SpringBoot之Order注解启动顺序

小咪咪 2021-11-01 03:36 607阅读 0赞

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！

转载于:https://www.cnblogs.com/shew/p/11258995.html