SpringBoot2.x的Maven依賴配置

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本篇主要說明以下內容：

1.SpringBoot2.x中Maven的配置內容，即：pom.xml的內容說明

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1 Maven依賴的配置方式

使用Maven來配置SpringBoot2.x，有兩種方式：

1.SpringBoot2.x的父依賴，在使用SpringBoot2.x生成器生成的項目中，會是這種方式

2.項目獨立引入SpringBoot2.x的pom依賴

1.1 SpringBoot2.x父依賴

這種方式，項目完整的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>

以上關鍵的配置，如下：

xml節點名稱	說明
parent	標明項目按SpringBoot2.x默認配置來處理
plugin.spring-boot-maven-plugin	對SpringBoot項目進行打包

如果項目中已經有自己的parent，此時，可以使用項目獨立引入的方式。

1.2 項目獨立引入

這種方式是通過pom文件中的dependencyManagement標簽來實現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>
                                   <!-- 程序的主啟動類，即：用@SpringBootApplication注解，包含main方法的類 -->
                                  <mainClass>cc.anxminise.learnspboot.Application</mainClass>
                                 </configuration>
                                <executions>
                                    <execution>
                                        <goals>
                                            <goal>repackage</goal>
                                        </goals>
                                    </execution>
                                </executions>        
			</plugin>
		</plugins>
	</build>

</project>

以上關鍵的配置，如下：

xml節點名稱	說明
dependencyManagement.dependencies.dependency.spring-boot-dependencies	標明項目按SpringBoot2.x默認配置來處理
plugin.spring-boot-maven-plugin	對SpringBoot項目進行打包，這里需要手動配置應用的啟動類

這種方式，相對而言，更為的靈活。