bean依赖属性配置

bean依赖属性配置

@Data
@ConfigurationProperties(prefix = "cartoon")
public class CartoonProperties {
    private Cat cat;
    private  Mouse mouse;
}

cartoon:
  cat:
    name: what
    age: 5
  mouse:
    name: how
    age: 6

这样的话，业务bean无需在读取配置文件的操作了。

EnableConfigurationProperties来设置关联，在使用时加载bean，不用时不加载

@EnableConfigurationProperties(CartoonProperties.class)//关联注解 强制设置哪一个类成为bean
@Data
public class CartoonCatAndMouse {
    private Cat cat;
    private  Mouse mouse;

    @Autowired
    private CartoonProperties cartoonProperties;

    public CartoonCatAndMouse(CartoonProperties cartoonProperties){
        this.cartoonProperties = cartoonProperties;
        cat = new Cat();
        cat.setName(cartoonProperties.getCat()!=null && StringUtils.hasText(cartoonProperties.getCat().getName())?cartoonProperties.getCat().getName():"tom");
        cat.setAge(cartoonProperties.getCat()!=null && cartoonProperties.getCat().getAge()!=null ?cartoonProperties.getCat().getAge():3);
        mouse = new Mouse();
        mouse.setName(cartoonProperties.getMouse()!=null && StringUtils.hasText(cartoonProperties.getMouse().getName())?cartoonProperties.getMouse().getName():"jerry");
        mouse.setAge(cartoonProperties.getMouse()!=null && cartoonProperties.getMouse().getAge()!=null ?cartoonProperties.getMouse().getAge():4);
    }

    public void play(){
        System.out.println(cat.getAge() + "岁的"+cat.getName()+ "和"
                + mouse.getAge()  + "岁的" + mouse.getName() + "打起来了");
    }
}

也可以把业务类的@Component注解取消
启动时，添加注解@Import(CartoonCatAndMouse.class)，根据需要来配置bean

@SpringBootApplication
@Import(CartoonCatAndMouse.class)
public class Springboot29BeanPropertiesApplication {

    public static void main(String[] args) {
        ConfigurableApplicationContext ctx = SpringApplication.run(Springboot29BeanPropertiesApplication.class, args);
        CartoonCatAndMouse bean = ctx.getBean(CartoonCatAndMouse.class);
        bean.play();
    }

}

视频链接：
https://www.bilibili.com/video/BV15b4y1a7yG/?p=155&spm_id_from=pageDriver&vd_source=f6debc5a79e3f424f9dde2f13891b158