spring 或者spring boot 調整bean 的加載順序

https://blog.csdn.net/zhongzunfa/article/details/81988807

spring 或者spring boot 調整bean 的加載順序。
接下來講解三種調整類加載順序的方式：
1、使用@Order調整配置類加載順序

@Configuration
@Order(1)
public class ConfigA {
    @Bean
    public ServiceA serviceA(){
        System.out.println("ConfigA 執行");
        return new ServiceA();
    }
}
@Configuration
@Order(2)
public class ConfigB {
    @Bean
    public ServiceB serviceB(){
        System.out.println("ConfigB 執行");
        return new ServiceB();
    }
}

2、使用@Order調整配置類加載順序

@Configuration
public class Config {
    @Bean
    @Order(1)
    public CListener bListener(){
        return new CListener();
    }

     @Bean
     @Order(2)
    public DListener dListener(){
        return new DListener();
    }
}

3、實現ordered 接口：

public class AListener implements ApplicationListener<ContextRefreshedEvent>, Ordered {

    private CuratorManagerComponent curatorManagerComponent;

    @Override
    public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {

        logger.info("AListener 執行了。");

    }

    @Override
    public int getOrder() {

        return HIGHEST_PRECEDENCE;
    }
}


public class BListener implements ApplicationListener<ContextRefreshedEvent>, Ordered {

    private CuratorManagerComponent curatorManagerComponent;

    @Override
    public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {

        logger.info("BListener 執行了。");

    }

    @Override
    public int getOrder() {

        return HIGHEST_PRECEDENCE + 2;
    }
}

@Configuration
public class Config {

    @Bean
    public BListener bListener(){
        return new BListener();
    }

     @Bean
    public AListener aListener(){
        return new AListener();
    }
}

對於實現ordered方式， 的需要在 getOrder 返回數值， 數值越小說明優先級越高。