注解Spring @AliasFor使用笔记

简单注解类

java 复制代码

@Target({ElementType.METHOD, ElementType.ANNOTATION_TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ErasePasswordAnno {
@AliasFor(attribute = "expression")
String value() default "" ;

    String expression() default "" ;
}

嵌套注解类

java 复制代码

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@ErasePasswordAnno
public @interface MapErasePasswordAnno {
    @AliasFor(annotation = ErasePasswordAnno.class, attribute = "value")
    String value() default "['recordList']" ;

    @AliasFor(annotation = ErasePasswordAnno.class, attribute = "expression")
    String expression() default "['recordList']" ;
}

编写测试代码

java 复制代码

@Slf4j
public class AliasForAnnoTest {

    @Test
    void simple() throws NoSuchMethodException {
        Method method = MapErasePasswordAnnoTest.class.getMethod("hello");
        ErasePasswordAnno annotation = AnnotationUtils.getAnnotation(method, ErasePasswordAnno.class);
        Assertions.assertNotNull(annotation);
        log.info("annotation value : {}", annotation.value());
        log.info("annotation expression : {}", annotation.value());
    }

    @Test
    void complex() throws NoSuchMethodException {
        Method method = MapErasePasswordAnnoTest.class.getMethod("hello2");
        ErasePasswordAnno annotation = AnnotatedElementUtils.findMergedAnnotation(method, ErasePasswordAnno.class);
        Assertions.assertNotNull(annotation);
        log.info("annotation value : {}", annotation.value());
        log.info("annotation expression : {}", annotation.value());
    }
    
    @ErasePasswordAnno("username")
    public void hello(){

    }

    @MapErasePasswordAnno
    public void hello2(){

    }
}