springboot order注解

Spring 4.2 利用@Order控制配置类的加载顺序

演示

• 两个演示bean

package com.wisely.spring4_2.order;

public class Demo1Service {

}

package com.wisely.spring4_2.order;

public class Demo2Service {

}

• 两个配置类,注意@Order配置加载的顺序

package com.wisely.spring4_2.order;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;

@Configuration
@Order(2)
public class Demo1Config {
    @Bean
    public Demo1Service demo1Service(){
        System.out.println("demo1config 加载了");
        return new Demo1Service();
    }

}

package com.wisely.spring4_2.order;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;

@Configuration
@Order(1)
public class Demo2Config {

    @Bean
    public Demo2Service demo2Service(){
        System.out.println("demo2config 加载了");
        return new Demo2Service();
    }

}

• 运行

package com.wisely.spring4_2.order;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext("com.wisely.spring4_2.order");
    }

}

输出结果

demo2config 加载了
demo1config 加载了

可以看到，order值越小越先运行