The handwriting Maven archetype project scaffolding

Others 2019-08-18 13:48:41 views: null

One, background

　　maven is a very good code build tools using the principle of "convention-over-configuration" of project management, we believe that many of java developers should understand maven and may be in the work which is managed by maven project, created in project, we tend to use maven built project is the archetype framework to quickly build the project structure. But in the process of developing a team to do, it may rely solely on archetyp maven provided in advance may not be enough, have their own definition of collaboration between the way a team, everyone's not the same style structure is defined, in this context we it is necessary to define a unified code skeleton for team use, the benefits of doing so is that when the team need to start a new project, you can use a custom maven skeleton key to build the project.

　　archetype is configured at the time maven-archetype-plugin plugin performs generate goals, we often use to include embedded skeleton maven: maven-archetype-webapp, maven-archetype-quickstart. The former is used to quickly build a web project, which is used to quickly build a common java projects.

Second, the handwriting ordinary single-module project archetype

Project scaffolding structure archetype of single-module project

　　

Detailed image above each file:

  • and general maven pom.xml project under the root directory of the beast-archetype defined as major information projects such as coordinate archetype.
  • All projects are concentrated in the skeleton content under src / main / resources / archetype-resources folder.
  • archetype-resources in pom.xml pom defines the contents of the project file to be generated, / src / main / java, / src / test / java define the contents in the corresponding directory to be generated in the project
  • /src/main/resources/META-INF/maven/archetype-metadata.xml defined metadata associated description (which is fixed at the location of the file resources / META-INF / maven file folder, and the name is fixed archetype- metadata.xml).

1.beast-archetype / pom.xml follows

<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.thebeastshop</groupId>
    <artifactId>beast-archetype</artifactId>
    <version>1.1</version>
    <packaging>jar</packaging>

    <name>beast-archetype</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <finalName>beast-archetype</finalName>
    </build>
</project>

2.src / main / resources / archetype-resources / pom.xml follows:

<?xml version="1.0"?>
<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>${groupId}</groupId>
    <artifactId>${artifactId}</artifactId>
    <version>${version}</version>
    <name>${artifactId}</name>
    
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
             <plugin> 
                 <artifactId>maven-deploy-plugin</artifactId> 
                 <configuration> 
                    <skip>true</skip> 
                 </configuration> 
             </plugin>
        </plugins>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-archetype-plugin</artifactId>
                    <version>2.2</version>
                    <configuration>
                        <source>1.7</source>
                        <target>1.7</target>
                    </configuration>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-source-plugin</artifactId>
                    <configuration>
                        <encoding>UTF-8</encoding>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

Wherein: above $ {variable} are identified by the maven passed in the command line, such as: mvn archetype: generate -DgroupId = com.thebeastshop

3.src / main / resources / META-INF / maven / archetype-metadata.xml follows:

<?xml version="1.0" encoding="UTF-8"?>
<archetype-descriptor  name="beast-archetype"
        xmlns="http://maven.apache.org/plugins/maven-archetype-plugin/archetype-descriptor/1.0.0"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="
            http://maven.apache.org/plugins/maven-archetype-plugin/archetype-descriptor/1.0.0
            http://maven.apache.org/xsd/archetype-descriptor-1.0.0.xsd">

    <requiredProperties>
        <requiredProperty key="package-name" />
    </requiredProperties>

    <fileSets>
        <fileSet filtered="true" packaged="true" encoding="UTF-8">
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.java</include>
            </includes>
        </fileSet>
        <fileSet filtered="true" encoding="UTF-8">
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.*</include>
            </includes>
        </fileSet>
        <fileSet filtered="true" packaged="true" encoding="UTF-8">
            <directory>src/test/java</directory>
            <includes>
                <include>**/*.java</include>
            </includes>
        </fileSet>
        <fileSet encoding="UTF-8">
            <directory>src/test/resources</directory>
            <includes>
                <include>**/*.*</include>
            </includes>
        </fileSet>
    </fileSets>
</archetype-descriptor>

Description:

  • packaged = "true" identification src / main / resources / archetype-resources / src / main / java corresponding to the content is to be placed in the package, such as package com.thebeastshop, then if the property is true, the corresponding java file into com / thebeastshop folder, which is under the package path.
  • filtered = "true" $ {identifier} mentioned below whether or not to replace

4.src / main / resources / archetype-resources / src / main / java / Demo.java follows:

package ${package};

public class Demo{
    public static void main( String[] args )
    {
        System.out.println( "Hello My Archetype!" );
    }
}

5. So we handwriting good maven archetype skeleton of a custom project, we only need mvn clean install command to install the jar package to a local warehouse, and then to build a project by the local warehouse jar package to see effect, using the following command:

 mvn archetype:generate 
　　-DgroupId=comthebeastshop 
　　-DartifactId=beast-test 
　　-Dpackage="com.thebeastshop.test" 
　　-DarchetypeGroupId=com.thebeastshop 
　　-DarchetypeArtifactId=beast-archetype -DarchetypeVersion=1.1 -X -DarchetypeCatalog=local

Third, handwriting maven multi module project skeleton archetype

1. The multi-module configuration item's backbone

This is not very different with the single module projects, but there are several concepts to explain:

  • "__RootArtifactId__" placeholder will be replaced artifactId parent project
  • $ {RootArtifactId} will be replaced artifactId parent project
  • src/main/resources/archetype-resources里必须要有一个顶级pom文件（如果是单工程就是工程pom文件），同时子文件夹代表了模块定义

2.模板工程定义描述文件：META-INF/maven/archetype-metadata.xml

<?xml version="1.0" encoding="UTF-8"?>
<archetype-descriptor  name="beast-archetype"
        xmlns="http://maven.apache.org/plugins/maven-archetype-plugin/archetype-descriptor/1.0.0"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="
            http://maven.apache.org/plugins/maven-archetype-plugin/archetype-descriptor/1.0.0
            http://maven.apache.org/xsd/archetype-descriptor-1.0.0.xsd">

    <requiredProperties>
        <requiredProperty key="groupId">
            <defaultValue>com.thebeastshop</defaultValue>
        </requiredProperty>
        <requiredProperty key="artifactId">
            <defaultValue>test</defaultValue>
        </requiredProperty>
        <requiredProperty key="package">
            <defaultValue>com.thebeastshop.test</defaultValue>
        </requiredProperty>
    </requiredProperties>

    <modules>
        <module id="${rootArtifactId}-api" name="${rootArtifactId}-api" dir="__rootArtifactId__-api">
            <fileSets>
                <fileSet filtered="true" encoding="UTF-8" packaged="true">
                    <directory>src/main/java</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet filtered="true" encoding="UTF-8" packaged="true">
                    <directory>src/test/java</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet encoding="UTF-8">
                    <directory>src/main/resources</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet encoding="UTF-8">
                    <directory>src/test/resources</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
            </fileSets>
        </module>
        <module id="${rootArtifactId}-core" name="${rootArtifactId}-core" dir="__rootArtifactId__-core">
            <fileSets>
                <fileSet filtered="true" encoding="UTF-8" packaged="true">
                    <directory>src/main/java</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet filtered="true" encoding="UTF-8" packaged="true">
                    <directory>src/test/java</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet filtered="true" encoding="UTF-8">
                    <directory>src/main/resources</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet encoding="UTF-8">
                    <directory>src/test/resources</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
            </fileSets>
        </module>
        <module id="${rootArtifactId}-dao" name="${rootArtifactId}-dao" dir="__rootArtifactId__-dao">
            <fileSets>
                <fileSet filtered="true" encoding="UTF-8" packaged="true">
                    <directory>src/main/java</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet filtered="true" encoding="UTF-8" packaged="true">
                    <directory>src/test/java</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet filtered="true" encoding="UTF-8">
                    <directory>src/main/resources</directory>
                    <includes>
                        <include>**/*.*</include>
                        <include>mapper</include>
                    </includes>
                </fileSet>
                <fileSet encoding="UTF-8">
                    <directory>src/test/resources</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
            </fileSets>
        </module>
        <module id="${rootArtifactId}-main" name="${rootArtifactId}-main" dir="__rootArtifactId__-main">
            <fileSets>
                <fileSet filtered="true" encoding="UTF-8" packaged="true">
                    <directory>src/main/java</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet filtered="true" encoding="UTF-8" packaged="true">
                    <directory>src/test/java</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet filtered="true" encoding="UTF-8">
                    <directory>src/main/resources</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet encoding="UTF-8">
                    <directory>src/test/resources</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet encoding="UTF-8">
                    <directory>src/main/assembly</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet encoding="UTF-8">
                    <directory>src/main/bin</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
            </fileSets>
        </module>
        <module id="${rootArtifactId}-mybatisGen" name="${rootArtifactId}-mybatisGen" dir="__rootArtifactId__-mybatisGen">
            <fileSets>
                <fileSet filtered="true" encoding="UTF-8" packaged="true">
                    <directory>src/main/java</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet filtered="true" encoding="UTF-8" packaged="true">
                    <directory>src/test/java</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet encoding="UTF-8">
                    <directory>src/main/resources</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
                <fileSet encoding="UTF-8">
                    <directory>src/test/resources</directory>
                    <includes>
                        <include>**/*.*</include>
                    </includes>
                </fileSet>
            </fileSets>
        </module>
    </modules>
</archetype-descriptor>
  • 属性变量定义
  • <requiredProperties>
    <requiredProperty key="groupId">
        <defaultValue>com.thebeastshop</defaultValue>
    </requiredProperty>
    <requiredProperty key="artifactId">
        <defaultValue>test</defaultValue>
    </requiredProperty>
    <requiredProperty key="package">
        <defaultValue>com.thebeastshop.test</defaultValue>
    </requiredProperty>
</requiredProperties>

    这些属性可以在资源元文件里的任意一个文件里通过${var}来引用，所以的元文件最终都可以选择通过velocity引擎来执行替换后生成。
    默认的属性有：groupId，artifactId，packeage，version等

  • 项目子模块定义 
    <modules>
    <module id="${rootArtifactId}-api" name="${rootArtifactId}-api" dir="__rootArtifactId__-api">
        ...
    </module>
    <module id="${rootArtifactId}-core" name="${rootArtifactId}-core" dir="__rootArtifactId__-core">
        ...
    </module>
    <module id="${rootArtifactId}-dao" name="${rootArtifactId}-dao" dir="__rootArtifactId__-dao">
        ...
    </module>
    <module id="${rootArtifactId}-main" name="${rootArtifactId}-main" dir="__rootArtifactId__-main">
        ...
    </module>
    <module id="${rootArtifactId}-mybatisGen" name="${rootArtifactId}-mybatisGen" dir="__rootArtifactId__-mybatisGen">
        ...
    </module>
</modules>

    module有三个属性，解释如下：
    id     ：定义子模块工程的artifactId.
    dir    ：子模块工程源文件在archetype-resources里对应的directory.
    name   ：子模块的名字.

3.子模块pom.xml定义如下(以core模块为例)：

<?xml version="1.0"?>
<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.thebeastshop</groupId>
        <artifactId>${rootArtifactId}</artifactId>
        <version>${version}</version>
    </parent>

    <artifactId>${artifactId}</artifactId>
    <name>${artifactId}</name>
    
    <dependencies>
        <dependency>
            <groupId>com.thebeastshop</groupId>
            <artifactId>${rootArtifactId}-api</artifactId>
            <version>${api.version}</version>
        </dependency>
        <dependency>
            <groupId>com.thebeastshop</groupId>
            <artifactId>${rootArtifactId}-dao</artifactId>
            <version>${project.parent.version}</version>
        </dependency>
    </dependencies>
    
    <build>
        <plugins>
             <plugin> 
                 <artifactId>maven-deploy-plugin</artifactId> 
                 <configuration> 
                    <skip>true</skip> 
                 </configuration> 
             </plugin>
        </plugins>
    </build>
</project>

其中${rootArtifactId}就代表父项目的artifactId.

4.我们和单模块脚手架工程一样，通过mvn clean install命令把该脚手架项目安装到本地maven仓库，然后就可以使用该项目来快速生成新项目结构了，生成命令如下：

mvn archetype:generate 
　　-DgroupId=com.thebeastshop 
　　-DartifactId=ddd 
　　-Dversion=1.0.0-SNAPSHOT
　　-DarchetypeGroupId=com.thebeastshop 
　　-DarchetypeArtifactId=beast-archetype 
　　-DarchetypeVersion=1.3-SNAPSHOT -X -DarchetypeCatalog=local

我们就会看到生成好的项目结构如下：

多模块项目脚手架源码：https://github.com/hafizzhang/beast-archetype

四、总结

　　在工作中，我们通常要有“偷懒”意识，通过摸索来开发出类似项目脚手架一样的工具来提升自己工作的效率。不能整天都是浑浑噩噩的过去，而且表面上看上去很难的东西实际上并不见得一定就如想象中的难。程序猿还是要有所追求，哈哈~

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Origin www.cnblogs.com/sidesky/p/11371878.html
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