1。概述

Spring Boot 提供父 POM 以便更轻松地创建 Spring Boot 应用程序。

不是每个人都喜欢从 spring-boot-starter-parent POM 继承来创建可执行的 jar/war。您可能需要使用自己的公司标准父级，或者您可能更喜欢显式声明所有 Maven 配置。在本教程中，我们将演示如何在没有父 pom 的情况下使用 Maven 创建可执行的 jar/war。

2。 Spring Boot 没有父 POM

我们使用 Apache Maven 来构建和管理我们的项目依赖项。这次我们不继承自 spring-boot-starter-parent，而是包含一个 dependencyManagement BOM。使用此 BOM 时，我们需要包含 repackage 目标以创建可执行的 jar/war 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>

	<groupId>com.dailycodebuffer.example</groupId>
	<artifactId>Spring-Boot-Custom-Parent</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>Spring-Boot-Custom-Parent</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>11</java.version>
	</properties>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-dependencies</artifactId>
				<version>2.2.0.RELEASE</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

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

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
					<mainClass>com.dailycodebuffer.example.SpringBootCustomParen.SpringBootCustomParentApplication</mainClass>
				</configuration>
				<executions>
					<execution>
						<goals>
							<goal>repackage</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>

</project>

接下来，我们可以开始简单地开始添加 Spring 依赖项并使用 Spring Boot 功能：

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

引导 Spring Boot

为了说明这个例子，我们创建了一个简单的类，它将一些基本的输出打印到控制台。

@SpringBootApplication
public class SpringBootCustomParentApplication {

	private static Logger log = LoggerFactory.getLogger(SpringBootCustomParentApplication.class);

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

	@PostConstruct
	private void init(){
		log.info("creating an executable jar/war with spring boot without parent pom");
	}
}

输出

前面的应用程序生成以下输出。

.   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.2.0.RELEASE)

2019-11-02 00:59:11.383  INFO 7552 --- [           main] .d.e.S.SpringBootCustomParentApplication : Starting SpringBootCustomParentApplication on Shabbir with PID 7552 (E:\DailyCodeBuffer\Codes\Spring-MVC-Tutorials\Spring-Boot-Custom-Parent\target\classes started by shabb in E:\DailyCodeBuffer\Codes\Spring-MVC-Tutorials\Spring-Boot-Custom-Parent)
2019-11-02 00:59:11.431  INFO 7552 --- [           main] .d.e.S.SpringBootCustomParentApplication : No active profile set, falling back to default profiles: default
2019-11-02 00:59:15.580  INFO 7552 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2019-11-02 00:59:15.605  INFO 7552 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2019-11-02 00:59:15.606  INFO 7552 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.27]
2019-11-02 00:59:15.908  INFO 7552 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2019-11-02 00:59:15.908  INFO 7552 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 4107 ms
2019-11-02 00:59:16.019  INFO 7552 --- [           main] .d.e.S.SpringBootCustomParentApplication : creating an executable jar/war with spring boot without parent pom
2019-11-02 00:59:16.575  INFO 7552 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-11-02 00:59:17.029  INFO 7552 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2019-11-02 00:59:17.042  INFO 7552 --- [           main] .d.e.S.SpringBootCustomParentApplication : Started SpringBootCustomParentApplication in 6.993 seconds (JVM running for 9.981)
2019-11-02 00:59:42.356  INFO 7552 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2019-11-02 00:59:42.357  INFO 7552 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2019-11-02 00:59:42.382  INFO 7552 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 25 ms

3 总结

在本快速教程中，我们了解了如何在没有父级 pom.xml 的情况下使用 Spring Boot。

示例的源代码可以在 over on GitHub 中找到。