**

第一

**

**1.点击 file -->new–>project

**

springcloud maven springcloud maven模块之间互相引用_xml


2.选择maven 新建父级项目,名字为parent

**

切记父级项目的作用是 可以统一的约束所有项目的依赖版本,同一管理项目依赖版本

**

springcloud maven springcloud maven模块之间互相引用_maven_02


3.在该父级项目的pom.xml文件中,如下图所示

<?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>

    <!--继承的父级项目-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <!--继承父级项目的依赖,不需要写版本号-->
    <dependencies>
        <!--SpringBoot aop-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
    </dependencies>

    <groupId>com.baigu</groupId>
    <artifactId>parent</artifactId>
    <version>1.0-SNAPSHOT</version>

</project>

**

第二

**

1.接下来创建子级项目,继承父级项目依赖

父级项目名上–》右键–》new–》Module

springcloud maven springcloud maven模块之间互相引用_springcloud maven_03


2.起名字叫做manager

pom.xml文件为

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <!--继承自己的父级项目-->
    <parent>
        <groupId>com.baigu</groupId>
        <artifactId>parent</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <groupId>com.baigu</groupId>
    <artifactId>manager</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>manager</name>
    <description>Demo project for Spring Boot</description>

</project>

此时父级parent项目的pom.xml文件为

<?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>

    <!--继承的父级项目-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <!--继承父级项目的依赖,不需要写版本号-->
    <dependencies>
        <!--SpringBoot aop-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
    </dependencies>

    <!--任何子级项目集成了该父级项目 需要在父级项目的pom.xml文件中做配置-->
    <modules>
        <module>manager</module>
    </modules>

    <groupId>com.baigu</groupId>
    <artifactId>parent</artifactId>
    <version>1.0-SNAPSHOT</version>

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

**

另一种依赖的继承关系

项目选择性继承依赖

**
**父级项目的pom.xml文件

<?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>

    <!--继承的父级项目-->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <!--继承父级项目的依赖,不需要写版本号-->
    <dependencies>
        <!--SpringBoot aop-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
    </dependencies>

    <!--依赖管理 写在dependencyManagement里的依赖 是一种声明  并不会被直接继承到
    子级项目如果想要继承  需要声明(配置依赖) 但是不需要写版本号 会依赖父级项目中的版本号-->
    <dependencyManagement>
        <dependencies>
            <!--EasyPoi-->
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-base</artifactId>
                <version>3.2.0</version>
            </dependency>
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-web</artifactId>
                <version>3.2.0</version>
            </dependency>
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-annotation</artifactId>
                <version>3.2.0</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <!--任何子级项目集成了该父级项目 需要在父级项目的pom.xml文件中做配置-->
    <modules>
        <module>manager</module>
    </modules>

    <groupId>com.baigu</groupId>
    <artifactId>parent</artifactId>
    <version>1.0-SNAPSHOT</version>

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

**
子级manager项目的pom.xml文件

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
        <dependencies>
            <!--EasyPoi-->
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-base</artifactId>
            </dependency>
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-web</artifactId>
            </dependency>
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-annotation</artifactId>
            </dependency>
        </dependencies>

    <!--继承自己的父级项目-->
    <parent>
        <groupId>com.baigu</groupId>
        <artifactId>parent</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <groupId>com.baigu</groupId>
    <artifactId>manager</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>manager</name>
    <description>Demo project for Spring Boot</description>

</project>

在dependencymanager标签中的依赖 子级项目想要继承的话,需要额外声明, 但是可以不写版本号

<!-和ependencyManagement一样-->
<pluginManagement>
    <plugins>

    </plugins>
</pluginManagement>

另外插件的继承类似

**

第三 引用其他同级项目的类或方法

**
新建module 项目名为app,步骤与新建manager类似
父级pom.xml

<!--任何子级项目集成了该父级项目 需要在父级项目的pom.xml文件中做配置-->
    <modules>
        <module>manager</module>
        <module>app</module>
    </modules>

app的pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <!--继承自己的父级项目-->
    <parent>
        <groupId>com.baigu</groupId>
        <artifactId>parent</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <groupId>com.baigu</groupId>
    <artifactId>app</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>app</name>
    <description>Demo project for Spring Boot</description>


</project>

manager的pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
        <dependencies>

            <!--把app项目当作依赖引入当前项目-->
            <dependency>
                <groupId>com.baigu</groupId>
                <artifactId>app</artifactId>
                <version>0.0.1-SNAPSHOT</version>
            </dependency>

            <!--EasyPoi-->
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-base</artifactId>
            </dependency>
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-web</artifactId>
            </dependency>
            <dependency>
                <groupId>cn.afterturn</groupId>
                <artifactId>easypoi-annotation</artifactId>
            </dependency>
        </dependencies>

    <!--继承自己的父级项目-->
    <parent>
        <groupId>com.baigu</groupId>
        <artifactId>parent</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <groupId>com.baigu</groupId>
    <artifactId>manager</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>manager</name>
    <description>Demo project for Spring Boot</description>

</project>

springcloud maven springcloud maven模块之间互相引用_apache_04

springcloud maven springcloud maven模块之间互相引用_springcloud maven_05

**

在app项目中的实体类 manager项目中可以进行访问

**
manager的启动类

package com.baigu;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Component;

@SpringBootApplication
@Component("com.baigu")
public class ManagerApplication {

    public static void main(String[] args) {
        SpringApplication.run(ManagerApplication.class, args);
    }

}

@Component(“com.baigu”)意思表示同级项目调用时,如果包名不一致,加上该注解,并且取前缀一致的包名可以相互调用 所以最好还是取一致的包名