{"id":910,"date":"2020-11-20T18:30:30","date_gmt":"2020-11-20T10:30:30","guid":{"rendered":"http:\/\/prayerlaputa.com\/?p=910"},"modified":"2020-11-20T23:17:43","modified_gmt":"2020-11-20T15:17:43","slug":"spring-%e8%87%aa%e5%ae%9a%e4%b9%89%e6%b3%a8%e8%a7%a3%e6%97%b6%e4%bd%bf%e7%94%a8aliasfor%e6%b3%a8%e8%a7%a3%e5%88%ab%e5%90%8d%e6%97%b6-%e9%bb%98%e8%ae%a4%e5%80%bc%e6%97%a0%e6%b3%95%e8%a2%ab%e8%a6%86","status":"publish","type":"post","link":"http:\/\/prayerlaputa.com\/?p=910","title":{"rendered":"spring \u81ea\u5b9a\u4e49\u6ce8\u89e3\u65f6\u4f7f\u7528AliasFor\u6ce8\u89e3\u522b\u540d\u65f6 \u9ed8\u8ba4\u503c\u65e0\u6cd5\u88ab\u8986\u76d6"},"content":{"rendered":"

\u4e8b\u60c5\u662f\u8fd9\u6837\u5b50\u7684\uff1a<\/span><\/p>\n

\u6211\u60f3\u81ea\u5b9a\u4e49\u4e00\u4e2a\u7f13\u5b58\u6ce8\u89e3\uff0c\u7528\u6765\u7f13\u5b58\u65b9\u6cd5\u8fd4\u56de\u503c\uff0c\u5e76\u4e14\u652f\u6301\u81ea\u5b9a\u4e49\u7f13\u5b58\u8d85\u65f6\u65f6\u95f4\uff0c\u6ce8\u89e3\u5b9a\u4e49\u662f\u8fd9\u6837\uff1a<\/span><\/p>\n

\u200b<\/span>\r\n@Retention<\/span>(RetentionPolicy<\/span>.RUNTIME<\/span>)<\/span>\r\n@Target<\/span>(ElementType<\/span>.METHOD<\/span>)<\/span>\r\n@Inherited<\/span><\/span>\r\npublic<\/span> @interface<\/span> MyCache<\/span> {<\/span>\r\n\u200b<\/span>\r\n \u00a0 \u00a0@AliasFor<\/span>(\"value\"<\/span>)<\/span>\r\n \u00a0 \u00a0int<\/span> expireTime<\/span>() default<\/span> 60<\/span>;<\/span>\r\n\u200b<\/span>\r\n \u00a0 \u00a0@AliasFor<\/span>(\"expireTime\"<\/span>)<\/span>\r\n \u00a0 \u00a0int<\/span> value<\/span>() default<\/span> 60<\/span>;<\/span>\r\n}<\/span><\/pre>\n
<\/p>\n
\u672c\u6765\u53ea\u60f3\u5199\u4e00\u4e2aexpireTime\uff0c\u4f46\u60f3\u7740\u5927\u5bb6\u80af\u5b9a\u80fd\u5077\u61d2\u5c3d\u91cf\u5077\u61d2\u561b\uff0c\u90a3\u6700\u597d\u8fd8\u662f\u652f\u6301 <\/span>@MyCache(50)<\/code><\/span> \u8fd9\u79cd\u5199\u6cd5\u3001\u7701\u53bb\u4e00\u6b65\u3002\u4e8e\u662f\u4e5f\u6709\u4e86\u4e0a\u9762\u7684\u5199\u6cd5\uff0c\u4f7f\u7528spring\u63d0\u4f9b\u7684<\/span>@AliasFor<\/code><\/span>\uff0c\u663e\u5f0f\u7684\u5b9a\u4e49\u4e24\u4e2a\u5c5e\u6027\u4e92\u4e3a\u522b\u540d\uff0c\u76ee\u7684\u5c31\u662f\u5982\u679c\u4e0d\u5728\u6ce8\u89e3\u4e2d\u6307\u5b9a\u5c5e\u6027\uff0c\u5219\u9ed8\u8ba4\u5c31\u662f\u5c06\u503c\u7ed9\u5230\u8d85\u65f6\u65f6\u95f4expireTime\u3002<\/span><\/p>\n
\u8fd9\u6837\u5199\u4e5f\u662f\u770b\u4e86spring\u91cc<\/span>@Transactional<\/code><\/span>\u6ce8\u89e3\u7684\u5b9a\u4e49\uff0c\u6309\u9053\u7406\uff0c\u5e94\u8be5\u662f\u6211\u914d\u7f6e\u4e86 <\/span>@MyCache(50)<\/code><\/span> \u540e\uff0c\u6211\u5728Advice\u4ee3\u7801\u4e2d\u53d6\u8fd9\u4e2a\u6ce8\u89e3\u7684<\/span>expireTime<\/code><\/span>\u5c5e\u6027\u503c\u65f6\uff0c\u5e94\u8be5\u662f\u62ff\u5230<\/span>value<\/code><\/span>\u7684\u503c\uff0c\u537350\uff0c\u4f46\u5b9e\u9645\u6548\u679c\u5374\u4e0d\u662f\u8fd9\u6837\uff0c<\/span>expireTime<\/code><\/span>\u7684\u503c\u4ecd\u4e3a\u9ed8\u8ba4\u768460\u3002<\/span><\/p>\n
\u800c\u6211\u53d6\u503c\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/span><\/p>\n
@Around<\/span>(\"myCache()\"<\/span>)<\/span>\r\npublic<\/span> Object<\/span> around<\/span>(ProceedingJoinPoint<\/span> pjp<\/span>) {<\/span>\r\n \u00a0  ......<\/span>\r\n \u00a0 \u00a0\/\/\u83b7\u53d6\u65b9\u6cd5\u5bf9\u8c61<\/span><\/span>\r\n \u00a0 \u00a0Method<\/span> curMethod<\/span> =<\/span> getMethodByJoinPoint<\/span>(pjp<\/span>, methodSignature<\/span>);<\/span>\r\n \u00a0 \u00a0\/\/\u51fa\u95ee\u9898\u7684\u662f\u8fd9\u4e00\u53e5\uff01<\/span><\/span>\r\n \u00a0 \u00a0Annotation<\/span> annotation<\/span> =<\/span> curMethod<\/span>.getAnnotation<\/span>(MyCache<\/span>.class<\/span>);<\/span>\r\n \u00a0 \u00a0Integer<\/span> expireTime<\/span> =<\/span> (Integer<\/span>) getAnnotationConfig<\/span>(annotation<\/span>, \"expireTime\"<\/span>);<\/span>\r\n \u00a0 \u00a0Integer<\/span> annotationValue<\/span> =<\/span> (Integer<\/span>) getAnnotationConfig<\/span>(annotation<\/span>, \"value\"<\/span>);<\/span>\r\n \u00a0 \u00a0log<\/span>.info<\/span>(\"annotationValue={}, expireTime={}.\"<\/span>, annotationValue<\/span>, expireTime<\/span>);<\/span>\r\n \u00a0  ......<\/span>\r\n}<\/span>\r\n\u200b<\/span>\r\nprivate<\/span> Method<\/span> getMethodByJoinPoint<\/span>(ProceedingJoinPoint<\/span> pjp<\/span>, MethodSignature<\/span> methodSignature<\/span>) throws<\/span> NoSuchMethodException<\/span> {<\/span>\r\n \u00a0 \u00a0Object<\/span> target<\/span> =<\/span> pjp<\/span>.getTarget<\/span>();<\/span>\r\n \u00a0 \u00a0return<\/span> target<\/span>.getClass<\/span>().getMethod<\/span>(methodSignature<\/span>.getName<\/span>(), methodSignature<\/span>.getParameterTypes<\/span>());<\/span>\r\n}<\/span>\r\n\u200b<\/span>\r\nprivate<\/span> Object<\/span> getAnnotationConfig<\/span>(Annotation<\/span> annotation<\/span>, String<\/span> name<\/span>) {<\/span>\r\n \u00a0 \u00a0if<\/span> (null<\/span> ==<\/span> annotation<\/span> ||<\/span> StringUtils<\/span>.isEmpty<\/span>(name<\/span>)) {<\/span>\r\n \u00a0 \u00a0 \u00a0 \u00a0return<\/span> null<\/span>;<\/span>\r\n \u00a0  }<\/span>\r\n\u200b<\/span>\r\n \u00a0 \u00a0try<\/span> {<\/span>\r\n \u00a0 \u00a0 \u00a0 \u00a0return<\/span> annotation<\/span>.annotationType<\/span>().getMethod<\/span>(name<\/span>).invoke<\/span>(annotation<\/span>);<\/span>\r\n \u00a0  } catch<\/span> (NoSuchMethodException<\/span> |<\/span> IllegalAccessException<\/span> |<\/span> InvocationTargetException<\/span> e<\/span>) {<\/span>\r\n \u00a0 \u00a0 \u00a0 \u00a0log<\/span>.error<\/span>(\"getAnnotationConfig error:\"<\/span>, e<\/span>);<\/span>\r\n \u00a0  }<\/span>\r\n\u200b<\/span>\r\n \u00a0 \u00a0return<\/span> null<\/span>;<\/span>\r\n}<\/span><\/pre>\n
\u83b7\u53d6\u6ce8\u89e3\u8fd9\u4e00\u6b65\u6709\u95ee\u9898\uff0c<\/span>@AliasFor<\/code><\/span>\u662fspring\u63d0\u4f9b\u7684\u6ce8\u89e3\uff0c\u60f3\u8981\u4fdd\u8bc1\u83b7\u53d6\u5c5e\u6027\u503c\u80fd\u611f\u77e5\u5230\uff0c\u9700\u8981\u4f7f\u7528spring\u63d0\u4f9b\u7684\u5de5\u5177\u65b9\u6cd5\u83b7\u5f97\u6ce8\u89e3\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/span><\/p>\n
......<\/span>\r\nAnnotation<\/span> annotation2<\/span> =<\/span> AnnotationUtils<\/span>.getAnnotation<\/span>(curMethod<\/span>, MyCache<\/span>.class<\/span>);<\/span>\r\nInteger<\/span> annotationVal2<\/span> =<\/span> (Integer<\/span>) getAnnotationConfig<\/span>(annotation2<\/span>, \"expireTime\"<\/span>);<\/span>\r\nlog<\/span>.info<\/span>(\"annotationVal2={}.\"<\/span>, annotationVal2<\/span>);<\/span>\r\n......<\/span><\/pre>\n
\u8fdb\u4e00\u6b65\u5ef6\u4f38\uff1a\u5982\u679c\u6ce8\u89e3\u91cc\u7684\u4e24\u4e2a\u5c5e\u6027\u76f8\u4e92\u52a0\u522b\u540d\u540e\uff0c\u4f7f\u7528\u6ce8\u89e3\u65f6\u4e24\u4e2a\u90fd\u8bbe\u7f6e\u4e86\u503c\uff0c\u4f1a\u600e\u6837\uff1f<\/span><\/h3>\n
\u7c7b\u4f3c\u8fd9\u6837\uff1a<\/span><\/p>\n
@MyCache<\/span>(expireTime<\/span> =<\/span> 40<\/span>, value<\/span> =<\/span> 50<\/span>)<\/span>\r\npublic<\/span> String<\/span> getValByCache<\/span>(String<\/span> key<\/span>) {<\/span>\r\n \u00a0 \u00a0log<\/span>.info<\/span>(\"getValByCache running...\"<\/span>);<\/span>\r\n \u00a0 \u00a0return<\/span> key<\/span> +<\/span> \"-\"<\/span> +<\/span> idx<\/span>.incrementAndGet<\/span>();<\/span>\r\n}<\/span><\/pre>\n
\u7a0b\u5e8f\u76f4\u63a5\u65e0\u6cd5\u542f\u52a8\uff01<\/span><\/strong><\/span>\u4f1a\u62a5\u5982\u4e0b\u5f02\u5e38\uff1a<\/span><\/p>\n
......<\/span>\r\n2020-11-20 16:54:18.628  INFO 12076 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'<\/span>\r\n2020-11-20 16:54:18.878  WARN 12076 --- [  restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: file [D:\\GitRepository\\framework-dev-learning\\spring-aop-2-customzed-cache-annotation\\target\\classes\\com\\prayerlaputa\\service\\MyCacheDemoService.class]; nested exception is org.springframework.core.annotation.AnnotationConfigurationException: Different @AliasFor mirror values for annotation [com.prayerlaputa.annotation.MyCache] declared on com.prayerlaputa.service.MyCacheDemoService.getValByCache(java.lang.String); attribute 'expireTime' and its alias 'value' are declared with values of [40] and [50].<\/span>\r\n2020-11-20 16:54:18.945 ERROR 12076 --- [  restartedMain] o.s.boot.SpringApplication \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 : Application run failed<\/span>\r\n\u200b<\/span>\r\norg.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: file [D:\\GitRepository\\framework-dev-learning\\spring-aop-2-customzed-cache-annotation\\target\\classes\\com\\prayerlaputa\\service\\MyCacheDemoService.class]; nested exception is org.springframework.core.annotation.AnnotationConfigurationException: Different @AliasFor mirror values for annotation [com.prayerlaputa.annotation.MyCache] declared on com.prayerlaputa.service.MyCacheDemoService.getValByCache(java.lang.String); attribute 'expireTime' and its alias 'value' are declared with values of [40] and [50].<\/span>\r\n    at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents(ClassPathScanningCandidateComponentProvider.java:452) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:315) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:276) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:132) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:295) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:249) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:206) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:174) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:319) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:236) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:706) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:532) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]<\/span>\r\n    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]<\/span>\r\n    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]<\/span>\r\n    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]<\/span>\r\n    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]<\/span>\r\n    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]<\/span>\r\n    at com.prayerlaputa.SpringAopApplication.main(SpringAopApplication.java:10) [classes\/:na]<\/span>\r\n    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_161]<\/span>\r\n    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_161]<\/span>\r\n    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_161]<\/span>\r\n    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_161]<\/span>\r\n    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.2.6.RELEASE.jar:2.2.6.RELEASE]<\/span>\r\nCaused by: org.springframework.core.annotation.AnnotationConfigurationException: Different @AliasFor mirror values for annotation [com.prayerlaputa.annotation.MyCache] declared on com.prayerlaputa.service.MyCacheDemoService.getValByCache(java.lang.String); attribute 'expireTime' and its alias 'value' are declared with values of [40] and [50].<\/span>\r\n    at org.springframework.core.annotation.AnnotationTypeMapping$MirrorSets$MirrorSet.resolve(AnnotationTypeMapping.java:656) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.core.annotation.AnnotationTypeMapping$MirrorSets.resolve(AnnotationTypeMapping.java:611) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.core.annotation.TypeMappedAnnotation.<init>(TypeMappedAnnotation.java:136) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.core.annotation.TypeMappedAnnotation.<init>(TypeMappedAnnotation.java:120) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.core.annotation.TypeMappedAnnotation.of(TypeMappedAnnotation.java:636) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.core.annotation.MergedAnnotation.of(MergedAnnotation.java:596) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.core.type.classreading.MergedAnnotationReadingVisitor.visitEnd(MergedAnnotationReadingVisitor.java:96) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.asm.ClassReader.readElementValues(ClassReader.java:2985) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.asm.ClassReader.readMethod(ClassReader.java:1393) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.asm.ClassReader.accept(ClassReader.java:718) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.asm.ClassReader.accept(ClassReader.java:401) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.core.type.classreading.SimpleMetadataReader.<init>(SimpleMetadataReader.java:50) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.core.type.classreading.SimpleMetadataReaderFactory.getMetadataReader(SimpleMetadataReaderFactory.java:103) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.core.type.classreading.CachingMetadataReaderFactory.getMetadataReader(CachingMetadataReaderFactory.java:123) ~[spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.scanCandidateComponents(ClassPathScanningCandidateComponentProvider.java:428) ~[spring-context-5.2.5.RELEASE.jar:5.2.5.RELEASE]<\/span>\r\n    ... 25 common frames omitted<\/span>\r\n\u200b<\/span>\r\n\u200b<\/span>\r\nProcess finished with exit code 0<\/span>\r\n\u200b<\/span><\/pre>\n
\u53c2\u8003\u8d44\u6599<\/span><\/h2>\n