Maven項目繼承父項目依賴

Maven子項目繼承父項目的依賴比較常用。比如Spring Boot項目

<parent>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-parent</artifactId>
     <version>2.1.3.RELEASE</version>
     <relativePath/> <!-- lookup parent from repository -->
</parent>

這樣創建的Maven項目就帶有了這個Spring Boot項目的依賴，以及以後的版本號都可以繼承。

---

本地父子項目繼承

其實都是一個座標，不過本地父項目你需要install到本地Maven倉庫，不然座標無法檢索。比如常見的服務發現Spring Cloud Eureka

• 父項目

<?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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>xyz.cglzwz</groupId>
    <artifactId>ms-springcloud</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>ms-springcloud</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <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>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

父項目繼承Spring Boot，因爲這個Spring Boot在網絡中心倉庫，這可以檢索。然後

mvn clean install

安裝到本地倉庫即可讓子項目繼承

• 子項目

<?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>xyz.cglzwz</groupId>
        <artifactId>ms-springcloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>

    <groupId>xyz.cglzwz</groupId>
    <artifactId>ms-user</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>ms-user</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

父項目有的依賴子項目都會有了