创建项目结构：
    父级
    image.png
    在父级创建Mould:
    image.png
    image.png
    image.png
    在该Module下又下两个Module:
    image.png
    image.png

    项目创建完毕：
    image.png
    admin: 后台
    common: 公共的类，配置，工具类
    iaas: 网关和制授权
    res: 资源
    sys: 系统管理，用户
    data-analysis: 系统统计
    third：上报管理(第三方)
    oa: 在线OA

    把所有服务的service的pom.xml都引用自己服务的common模块：
    1.先在父类把所有的包都打包：
    image.png

    把所有的版本号都定义在父类的pom.xml:
    image.png

    1. <properties>
    2.     <java.version>1.8</java.version>
    3.     <spring-cloud.version>Hoxton.SR3</spring-cloud.version>
    4.     <com-alibaba-cloud.version>2.2.0.RELEASE</com-alibaba-cloud.version>
    5.     <mybatis-plus-boot-stater.version>3.3.2</mybatis-plus-boot-stater.version>
    6.     <druid-boot-stater.version>1.1.23</druid-boot-stater.version>
    7.     <redisson-spring-boot-starter.version>3.13.3</redisson-spring-boot-starter.version>
    8.     <jetcache-starter-redis.version>2.6.0</jetcache-starter-redis.version>
    9.     <disruptor.version>3.4.2</disruptor.version>
    10.     <org.mapstruct.version>1.4.0.Beta3</org.mapstruct.version>
    11.     <commons-beanutils.version>1.9.4</commons-beanutils.version>
    12.     <swagger-annotations.version>1.5.20</swagger-annotations.version>
    13.     <googleauth.version>1.1.5</googleauth.version>
    14.     <net.sf.supercsv.version>2.4.0</net.sf.supercsv.version>
    15.     <springside-utils.version>5.0.0-RC1</springside-utils.version>
    16.     <aliyun-sdk-oss.version>3.1.0</aliyun-sdk-oss.version>
    17.     <aliyun-java-sdk-core.version>4.0.3</aliyun-java-sdk-core.version>
    18.     <aliyun-java-sdk-dm.version>3.3.1</aliyun-java-sdk-dm.version>
    19.     <joda-time.version>2.10</joda-time.version>
    20.     <okhttp.version>3.11.0</okhttp.version>
    21.     <okio.version>1.15.0</okio.version>
    22. </properties>
    1. <dependencies>
    2.         <dependency>
    3.             <groupId>org.projectlombok</groupId>
    4.             <artifactId>lombok</artifactId>
    5.         </dependency>
    6.         <!-- https://mvnrepository.com/artifact/io.swagger/swagger-annotations -->
    7.         <dependency>
    8.             <groupId>io.swagger</groupId>
    9.             <artifactId>swagger-annotations</artifactId>
    10.         </dependency>
    11.         <dependency>
    12.             <groupId>com.baomidou</groupId>
    13.             <artifactId>mybatis-plus-annotation</artifactId>
    14.         </dependency>
    15.         <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations -->
    16.         <dependency>
    17.             <groupId>com.fasterxml.jackson.core</groupId>
    18.             <artifactId>jackson-annotations</artifactId>
    19.         </dependency>
    21.     </dependencies>
    23.     <dependencyManagement>
    24.         <dependencies>
    25.             <dependency>
    26.                 <groupId>org.springframework.cloud</groupId>
    27.                 <artifactId>spring-cloud-dependencies</artifactId>
    28.                 <version>${spring-cloud.version}</version>
    29.                 <type>pom</type>
    30.                 <scope>import</scope>
    31.             </dependency>
    32.             <dependency>
    33.                 <groupId>com.alibaba.cloud</groupId>
    34.                 <artifactId>spring-cloud-alibaba-dependencies</artifactId>
    35.                 <version>${com-alibaba-cloud.version}</version>
    36.                 <type>pom</type>
    37.                 <scope>import</scope>
    38.             </dependency>
    39.             <dependency>
    40.                 <groupId>io.swagger</groupId>
    41.                 <artifactId>swagger-annotations</artifactId>
    42.                 <version>${swagger-annotations.version}</version>
    43.             </dependency>
    44.             <dependency>
    45.                 <groupId>com.baomidou</groupId>
    46.                 <artifactId>mybatis-plus-boot-starter</artifactId>
    47.                 <version>${mybatis-plus-boot-stater.version}</version>
    48.             </dependency>
    49.             <dependency>
    50.                 <groupId>com.baomidou</groupId>
    51.                 <artifactId>mybatis-plus-annotation</artifactId>
    52.                 <version>${mybatis-plus-boot-stater.version}</version>
    53.             </dependency>
    54.             <!-- https://mvnrepository.com/artifact/com.alibaba/druid-spring-boot-starter -->
    55.             <dependency>
    56.                 <groupId>com.alibaba</groupId>
    57.                 <artifactId>druid-spring-boot-starter</artifactId>
    58.                 <version>${druid-boot-stater.version}</version>
    59.             </dependency>
    61.             <dependency>
    62.                 <groupId>commons-beanutils</groupId>
    63.                 <artifactId>commons-beanutils</artifactId>
    64.                 <version>${commons-beanutils.version}</version>
    65.             </dependency>
    66.             <!-- https://mvnrepository.com/artifact/org.redisson/redisson-spring-boot-starter -->
    67.             <dependency>
    68.                 <groupId>org.redisson</groupId>
    69.                 <artifactId>redisson-spring-boot-starter</artifactId>
    70.                 <version>${redisson-spring-boot-starter.version}</version>
    71.             </dependency>
    73.             <!-- https://mvnrepository.com/artifact/com.alicp.jetcache/jetcache-starter-redis -->
    74.             <dependency>
    75.                 <groupId>com.alicp.jetcache</groupId>
    76.                 <artifactId>jetcache-starter-redis</artifactId>
    77.                 <version>${jetcache-starter-redis.version}</version>
    78.             </dependency>
    79.             <!-- https://mvnrepository.com/artifact/com.lmax/disruptor -->
    80.             <dependency>
    81.                 <groupId>com.lmax</groupId>
    82.                 <artifactId>disruptor</artifactId>
    83.                 <version>${disruptor.version}</version>
    84.             </dependency>
    85.             <dependency>
    86.                 <groupId>io.springfox</groupId>
    87.                 <artifactId>springfox-swagger2</artifactId>
    88.                 <version>${swagger2.version}</version>
    89.             </dependency>
    90.             <dependency>
    91.                 <groupId>io.springfox</groupId>
    92.                 <artifactId>springfox-swagger-ui</artifactId>
    93.                 <version>${swagger2.version}</version>
    94.             </dependency>
    96.             <!--mapStruct依赖-->
    97.             <dependency>
    98.                 <groupId>org.mapstruct</groupId>
    99.                 <artifactId>mapstruct-jdk8</artifactId>
    100.                 <version>${org.mapstruct.version}</version>
    101.             </dependency>
    102.             <dependency>
    103.                 <groupId>org.mapstruct</groupId>
    104.                 <artifactId>mapstruct-processor</artifactId>
    105.                 <version>${org.mapstruct.version}</version>
    106.                 <scope>provided</scope>
    107.             </dependency>
    109.             <dependency>
    110.                 <groupId>net.sf.supercsv</groupId>
    111.                 <artifactId>super-csv</artifactId>
    112.                 <version>${net.sf.supercsv.version}</version>
    113.             </dependency>
    115.             <dependency>
    116.                 <groupId>io.springside</groupId>
    117.                 <artifactId>springside-utils</artifactId>
    118.                 <version>${springside-utils.version}</version>
    119.             </dependency>
    121.             <dependency>
    122.                 <groupId>org.flywaydb</groupId>
    123.                 <artifactId>flyway-core</artifactId>
    124.                 <version>${flyway.version}</version>
    125.             </dependency>
    126.             <dependency>
    127.                 <groupId>joda-time</groupId>
    128.                 <artifactId>joda-time</artifactId>
    129.                 <version>${joda-time.version}</version>
    130.             </dependency>
    131.             <dependency>
    132.                 <groupId>com.squareup.okhttp3</groupId>
    133.                 <artifactId>okhttp</artifactId>
    134.                 <version>${okhttp.version}</version>
    135.             </dependency>
    136.             <dependency>
    137.                 <groupId>com.squareup.okio</groupId>
    138.                 <artifactId>okio</artifactId>
    139.                 <version>${okio.version}</version>
    140.             </dependency>
    141.             <dependency>
    142.                 <groupId>com.aliyun.oss</groupId>
    143.                 <artifactId>aliyun-sdk-oss</artifactId>
    144.                 <version>${aliyun-sdk-oss.version}</version>
    145.             </dependency>
    146.             <dependency>
    147.                 <groupId>com.aliyun</groupId>
    148.                 <artifactId>aliyun-java-sdk-core</artifactId>
    149.                 <version>${aliyun-java-sdk-core.version}</version>
    150.             </dependency>
    151.             <dependency>
    152.                 <groupId>com.aliyun</groupId>
    153.                 <artifactId>aliyun-java-sdk-dm</artifactId>
    154.                 <version>${aliyun-java-sdk-dm.version}</version>
    155.             </dependency>
    156.         </dependencies>
    157.     </dependencyManagement>

    1、在Maven中dependencyManagement的作用其实相当于一个对所依赖jar包进行版本管理的管理器。
    2、pom.xml文件中，jar的版本判断的两种途径
    1）如果dependencies里的dependency自己没有声明version元素，那么maven就会到dependencyManagement里面去找有没有对该artifactId和groupId进行过版本声明，如果有，就继承它，如果没有就会报错，告诉你必须为dependency声明一个version。
    2）如果dependencies中的dependency声明了version，那么无论dependencyManagement中有无对该jar的version声明，都以dependency里的version为准。
    3、1）dependencies即使在子项目中不写该依赖项，那么子项目仍然会从父项目中继承该依赖项（全部继承）
    2）dependencyManagement里只是声明依赖，并不实现引入，因此子项目需要显示的声明需要用的依赖。如果不在子项目中声明依赖，是不会从父项目中继承下来的；只有在子项目中写了该依赖项，并且没有指定具体版本，才会从父项目中继承该项，并且version和scope都读取自父pom;另外如果子项目中指定了版本号，那么会使用子项目中指定的jar版本。