spring-boot-starter 是怎么来的？

1.创建一个maven项目

 2.pom文件加入应用的依赖

<?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.imooc.springboot</groupId>
    <artifactId>split-spring-boot-starter</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starters</artifactId>
        <version>2.1.4.RELEASE</version>
    </parent>

    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
        </dependency>
    </dependencies>

</project>

3.ISplitService.java

public interface ISplitService {
    List<String> split(String value);
}

4.SplitServiceImpl.java

public class SplitServiceImpl implements ISplitService {
    @SuppressWarnings("all")
    @Override
    public List<String> split(String value) {
        return Stream.of(StringUtils.split(value,","))
                .collect(Collectors.toList());
    }
}

 5.SplitAutoConfigure.java

@Configuration
@ConditionalOnClass(value = {ISplitService.class, SplitServiceImpl.class})
public class SplitAutoConfigure {

    @Bean
    @ConditionalOnMissingBean
    ISplitService starterServer() {
        return new SplitServiceImpl();
    }
}

 6.META-INF/spring.factories

org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.imooc.springboot.configure

以上内容 码云 代码地址： https://gitee.com/l23456789o/split-spring-boot-starter.git

7.把项目打包 装载到本地

打包成功：

8.在另一个项目中加入自制的starter

<!--自制的springboot启动器-->
        <dependency>
            <groupId>com.imooc.springboot</groupId>
            <artifactId>split-spring-boot-starter</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

9.测试

@Slf4j
@SpringBootTest
@RunWith(SpringRunner.class)
public class SplitServiceTest {
    @Autowired
    private ISplitService splitService;
//    @Autowired
//    private SpringBootConfig springBootConfig;

    @Test
    public void testSplitVersion() {

//        log.info("splitService========>",splitService.split("1,2,3"));
//        log.info("splitService========>",splitService.split("1,2,3"));
//        log.info("springBootConfig========>",springBootConfig.getVersion());
//        log.info("split version: {}", JSON.toJSONString(splitService.split(springBootConfig.getVersion())));
        log.info("split version: {}", JSON.toJSONString(splitService.split("1,2,3")));
    }
}

10.测试结果