自定义Starter

1. META-INF的spring.factories文件配置自动注入配置类

   #-------starter自动装配---------
   org.springframework.boot.autoconfigure.EnableAutoConfiguration =\
   com.mao.springboot.my.springboot.starter.config.MyConfig

   读取yml文件my.前缀的配置数据，注入到MyProperties对象，交spring管理 ```java @Data @ConfigurationProperties(prefix = “my”) @PropertySource(“classpath:my-property.yml”) public class MyProperties {

   private String sayWhat;

   private String toWho;

}

�// 根据配置文件读取到的MyProperties对象的配置信息，进行自动装配MyConfig对象
```java
@Configuration
@EnableConfigurationProperties(MyProperties.class)
@ConditionalOnProperty(
        prefix = "my",
        name = "isopen",
        havingValue = "true"
)
public class MyConfig {

    @Autowired
    private MyProperties myProperties;

    @Bean(name = "my")
    @ConditionalOnMissingBean()
    public MyService myService() {
        return new MyService(myProperties.getSayWhat(), myProperties.getToWho());
    }
}