Maven讲解之聚合

阳光穿透心脏的1/2处 2022-06-07 07:29 243阅读 0赞

## **Maven讲解之 聚合** ##

## **概念** ##

将多个工程拆分为模块后，需要手动逐个安装到仓库后依赖才能够生效。修改源码后也需要逐个手动进  
行 clean 操作。而使用了聚合之后就可以批量进行 Maven 工程的安装、清理工作。

--------------------

*  实例讲解
    
     *  父工程
        
         *  新建父工程，以pom为打包方式的Maven工程
            
            ![这里写图片描述][SouthEast]
            
             *  pom.xml
            
                <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.sstps.oscar</groupId>
                    <artifactId>Adoie</artifactId>
                    <version>0.0.1-SNAPSHOT</version>
                    <packaging>pom</packaging>
                
                    
                    <modules>
                        <module>../Brokers</module>
                        <module>../Market</module>
                        <module>../Customer</module>
                
                    </modules>
                
                    
                    <dependencyManagement>
                        <dependencies>
                            
                            <dependency>
                                <groupId>junit</groupId>
                                <artifactId>junit</artifactId>
                                <version>4.0</version>
                                <scope>test</scope>
                            </dependency>
                
                        </dependencies>
                    </dependencyManagement>
                </project>
     *  新建Maven子项目
        
         *  Brokers
            
             *  项目结构  
                ![这里写图片描述][SouthEast 1]
             *  pom.xml
                
                    <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>
                        <artifactId>Brokers</artifactId>
                        <packaging>war</packaging>
                    
                        
                        <parent>
                            <groupId>com.sstps.oscar</groupId>
                            <artifactId>Adoie</artifactId>
                            <version>0.0.1-SNAPSHOT</version>
                    
                            
                            <relativePath>../Adoie/pom.xml</relativePath>
                        </parent>
                    
                        <dependencies>
                            <dependency>
                                <groupId>junit</groupId>
                                <artifactId>junit</artifactId>
                                <scope>test</scope>
                            </dependency>
                        </dependencies>
                    </project>
         *  Market
            
             *  项目结构  
                ![这里写图片描述][SouthEast 2]
             *  pom.xml
                
                    <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.sspts.oscar</groupId>
                      <artifactId>Market</artifactId>
                      <packaging>war</packaging>
                    
                      
                        <parent>
                            <groupId>com.sstps.oscar</groupId>
                            <artifactId>Adoie</artifactId>
                            <version>0.0.1-SNAPSHOT</version>
                    
                            
                            <relativePath>../Adoie/pom.xml</relativePath>
                        </parent>
                    
                        <dependencies>
                            <dependency>
                                <groupId>junit</groupId>
                                <artifactId>junit</artifactId>
                                <scope>test</scope>
                            </dependency>
                        </dependencies>
                    </project>
         *  Customer
            
             *  项目结构
                
                ![这里写图片描述][SouthEast 3]
         *  pom.xml
            
                <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.sspts.oscar</groupId>
                    <artifactId>Customer</artifactId>
                    <packaging>war</packaging>
                
                    
                    <parent>
                        <groupId>com.sstps.oscar</groupId>
                        <artifactId>Adoie</artifactId>
                        <version>0.0.1-SNAPSHOT</version>
                
                        
                        <relativePath>../Adoie/pom.xml</relativePath>
                    </parent>
                
                    <properties>
                        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
                        <spring.version>4.0.4.RELEASE</spring.version>
                    </properties>
                
                    <dependencies>
                        
                        <dependency>
                            <groupId>org.springframework</groupId>
                            <artifactId>spring-aop</artifactId>
                            <version>${spring.version}</version>
                
                            <exclusions>
                                <exclusion>
                                    <groupId>commons-logging</groupId>
                                    <artifactId>commons-logging</artifactId>
                                </exclusion>
                            </exclusions>
                        </dependency>
                        <dependency>
                            <groupId>org.springframework</groupId>
                            <artifactId>spring-aspects</artifactId>
                            <version>${spring.version}</version>
                        </dependency>
                        <dependency>
                            <groupId>org.springframework</groupId>
                            <artifactId>spring-beans</artifactId>
                            <version>${spring.version}</version>
                        </dependency>
                        <dependency>
                            <groupId>org.springframework</groupId>
                            <artifactId>spring-context</artifactId>
                            <version>${spring.version}</version>
                        </dependency>
                        
                        
                
                        
                        <dependency>
                            <groupId>javax.servlet</groupId>
                            <artifactId>javax.servlet-api</artifactId>
                            <version>3.1.0</version>
                            <scope>provided</scope>
                        </dependency>
                
                        <dependency>
                            <groupId>junit</groupId>
                            <artifactId>junit</artifactId>
                            <scope>test</scope>
                        </dependency>
                    </dependencies>
                </project>

--------------------

## **聚合操作** ##

*  clean
    
    ![这里写图片描述][SouthEast 4]
 *  install
    
    ![这里写图片描述][SouthEast 5]

--------------------

## **注意** ##

*  **聚合时子工程必须引用父工程GAV即pom.xml。**
 *  **子工程之间应避免相互存在依赖的情况。**
 *  **在聚合操作过程中，子工程被执行的顺序与其在父工程中的Models配置顺序有关，从上至下逐个执行。**
 *  **当某个子工程执行失败之后，该子工程之后的所有子工程都将跳过不执行。**

[SouthEast]: /images/20220607/d94c928652eb4fbbb395d0e66f2068bd.png
[SouthEast 1]: /images/20220607/d0db437fd10e422a99d2972690ffdeee.png
[SouthEast 2]: /images/20220607/23c13104fdb34291b5bb6d773eac8fc8.png
[SouthEast 3]: /images/20220607/b4af3969c62e48eaa1d660191a66fde3.png
[SouthEast 4]: /images/20220607/a857168b39ec49b39b5834bc7e84cd92.png
[SouthEast 5]: /images/20220607/24e68fc0fdd84422a25d3d0aeb927dd2.png