java：spring【AnnotationMetadata】的简单使用例子

# 项目代码资源：

可能还在审核中，请等待。。。
https://download.csdn.net/download/chenhz2284/89435385

# 项目代码

【pom.xml】

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><version>2.3.12.RELEASE</version>
</dependency>
<dependency><groupId>ch.qos.logback</groupId><artifactId>logback-classic</artifactId><version>1.2.11</version>
</dependency>

【application.properties】

server.port=8080
spring.application.name=myBeanMainmanagement.server.port=7001
management.endpoints.web.exposure.include=*

【Annotation1.java】

package com.chz.myBeanMain.annotations;@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface Annotation1 {String name() default "Annotation1-name";String p1() default "Annotation1-p1";
}

【Annotation2.java】

package com.chz.myBeanMain.annotations;@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
@Annotation1(name = "at Annotation2: Annotation1-name")
public @interface Annotation2 {String name() default "Annotation2-name";}

【Annotation3.java】

package com.chz.myBeanMain.annotations;@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface Annotation3 {String name() default "Annotation2-name";
}

【BranchCommonImportSelector.java】

package com.chz.myBeanMain.imports.importSelector;@Slf4j
public class BranchCommonImportSelector implements ImportSelector
{@Overridepublic String[] selectImports(AnnotationMetadata annotationMetadata){log.info("chz >>> BranchCommonImportSelector.selectImports()");MyBeanMainTest2.test(annotationMetadata);return new String[]{};}
}

【MyBeanMainTest.java】

package com.chz.myBeanMain;@Annotation1(name = "at MyBeanMainTest: Annotation1-name")
@Annotation2(name = "at MyBeanMainTest: Annotation2-name")
@Import(BranchCommonImportSelector.class)
@SpringBootApplication
public class MyBeanMainTest {@Annotation1(name = "at main() method")public static void main(String[] args) {SpringApplication.run(MyBeanMainTest.class, args);}@Annotation1(name = "at test1() method")public static void test1(){}@Annotation2(name = "at test2() method")public static void test2(){}@Annotation3(name = "at test3() method")public static void test3(){}
}

【MyBeanMainTest2.java】

package com.chz.myBeanMain;public class MyBeanMainTest2 {public static void main(String[] args) throws Exception{// 生成【MyBeanMainTest.class】的【AnnotationMetadata】AnnotationMetadata annotationMetadata = AnnotationMetadata.introspect(MyBeanMainTest.class);MyBeanMainTest2.test(annotationMetadata);}public static void test(AnnotationMetadata annotationMetadata){StandardAnnotationMetadata standardAnnotationMetadata = (StandardAnnotationMetadata)annotationMetadata;// 获取注解【Annotation1】的所有属性值System.out.println("################################################################");Map<String, Object> annotationAttributes = standardAnnotationMetadata.getAnnotationAttributes(Annotation1.class.getName(), false);System.out.println(annotationAttributes);// 合并所有的注解MergedAnnotations mergedAnnotations = standardAnnotationMetadata.getAnnotations();// 获取注解【Annotation1】上的【name】属性值System.out.println("################################################################");MergedAnnotation<Annotation1> annotation1MergedAnnotation = mergedAnnotations.get(Annotation1.class);String name = annotation1MergedAnnotation.getString("name");System.out.println(name);// 获取主程序类的所有注解名(去重)System.out.println("################################################################");Set<String> annotationTypes = standardAnnotationMetadata.getAnnotationTypes();System.out.println(annotationTypes);// 列出【MyBeanMainTest】类的所有注解，包括注解的注解System.out.println("################################################################");for( MergedAnnotation<Annotation> mergedAnnotation : mergedAnnotations ){System.out.println(mergedAnnotation.getType());}// 获取被【Annotation1】注解的所有方法System.out.println("################################################################");Set<MethodMetadata> annotatedMethods = standardAnnotationMetadata.getAnnotatedMethods(Annotation1.class.getName());for( MethodMetadata methodMetadata : annotatedMethods ){System.out.println("-----------------------");System.out.println(methodMetadata.getMethodName());System.out.println(methodMetadata.getAnnotationAttributes(Annotation1.class.getName()));}}
}