<?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>cn.mystylefree</groupId>
    <artifactId>custom-spring-boot-starter</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
            <version>2.7.0</version>
        </dependency>
    </dependencies>
</project>

     <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
            <version>2.7.0</version>
        </dependency>
    </dependencies>

@EnableConfigurationProperties({PersonProperties.class}) //開啟ConfigurationProperties注解
@ConfigurationProperties(prefix = "person")
public class PersonProperties {
    private int id;
    private String name="章三";
}

@Configuration
//當(dāng)類路徑classpath下有指定當(dāng)類   (SimpleBean)  的情況下進(jìn)行自動(dòng)配置
@ConditionalOnClass(PersonProperties.class)
public class MyAutoConfiguration {
    static {
        System.out.println("MyAutoConfiguration init ...");
    }
    @Bean
    public PersonProperties personProperties(){
        return new PersonProperties();
    }
}

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
cn.mystylefree.config.MyAutoConfiguration

mvn clean install 

         <dependency>
            <groupId>cn.mystylefree</groupId>
            <artifactId>custom-spring-boot-starter</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

person.id=1
person.name=小米

@SpringBootTest
class SpringBootDemoApplicationTests {
    @Autowired
    private PersonProperties personProperties;
    @Test
    void contextLoads() {
        int id = personProperties.getId();
        String name = personProperties.getName();
        System.out.println(id+name);
    }
}

@Data
@ConfigurationProperties(prefix = "custom.user")
@PropertySource(value="classpath:custom.properties", encoding="UTF-8")
public class UserProperties {
//	@Value("${custom.user.name}")
	private String name;
//	@Value("${custom.user.sex}")
	private String sex;
}