maven多模塊項目結構

maven多模塊結構
Maven多模塊項目,適用於一些比較大的項目，通過合理的模塊拆分，實現代碼的複用，便於維護和管理。一個父項目(app-parent)聚合很多子項目（app-util, app-dao, app-service, app-web）。每個項目，不管是父子，都含有一個pom.xml文件。而且要注意的是，小括號中標出了每個項目的打包類型。父項目是pom,也只能是pom。子項目有jar，或者war。
這些模塊的依賴關係如下：
app-dao --> app-util
app-service --> app-dao
app-web --> app-service
注意依賴的傳遞性（大部分情況是傳遞的，除非你配置了特殊的依賴scope），app-dao依賴於app-util，app-service依賴於app-dao，於是app-service也依賴於app-util。同理，app-web依賴於app-dao,app-util。

springboot多模塊項目搭建步驟：
例如要搭建的項目的目錄:
主項目 springboot-multi
子模塊 entity、dao、service、web
1. 使用IDEA創建一個SpringBoot項目 : File -> new -> Project 項目名稱爲springboot-multi；
2. 刪除項目中的src目錄，把pom.xml中的項目打包方式改爲pom，如下：
<groupId>com.example</groupId>
   <artifactId>springboot-multi</artifactId>
   <version>0.0.1-SNAPSHOT</version>
   
   <packaging>pom</packaging>
3. 創建springboot-multi項目的子模塊，在項目上右鍵單擊，選擇：new -> Module

項目結構如下：

主項目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>

    <groupId>com.example</groupId>
    <artifactId>springboot-multi</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>web</module>
        <module>service</module>
        <module>dao</module>
        <module>entity</module>
    </modules>
    <packaging>pom</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.10.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

    <!--指定使用maven打包-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.19.1</version>
                <configuration>
                    <skipTests>true</skipTests>    <!--默認關掉單元測試 -->
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

web模塊pom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">
    <parent>
        <artifactId>springboot-multi</artifactId>
        <groupId>com.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>web</artifactId>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>service</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>dao</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>entity</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

    <!--spring boot打包的話需要指定一個唯一的入門-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <!-- 指定該Main Class爲全局的唯一入口 -->
                    <mainClass>com.example.WebApplication</mainClass>
                    <layout>ZIP</layout>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal><!--可以把依賴的包都打包到生成的Jar包中-->
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

service模塊pom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">
    <parent>
        <artifactId>springboot-multi</artifactId>
        <groupId>com.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>service</artifactId>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>dao</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>entity</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

dao模塊pom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">
    <parent>
        <artifactId>springboot-multi</artifactId>
        <groupId>com.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dao</artifactId>
    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>entity</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

entity模塊pom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">
    <parent>
        <artifactId>springboot-multi</artifactId>
        <groupId>com.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>entity</artifactId>
    <packaging>jar</packaging>


</project>

web子模塊下啓動類：

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

/**
 * @Auther: 13213
 * @Date: 2020/5/21 10:20
 * @Description:
 */
@RestController
@SpringBootApplication
public class WebApplication {
    public static void main(String[] args) {
        SpringApplication.run(WebApplication.class, args);
    }
    @RequestMapping(value = "/test",method = RequestMethod.GET)
    public String test(){
        return "test success";
    }
}

項目啓動：

運行測試：

對項目打包，mvn clean package：

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