryo.version>4.0.1</kryo.version>
<kryo-serializers.version>0.42</kryo-serializers.version>

项目的部署配置

<distributionManagement>
    <repository>
        <id>maven-releases</id>
        <name>Nexus Release Repository</name>
        <url>http://${nexus.url}/repository/maven-releases/</url>
    </repository>
    <snapshotRepository>
        <id>maven-snapshots</id>
        <name>Nexus Snapshot Repository</name>
        <url>http://${nexus.url}/repository/maven-snapshots/</url>
    </snapshotRepository>
</distributionManagement>

项目的依赖

dubbo通用的项目依赖，主要包括dubbo、spring boot、mybatis等起步依赖及dubbo相关的性能调优依赖

项目必须继承的依赖

groupId	artifactId	version	scope(默认为compile)	description
junit	junit	4.12	test	单元测试
com.alibaba.boot	dubbo-spring-boot-starter	2.6.2		dubbo-spring-boot启动器
org.springframework	spring-context	5.0.7.RELEASE		spring上下文
org.springframework.boot	spring-boot-starter-log4j2	2.0.3.RELEASE		spring-boot log4j2
com.lmax	disruptor	3.3.6		log4j2日志异步化
io.netty	netty-all	4.0.35.Final		dubbo集成netty4
org.springframework.boot	spring-boot-starter-web	2.0.3.RELEASE		spring-boot web
org.springframework.boot	org.spring-boot-actuator	2.0.3.RELEASE		spring-boot actuator
org.springframework.boot	spring-boot-starter-test	2.0.3.RELEASE		spring-boot test
org.springframework.boot	spring-boot-starter-aop	2.0.3.RELEASE		spring-boot aop

<dependencies>
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.12</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>com.alibaba.boot</groupId>
    <artifactId>dubbo-spring-boot-starter</artifactId>
    <version>${dubbo.springboot.version}</version>
    <exclusions>
        <exclusion>
            <artifactId>spring-boot-starter-logging</artifactId>
            <groupId>org.springframework.boot</groupId>
        </exclusion>
    </exclusions>
</dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context</artifactId>
    <version>${spring.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-log4j2</artifactId>
    <version>${springboot.version}</version>
</dependency>

<dependency>
    <groupId>com.lmax</groupId>
    <artifactId>disruptor</artifactId>
    <version>${disruptor.version}</version>
</dependency>

<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>${netty.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>${springboot.version}</version>
    <exclusions>
        <exclusion>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <groupId>org.springframework.boot</groupId>
        </exclusion>
    </exclusions>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-actuator</artifactId>
    <version>${springboot.version}</version>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <version>${springboot.version}</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
    <version>${springboot.version}</version>
</dependency>

项目可选继承的依赖

groupId	artifactId	version	description
org.mybatis.spring.boot	mybatis-spring-boot-starter	1.3.2	springboot集成mybatis
org.springframework.boot	spring-boot-starter-jdbc	2.0.3.RELEASE	spring-boot jdbc
org.springframework.boot	spring-boot-autoconfigure	2.0.3.RELEASE	spring-boot autoconfigure
mysql	mysql-connector-java	5.1.24	mysql
com.github.pagehelper	pagehelper-spring-boot-starter	1.2.5	分页
com.alibaba	druid-spring-boot-starter	1.1.10	springboot集成druid
com.esotericsoftware	kryo	4.0.1	kryo实现
de.javakaffee	kryo-serializers	0.42	kryo序列化

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>${mybatis.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>spring-boot-starter-logging</artifactId>
                    <groupId>org.springframework.boot</groupId>
                </exclusion>
                <exclusion>
                    <artifactId>spring-boot-starter</artifactId>
                    <groupId>org.springframework.boot</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
            <version>${springboot.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>spring-boot-starter</artifactId>
                    <groupId>org.springframework.boot</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
            <version>${springboot.version}</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>

        <!-- 分页插件 -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>${pagehelper.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>spring-boot-starter</artifactId>
                    <groupId>org.springframework.boot</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- alibaba的druid数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>${druid.version}</version>
        </dependency>

        <!-- kyro序列化依赖 -->
        <dependency>
            <groupId>com.esotericsoftware</groupId>
            <artifactId>kryo</artifactId>
            <version>${kryo.version}</version>
        </dependency>
        <dependency>
            <groupId>de.javakaffee</groupId>
            <artifactId>kryo-serializers</artifactId>
            <version>${kryo-serializers.version}</version>
        </dependency>
    </dependencies>
</dependencyManagement>

build构建属性

包括项目的源码目录配置、输出目录配置、插件配置、插件管理配置等

项目输出目录配置

<resources>
    <!--recources文件夹下的所有文件都打进jar包 -->
    <resource>
        <targetPath>${project.build.directory}/classes</targetPath>
        <directory>src/main/resources</directory>
        <filtering>true</filtering>
        <includes>
            <include>**/*.xml</include>
            <include>**/*.properties</include>
            <include>**/*.json</include>
            <include>**/*.yml</include>
            <include>META-INF/dubbo/*</include>
        </includes>
    </resource>

    <!-- 满足docker-maven-plugin的约定:将 dockerfile文件拷贝到docker目录下 -->
    <resource>
        <targetPath>${project.build.directory}/docker</targetPath>
        <directory>src/main/resources/docker</directory>
        <filtering>true</filtering>
        <includes>
            <include>Dockerfile</include>
            <include>.dockerignore</include>
        </includes>
    </resource>
</resources>

插件管理配置

<pluginManagement><!-- lock down plugins versions to avoid using Maven 
        defaults (may be moved to parent pom) -->
    <plugins>
        <plugin>
            <artifactId>maven-clean-plugin</artifactId>
            <version>3.0.0</version>
        </plugin>
        <plugin>
            <artifactId>maven-resources-plugin</artifactId>
            <version>3.0.2</version>
        </plugin>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.7.0</version>
        </plugin>
        <plugin>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.20.1</version>
        </plugin>
        <plugin>
            <artifactId>maven-install-plugin</artifactId>
            <version>2.5.2</version>
        </plugin>
        <plugin>
            <artifactId>maven-deploy-plugin</artifactId>
            <version>2.8.2</version>
        </plugin>
    </plugins>
</pluginManagement>

JAVA源码插件

<plugin>
    <artifactId>maven-source-plugin</artifactId>
    <version>2.3</version>
    <executions>
        <execution>
            <id>attach-source</id>
            <goals>
                <goal>jar</goal>
            </goals>
        </execution>
    </executions>
</plugin>

JAVA文档插件

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-javadoc-plugin</artifactId>
    <version>2.9.1</version>
    <configuration>
        <charset>UTF-8</charset>
        <encoding>UTF-8</encoding>
        <docencoding>UTF-8</docencoding>
        <includePom>true</includePom>
        <excludeResources>true</excludeResources>
        <attach>true</attach>
    </configuration>
    <executions>
        <execution>
            <id>attach-javadocs</id>
            <goals>
                <goal>jar</goal>
            </goals>
            <configuration>
                <encoding>UTF-8</encoding>
                <additionalparam>${javadoc.opts}</additionalparam>
            </configuration>
        </execution>
    </executions>
</plugin>

jar生成插件

继承POM后需在properties中定义springboot.starter变量，值为spring-boot启动类路径

<!-- 打包jar文件时，配置manifest文件，加入lib包的jar依赖 -->
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <configuration>
        <classesDirectory>target/classes/</classesDirectory>
        <archive>
            <manifest>
                <mainClass>${springboot.starter}</mainClass>
                <!-- 打包时 MANIFEST.MF文件不记录的时间戳版本 -->
                <useUniqueVersions>false</useUniqueVersions>
                <addClasspath>true</addClasspath>
                <classpathPrefix>lib/</classpathPrefix>
            </manifest>
            <manifestEntries>
                <Class-Path>.</Class-Path>
            </manifestEntries>
        </archive>
    </configuration>
</plugin>

项目依赖拷贝插件

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <executions>
        <execution>
            <id>copy-dependencies</id>
            <phase>package</phase>
            <goals>
                <goal>copy-dependencies</goal>
            </goals>
            <configuration>
                <type>jar</type>
                <includeTypes>jar</includeTypes>
                <useUniqueVersions>false</useUniqueVersions>
                <outputDirectory> ${project.build.directory}/lib </outputDirectory>
            </configuration>
        </execution>
    </executions>
</plugin>

Docker镜像化插件

使用方法详见Docker镜像化Dubbo微服务，详细信息可见官方文档

<plugin>
    <groupId>com.spotify</groupId>
    <artifactId>docker-maven-plugin</artifactId>
    <version>1.0.0</version>
    <configuration>
        <imageName>${registry.url}dubbo/${project.artifactId}</imageName>
        <dockerDirectory>src/main/resources/docker</dockerDirectory>
        <imageTags>
            <imageTag>${image.tag}</imageTag>
            <imageTag>latest</imageTag>
        </imageTags>
        <resources>
            <resource>
                <targetPath>/</targetPath>
                <directory>${project.build.directory}</directory>
                <includes>
                    <include>${project.build.finalName}.jar</include>
                    <include>lib/*.jar</include>
                </includes>
            </resource>
        </resources>
    </configuration>
</plugin>

参考资料：

微服务框架（九）Spring Boot 通用Dubbo Parent POM