1. Steps of building parent project based on IDEA
- New maven project
2. Name of aggregation parent project
- Maven selected version
- Character encoding settings
- Annotation effective activation
- Java version selection 8
- File Type filtering
2.pom file description
1.pom Document content
<?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.smcaiot.springcloud</groupId> <artifactId>cloud2020</artifactId> <version>1.0-SNAPSHOT</version> <packaging>pom</packaging> <!--unified management jar Package version--> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> <junit.version>4.12</junit.version> <log4j.version>1.2.17</log4j.version> <lombok.version>1.16.18</lombok.version> <mysql.version>5.1.47</mysql.version> <druid.vsesion>1.1.16</druid.vsesion> <mybatis.spring.boot.version>1.3.0</mybatis.spring.boot.version> </properties> <!--After the sub module inherits, it provides the function of locking version+son modlu and version--> <dependencyManagement> <dependencies> <!--springboot 2.2.2--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-dependencies</artifactId> <version>2.2.2.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> <!--spring cloud Hoxton.SR1--> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>Hoxton.SR1</version> <type>pom</type> <scope>import</scope> </dependency> <!--spring cloud alibaba--> <dependency> <groupId>com.alibaba.cloud</groupId> <artifactId>spring-cloud-alibaba-dependencies</artifactId> <version>2.1.0.RELEASE</version> <type>pom</type> <scope>import</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>${druid.vsesion}</version> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>${mybatis.spring.boot.version}</version> </dependency> </dependencies> </dependencyManagement> </project>
3. The function of < dependency Management > tag
- Lock the version. When the dependency under this label is used in the sub module, you do not need to specify the version. The sub module will go to the parent module to find the version and download the dependency.
- This tag is only used as a declaration, but the introduction of actual dependency still requires the introduction of each sub block display, just without the declaration of version number. The advantage of this is that it is convenient for the unified maintenance of dependent version number.
