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.
---------------------
作者：jiangxwa
来源：CSDN
原文：https://blog.csdn.net/jiangxwa/article/details/87892577
版权声明：本文为博主原创文章，转载请附上博文链接！