通过实例解析Spring组合注解与元注解
人气:0这篇文章主要介绍了通过实例解析Spring组合注解与元注解,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
1、概述
1.1、Spring提供了大量的注解,
尤其是相同的注解用到各个类中,会相当的啰嗦;
1.2、元注解:
可以注解到别的注解上的注解;
组合注解:
被注解注解的注解称为 组合注解;
组合注解 具备 元注解 的功能,Spring的很多注解都可以作为元注解;
1.3、案例
package com.an.config; import com.an.annotation.MyAnnotation; /** * @description: * @author: anpeiyong * @date: Created in 2019/11/21 8:57 * @since: */ @MyAnnotation(value = "com.an") public class AnnotationConfig { }
package com.an.annotation; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; /** * @description: * @author: anpeiyong * @date: Created in 2019/11/21 8:47 * @since: */ @Target(value = ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Configuration @ComponentScan public @interface MyAnnotation { String[] value() default {}; }
package com.an.annotation; import org.springframework.stereotype.Service; /** * @description: * @author: anpeiyong * @date: Created in 2019/11/21 8:54 * @since: */ @Service public class AnnotationService { public void output(){ System.out.println("组合注解成功。。。"); } }
package com.an.main; import com.an.annotation.AnnotationService; import com.an.config.AnnotationConfig; import org.springframework.context.annotation.AnnotationConfigApplicationContext; /** * @description: * @author: anpeiyong * @date: Created in 2019/11/21 8:57 * @since: */ public class AnnotationMainTest { public static void main(String[] args) { AnnotationConfigApplicationContext annotationConfigApplicationContext=new AnnotationConfigApplicationContext(AnnotationConfig.class); AnnotationService annotationService=annotationConfigApplicationContext.getBean(AnnotationService.class); annotationService.output(); annotationConfigApplicationContext.close(); } }
结果:
组合注解成功。。。
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