1.1、建立自定義的starter專案手先新增相關依賴

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <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>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

1.2、定義和application.yml 配置檔案繫結資料的配置類

@Data
@ConfigurationProperties(prefix 
 
= "hello")
public class HelloProperties {
    private String name;
    private String address;
}

1.3、定義自動配置的類HelloService,將自動把這個類自動配置

public class HelloService {
    private String name;
    private String address;

    public HelloService(String name, String address) {
        this.name = name;
        
 
this.address = address;
    }

    public String sayHello(){
        return "你好！我的名字叫 " + name + "，我來自 " + address;
    }
}

1.4、標註開啟自動配置 將helloProperties與配置檔案繫結，然後注入給HelloService 完成自動配置

@Configuration
@EnableConfigurationProperties(HelloProperties.class)
public class HelloServiceAutoConfiguration {
    private HelloProperties helloProperties;

    //通過構造方法注入配置屬性物件HelloProperties
    public HelloServiceAutoConfiguration(HelloProperties helloProperties) {
        this.helloProperties = helloProperties;
    }

    //例項化HelloService並載入Spring IoC容器
    @Bean
    @ConditionalOnMissingBean
    public HelloService helloService(){
        return new HelloService(helloProperties.getName(),helloProperties.getAddress());
    }
}

1.5、META-INF/spring.factories 建立該檔案，目的是讓spring啟動時找到這個自動配置

org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.wcs.config.HelloServiceAutoConfiguration

2.1 使用剛才的starts 引入依賴

<dependency>
            <groupId>org.wcs</groupId>
            <artifactId>hello-springboot-starter</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

2.2、編寫配置類

hello:
  name: edwin
  address: dasdsadsa

2.3、測試是否會將編寫的配置類完成自動配置

@RestController
@RequestMapping("/hello")
public class HelloController {
    //HelloService在我們自定義的starter中已經完成了自動配置，所以此處可以直接注入
    @Autowired
    private HelloService helloService;

    @GetMapping("/say")
    public String sayHello(){
        return helloService.sayHello();
    }
}