使用背景：

springboot+maven构建的多模块项目，没有使用springcloud，根项目下有多个module，一个module有springboot启动类，其他module没有启动类，作为module被有springboot启动类的module所引用。

1.根目录下项目maven packaging要声明为pom

 <packaging>pom</packaging>

 2.多个模块管理：

   <modules><module>test-common</module><module>test-system</module><module>test-core</module></modules>

3.build构建声明：

<build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.1</version><configuration><source>${java.version}</source><target>${java.version}</target><encoding>${project.build.sourceEncoding}</encoding></configuration></plugin></plugins></build>

4.有启动类那个module的项目maven packaging要声明为jar

 <artifactId>test-core</artifactId><packaging>jar</packaging>

5.有启动类那个module的pom.xml引入其他子模块

 <dependencies><dependency><groupId>com.daniels</groupId><artifactId>test-system</artifactId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>com.daniels</groupId><artifactId>test-common</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies>

6.有启动类那个module的pom.xml增加build构建插件：

<build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>3.1.3</version><executions><execution><goals><goal>repackage</goal></goals></execution></executions></plugin><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-war-plugin</artifactId><version>3.1.0</version><configuration><failOnMissingWebXml>false</failOnMissingWebXml><warName>${project.artifactId}</warName></configuration></plugin></plugins><finalName>${project.artifactId}</finalName></build>

其他没有启动类的module的pom.xml只用引入需要的jar即可，示例：

<?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><parent><groupId>com.daniels</groupId><artifactId>test</artifactId><version>1.0-SNAPSHOT</version></parent><artifactId>test-system</artifactId><description>系统模块</description><dependencies><dependency><groupId>com.daniels</groupId><artifactId>test-common</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies></project>

如此便可将有启动类的module打包成Jar，同时将其他引用到子module打包进该jar中。