order的规则：

order的值越小，优先级越高

order如果不标注数字，默认最低优先级，因为其默认值是int最大值

该注解等同于实现Ordered接口getOrder方法，并返回数字。

@Retention(RetentionPolicy.RUNTIME)

@Target({ElementType.TYPE, ElementType.METHOD, ElementType.FIELD})

@Documented

public @interface Order {

/**

* The order value.

* <p>Default is {@link Ordered#LOWEST_PRECEDENCE}.

* @see Ordered#getOrder()

*/

int value() default Ordered.LOWEST_PRECEDENCE;

}

 

int LOWEST_PRECEDENCE = Integer.MAX_VALUE;

@Aspect

@Component

public class DataSourceAspect implements Ordered {

@Override

public int getOrder() {

return 1;

}

}

见下： 

OrderRunner1.java

@Component

@Order(1)

public class OrderRunner1 implements CommandLineRunner {

@Override

public void run(String... args) throws Exception {

System.out.println("The OrderRunner1 start to initialize ...");

}

}

 OrderRunner2.java

@Component

@Order(2)

public class OrderRunner2 implements CommandLineRunner {

@Override

public void run(String... args) throws Exception {

System.out.println("The OrderRunner2 start to initialize ...");

}

}

 Runner.java

@Component

public class Runner implements CommandLineRunner {

@Override

public void run(String... args) throws Exception {

System.out.println("The Runner start to initialize ...");

}

}

@SpringBootApplication

public class CommandLineRunnerApplication {

public static void main(String[] args) {

System.out.println("The service to start.");

SpringApplication.run(CommandLineRunnerApplication.class, args);

System.out.println("The service has started.");

}

}

 

它们的启动日志：

The service to start.

...

...

The OrderRunner1 start to initialize ...

The OrderRunner2 start to initialize ...

The Runner start to initialize ...

The service has started.

 

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作者：jiangxwa

来源：CSDN

原文：https://blog.csdn.net/jiangxwa/article/details/87892577

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