SpringBoot2.x的Maven依赖配置

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本篇主要说明以下内容：

1.SpringBoot2.x中Maven的配置内容，即：pom.xml的内容说明

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1 Maven依赖的配置方式

使用Maven来配置SpringBoot2.x，有两种方式：

1.SpringBoot2.x的父依赖，在使用SpringBoot2.x生成器生成的项目中，会是这种方式

2.项目独立引入SpringBoot2.x的pom依赖

1.1 SpringBoot2.x父依赖

这种方式，项目完整的pom.xml文件，如下：

<?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>cc.anxminise.spblearn</groupId>
    <artifactId>application</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>application</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.6.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>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

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

</project>

以上关键的配置，如下：

xml节点名称	说明
parent	标明项目按SpringBoot2.x默认配置来处理
plugin.spring-boot-maven-plugin	对SpringBoot项目进行打包

如果项目中已经有自己的parent，此时，可以使用项目独立引入的方式。

1.2 项目独立引入

这种方式是通过pom文件中的dependencyManagement标签来实现SpringBoot的引入，完整的pom.xml文件如下：

<?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>cc.anxminise.spblearn</groupId>
    <artifactId>application</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>application</name>
    <description>Demo project for Spring Boot</description>

    <dependencyManagement>
             <dependencies>
                    <dependency>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-dependencies</artifactId>
                        <version>2.0.6.RELEASE</version>
                        <type>pom</type>
                        <scope>import</scope>
                    </dependency>
            </dependencies>
        </dependencyManagement>

    <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>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                                <configuration>
                                   <!-- 程序的主启动类，即：用@SpringBootApplication注解，包含main方法的类 -->
                                  <mainClass>cc.anxminise.learnspboot.Application</mainClass>
                                 </configuration>
                                <executions>
                                    <execution>
                                        <goals>
                                            <goal>repackage</goal>
                                        </goals>
                                    </execution>
                                </executions>        
            </plugin>
        </plugins>
    </build>

</project>

以上关键的配置，如下：

xml节点名称	说明
dependencyManagement.dependencies.dependency.spring-boot-dependencies	标明项目按SpringBoot2.x默认配置来处理
plugin.spring-boot-maven-plugin	对SpringBoot项目进行打包，这里需要手动配置应用的启动类

这种方式，相对而言，更为的灵活。