spring或spring boot怎么调整bean加载顺序-java教程-PHP中文网

spring或spring boot怎么调整bean加载顺序

WBOY

发布： 2023-05-11 12:10:13

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spring 或者spring boot 调整bean 的加载顺序

接下来讲解三种调整类加载顺序的方式：

1、使用@Order调整配置类加载顺序

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

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2、使用@Order调整配置类加载顺序

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

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

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3、实现ordered 接口：

public class AListener implements ApplicationListener<ContextRefreshedEvent>, Ordered {

    private CuratorManagerComponent curatorManagerComponent;

    @Override
    public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {

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

    }

    @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 执行了。");

    }

    @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();
    }
}

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对于实现ordered方式，的需要在 getOrder 返回数值，数值越小说明优先级越高。