SpringBoot2.0.2 不使用parent作为maven单继承方式操作 : org.springframework.boot : spring-boot-dependencies : 2.0.2.RELEASE

1、pom配置方式

<?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.springboot</groupId>
    <artifactId>quick_start</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>quick_start</name>
    <url>http://maven.apache.org</url>
    <description>Demo project for Spring Boot</description>

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

    <dependencies>
        <!--不使用parent方式进行依赖,需要scope和type设置-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-dependencies</artifactId>
            <version>2.0.2.RELEASE</version>
            <scope>import</scope>
            <type>pom</type>
        </dependency>


        <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>
        </dependency>
    </dependencies>

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


</project>

2、实体类编写

package com.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.context.annotation.Bean;

/******************************
 * @Author : liuyang
 * @ClassName : QuickStartApplication
 * @Date : 2018 五月  20
 * @Time : 01:05:59
 * @Type : SpringBoot
 * @Version : 1.0
 * @Return :
 * @Description :
 *******************************/

@SpringBootApplication
public class QuickStartApplication {

    @Bean
    public Runnable createRunnable() {

        return () -> {
            System.out.println("Spring Boot is Run");
        };

    }

    public static void main(String[] args) {
        ConfigurableApplicationContext applicationContext = SpringApplication.run(QuickStartApplication.class,args);
        applicationContext.getBean(Runnable.class).run();
    }
}

源码存放：
      需要将parent部分注释掉
        https://github.com/liushaoye/quick_start

这个在官方文档上也有具体写:

                 https://docs.spring.io/spring-boot/docs/2.0.2.RELEASE/reference/htmlsingle/#boot-documentation

仔细阅读这一段就是具体解答