【前言】
项目虽然是Eureka、OpenFeign 进行服务注册和服务调用，但是每个模块都是一个单独的SpringBoot，启动每个模块都需要单独启动一个idea,觉得这个过于繁琐，现在想把项目变成一个聚合项目，只需要启动一个idea即可。
【过程】
1、新建maven聚合父工程
快速创建一个maven工程，删除无关文件，只保留pom.xml
pom文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<!-- 基本信息 -->
<description>SpringBoot 多模块构建示例</description>
<modelVersion>4.0.0</modelVersion>
<name>project-aggregation</name>
<packaging>pom</packaging>
<!-- 项目说明：这里作为聚合工程的父工程 -->
<groupId>com.pu</groupId>
<artifactId>project-aggregation</artifactId>
<version>1.0-SNAPSHOT</version>
<!-- 继承说明：这里继承SpringBoot提供的父工程 -->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.5.RELEASE</version>
<relativePath/>
</parent>
<!-- 模块说明：这里声明多个子模块 -->
<modules>
<module>helloworld</module>
<module>mybatistest</module>
</modules>
<!-- 在properties中统一控制依赖包的版本，更清晰-->
<properties>
<java.version>1.8</java.version>
<fastjson.version>1.2.32</fastjson.version>
<spring-cloud.version>Greenwich.SR1</spring-cloud.version>
<feign.version>2.1.1.RELEASE</feign.version>
<eureka-client.version>2.1.1.RELEASE</eureka-client.version>
<zkclient.version>0.10</zkclient.version>
<poi.version>3.13</poi.version>
<lombok.version>1.18.6</lombok.version>
</properties>
<!--在此处统一加，子项目pom就可以不用引入了-->
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<!-- lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
</dependency>
</dependencies>
<!--dependencyManagement用于管理依赖版本号-->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>${eureka-client.version}</version>
</dependency>
<!--feign -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
<version>${feign.version}</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>${fastjson.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>${poi.version}</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>${poi.version}</version>
</dependency>
<!-- lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
<!--该插件作用是打一个可运行的包，必须要写在需要打包的项目里。这里的父模块不需要打包运行，所以删掉该插件。-->
<!--<build>-->
<!--<plugins>-->
<!--<plugin>-->
<!--<groupId>org.springframework.boot</groupId>-->
<!--<artifactId>spring-boot-maven-plugin</artifactId>-->
<!--</plugin>-->
<!--</plugins>-->
<!--</build>-->
</project>
2.建子模块module项目helloworld
父工程右键–》new–>module
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<!-- 基本信息 -->
<groupId>com.pu</groupId>
<artifactId>helloworld</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>helloworld</name>
<description>Demo project for Spring Boot</description>
<!-- 继承本项目的父工程 -->
<parent>
<groupId>com.pu</groupId>
<artifactId>project-aggregation</artifactId>
<version>1.0-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath><!-- lookup parent from repository -->
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
【细节】
（1）在进行子模块创建的时候，下面的relativePath需要执行父POM的地址才能依赖上
<parent>
<groupId>com.example</groupId>
<artifactId>intellnm</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath></relativePath>
</parent>
正确的应该是
<parent>
<groupId>com.example</groupId>
<artifactId>intellnm</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../pom.xml</relativePath>
</parent>
这样就可以避免出现下面这个问题了。
Could not find artifact com.example:intellnm:pom:0.0.1-SWAPSHOT and ‘parent.relativePath’ points at no local POM line 11, column 10 -> [Help 2]
