1.项目结构
parent-demo
- service-demo
- web-demo
2.其中web-demo依赖service-demo
3.三个项目之间的pom.xml分别如下
parent-demo
```
<?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>maven 多模块项目构建</description>
<modelVersion>4.0.0</modelVersion>
<name>parent-demo</name>
<packaging>pom</packaging>
<!--项目说明-->
<groupId>com.lanyage.multimodule</groupId>
<artifactId>parent-demo</artifactId>
<version>1.0-SNAPSHOT</version>
<!--继承说明-->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.RELEASE</version>
<relativePath/>
</parent>
<!--声明子模块-->
<modules>
<module>service-demo</module>
<module>web-demo</module>
</modules>
<!--版本说明,在这里声明的依赖在子模块中也需要<dependencies/>引入,但是子模块中就不需要版本了。-->
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.lanyage.multimodule</groupId>
<artifactId>service-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.lanyage.multimodule</groupId>
<artifactId>web-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
</dependencyManagement>
</project>
```
service-demo
```
<?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-->
<modelVersion>4.0.0</modelVersion>
<packaging>jar</packaging>
<name>service-demo</name>
<description>Demo project for Spring Boot</description>
<groupId>com.lanyage.multimodule</groupId>
<artifactId>service-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<!--继承父工程-->
<parent>
<groupId>com.lanyage.multimodule</groupId>
<artifactId>parent-demo</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<!--依赖-->
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
```
web-demo
```
<?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>
<groupId>com.lanyage.multimodule</groupId>
<artifactId>web-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>web-demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>com.lanyage.multimodule</groupId>
<artifactId>parent-demo</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<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>com.lanyage.multimodule</groupId>
<artifactId>service-demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
```
4.打包web-demo时，报错如下。
```
[ERROR] Failed to execute goal on project web-demo: Could not resolve dependencies for project com.lanyage.multimodule:web-demo:jar:0.0.1-SNAPSHOT: Failed to collect dependencies at com.lanyage.multimodule:service-demo:jar:0.0.1-SNAPSHOT: Failed to read artifact descriptor for com.lanyage.multimodule:service-demo:jar:0.0.1-SNAPSHOT: Could not find artifact com.lanyage.multimodule:parent-demo:pom:1.0-SNAPSHOT -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
```
