order的規則：
order的值越小，優先級越高
order如果不標注數字，默認最低優先級，因為其默認值是int最大值
該注解等同於實現Ordered接口getOrder方法，並返回數字。
@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;
}
}
見下：
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.");
}
}
它們的啟動日志：
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
來源：CSDN
原文：https://blog.csdn.net/jiangxwa/article/details/87892577
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