Spring中的InitializingBean接口的使用详解

InitializingBean是Spring提供的拓展性接口，InitializingBean接口为bean提供了属性初始化后的处理方法，它只有一个afterPropertiesSet方法，凡是继承该接口的类，在bean的属性初始化后都会执行该方法。

自定义接口a继承InitializingBean

public interface AdvertiserService extends InitializingBean {
}

自定义接口a的实现类b,需额外实现InitializingBean接口的afterPropertiesSet方法.

@Service
public class HuaWeiAdvertiserServiceImpl implements AdvertiserService {
@Override
    public void afterPropertiesSet() throws Exception {
        AdvertiserMapFactory.register(991,this);
    }
}

自定义工厂类,使实现类b启动时注册到工厂中(存入map)

public class AdvertiserMapFactory {
    private static Map advertiserMap = new HashMap<>();

    public static void register(Integer code, AdvertiserService advertiserService){
        advertiserMap.put(code, advertiserService);
    }

    public static AdvertiserService getAdvertiserService(Integer code){
        return advertiserMap.get(code);
    }
}

后续使用接口a的某个实现类时直接去工厂取

AdvertiserService advertiserService = AdvertiserMapFactory.getAdvertiserService(code);