这次弄一下maven 多模块项目,用vscode新建一下,便于管理项目

首先 创建一个mvn项目, 直接在命令行执行, 原型生成:

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mvn archetype:generate

选一个maven quick start的template, 然后删除src和target文件夹

在pom.xml里面version 下面加上<packing>pom</packing>

在此目录中再次执行mvn archetype:generate, 构件artifactId选为child1, 完成后自动在mvnparent目录的Pom中添加了<modules> 节点

再次在mvnparent目录执行mvn archetype:generate 生成child2项目, 会在mvnparent的pom.xml中添加child2的module, 把里面没用的build 节点都删掉

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<?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>
    <artifactId>mvnparent</artifactId>
    <groupId>org.caloch</groupId>
    <version>1.0-SNAPSHOT</version>
  </parent>

  <artifactId>child2</artifactId>
  <packaging>jar</packaging>

  <name>child2</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>



  
</project>

mvnchild1引用了child2项目的pom.xml, 里面删除groupid和version两个,它们会继承parent, packaging改为jar

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<?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>
    <artifactId>mvnparent</artifactId>
    <groupId>org.caloch</groupId>
    <version>1.0-SNAPSHOT</version>
  </parent>

  <artifactId>mvnchild1</artifactId>
  <packaging>jar</packaging>

  <name>mvnchild1</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>org.caloch</groupId>
      <artifactId>child2</artifactId>
      <version>${project.version}</version>
    </dependency>


  </dependencies>

  
</project>
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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<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>org.caloch</groupId>
  <artifactId>mvnparent</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>pom</packaging>

  <name>mvnparent</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>
  

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

<modules>  <module>mvnchild1</module>
    <module>child2</module>
  </modules>
</project>

将项目导入idea中可以调试, 运行为 java -cp "加上另外项目的class文件路径"

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 D:\source\repos\mvn_multi_module\mvnparent\mvnchild1> java -cp "D:\source\repos\mvn_multi_module\mvnparent\mvnchild1\target\classes;D:\source\repos\mvn_multi_module\mvnparent\child2\target\classes;" child1.App

mvn compile

mvn package

需要指定main class

指定时 java -jar xx.jar可以执行

不指定main class时, 使用java -cp xx.jar {maiclass} 来执行

构建, 在child1的pom里面添加build

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  <build>
    <plugins>

        <!--打包普通项目-->
        <plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <configuration>
                <!-- 可以指定打包的Main类,也可以不指定-->
                <!--指定了某个主类的话,使用: java -jar xxx.jar 参数  来执行-->
                <!--不指定主类的话使用:java -cp  xxx.jar 类的路径 参数  来执行,注意这里需要手动指定执行类-->
                <!--                    <archive>-->
                <!--                        <manifest>-->
                <!--                            &lt;!&ndash;这里要替换成jar包main方法所在类 &ndash;&gt;-->
                <!--                            <mainClass>GetName</mainClass>-->
                <!--                        </manifest>-->
                <!--                        <manifestEntries>-->
                <!--                            &lt;!&ndash;上面指定类的路径&ndash;&gt;-->
                <!--                            <Class-Path>./src/main/java</Class-Path>-->
                <!--                        </manifestEntries>-->
                <!--                    </archive>-->

                <descriptorRefs>
                    <descriptorRef>jar-with-dependencies</descriptorRef>
                </descriptorRefs>
            </configuration>
            <executions>
                <execution>
                    <id>make-assembly</id> <!-- this is used for inheritance merges -->
                    <phase>package</phase> <!-- 指定在打包节点执行jar包合并操作 -->
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

       


    </plugins>
</build>

运行,注意要运行和dependency一起打包的jar才可以不需要额外添加另外一个包的class path, 否则还是要加class path -cp选项:

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cd D:\source\repos\mvn_multi_module\mvnparent\mvnchild1\target

java -cp .\mvnchild1-1.0-SNAPSHOT-jar-with-dependencies.jar child1.App
Hello util in child2

建好的项目文件在:

https://files.cnblogs.com/files/hualiu0/mvnparent.7z?t=1698752418\&download=true