<?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">
    <parent>
        <artifactId>springboot-demo</artifactId>
        <groupId>com.et</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>xxx-spring-boot-starter</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-autoconfigure</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies> 

com.person.age=23
com.person.name=Lynch
com.person.sex=F

package com.et.config;

import com.et.service.PersonService;
import com.et.starter.PersonProperties;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration 
@EnableConfigurationProperties(PersonProperties.class)
@ConditionalOnClass(PersonService.class)
@ConditionalOnProperty(prefix = "com.person", value = "enabled", matchIfMissing = true)
public class PersonServiceAutoConfiguration {

    @Autowired
    private PersonProperties properties;

    // if spring container do not config bean，auto config PersonService
    @Bean
    @ConditionalOnMissingBean(PersonService.class)  
    public PersonService personService(){
        PersonService personService = new PersonService(properties);
        return personService;
    }
}

package com.et.service;

import com.et.starter.PersonProperties;

public class PersonService {
    private PersonProperties properties;

    public PersonService() {
    }

    public PersonService(PersonProperties properties) {
        this.properties = properties;
    }

    public void sayHello() {
        String message = String.format("hi，my name: %s, today,I'am %s , gender: %s",
                properties.getName(), properties.getAge(), properties.getSex());
        System.out.println(message);
    }
}

package com.et.starter;

import java.io.Serializable;

import org.springframework.boot.context.properties.ConfigurationProperties;

@SuppressWarnings("serial")
@ConfigurationProperties(prefix = "com.person")
public class PersonProperties implements Serializable {
    private String name;
    private int age;
    private String sex = "M";

    public PersonProperties() {

    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

}

org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.et.config.PersonServiceAutoConfiguration

 mvn clean install

<dependency>
    <groupId>com.et</groupId>
    <artifactId>xxx-spring-boot-starter</artifactId>
    <version>1.0-SNAPSHOT</version>
</dependency>

package com.et.starter;

import com.et.service.PersonService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;


@RunWith(SpringRunner.class)
@SpringBootTest
public class PersonServiceTest {
    @Autowired
    private PersonService personService;

    @Test
    public void testHelloWorld() {
        personService.sayHello();
    }
}