From 38cf77a510cf56e6135b45e28c0302cc28e8824f Mon Sep 17 00:00:00 2001 From: linlei Date: Fri, 26 Apr 2024 15:14:08 +0800 Subject: [PATCH] =?UTF-8?q?ClassFilter=E4=BC=98=E5=8C=96?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- spring-aop/spring-aop-classFilter/README.md | 48 ++++++++++++------- .../java/com/xcs/spring/ClassFilterDemo.java | 18 +++---- ...Annotation.java => MyClassAnnotation.java} | 2 +- .../main/java/com/xcs/spring/MyService.java | 2 +- 4 files changed, 43 insertions(+), 27 deletions(-) rename spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/{MyAnnotation.java => MyClassAnnotation.java} (86%) diff --git a/spring-aop/spring-aop-classFilter/README.md b/spring-aop/spring-aop-classFilter/README.md index c81ec0e..5f49c48 100644 --- a/spring-aop/spring-aop-classFilter/README.md +++ b/spring-aop/spring-aop-classFilter/README.md @@ -113,46 +113,62 @@ TypePatternClassFilter ..> ClassFilter ### 七、最佳实践 -使用不同类型的类过滤器在 Spring AOP 中的使用方式。我们创建了四种不同的类过滤器实例，并测试它们是否匹配了特定的类。通过打印输出结果，展示了每个类过滤器的匹配情况，从而说明了它们在过滤目标类方面的作用。 +使用不同类型的类过滤器（AnnotationClassFilter、TypePatternClassFilter、RootClassFilter）以及基于 AspectJ 表达式的切点（AspectJExpressionPointcut）来匹配目标类，并输出匹配结果。 ```java public class ClassFilterDemo { public static void main(String[] args) { // 创建 AnnotationClassFilter 实例，匹配带有 MyAnnotation 注解的类 - ClassFilter filter1 = new AnnotationClassFilter(MyAnnotation.class); - System.out.println("AnnotationClassFilter 是否匹配 MyService 类：" + filter1.matches(MyService.class)); + ClassFilter annotationClassFilter = new AnnotationClassFilter(MyClassAnnotation.class); + System.out.println("annotationClassFilter matches =" + annotationClassFilter.matches(MyService.class)); // 创建 TypePatternClassFilter 实例，匹配指定类名的类 - ClassFilter filter2 = new TypePatternClassFilter("com.xcs.spring.MyService"); - System.out.println("TypePatternClassFilter 是否匹配 MyService 类：" + filter2.matches(MyService.class)); + ClassFilter typePatternClassFilter = new TypePatternClassFilter("com.xcs.spring.MyService"); + System.out.println("typePatternClassFilter matches =" + typePatternClassFilter.matches(MyService.class)); // 创建 RootClassFilter 实例，匹配指定类的根类 - ClassFilter filter3 = new RootClassFilter(MyService.class); - System.out.println("RootClassFilter 是否匹配 MySubService 的根类：" + filter3.matches(MySubService.class)); + ClassFilter rootClassFilter = new RootClassFilter(MyService.class); + System.out.println("rootClassFilter matches = " + rootClassFilter.matches(MySubService.class)); // 创建 AspectJExpressionPointcut 实例，根据 AspectJ 表达式匹配类和方法 - AspectJExpressionPointcut filter4 = new AspectJExpressionPointcut(); - filter4.setExpression("execution(* com.xcs.spring.MyService.*(..))"); - System.out.println("AspectJExpressionPointcut 是否匹配 MyService 类：" + filter4.matches(MyService.class)); + AspectJExpressionPointcut aspectJExpressionPointcut = new AspectJExpressionPointcut(); + aspectJExpressionPointcut.setExpression("execution(* com.xcs.spring.MyService.*(..))"); + System.out.println("aspectJExpressionPointcut matches = " + aspectJExpressionPointcut.matches(MyService.class)); } } ``` +`MyService` 类被 `@MyClassAnnotation` 注解修饰。 + +```java +@MyClassAnnotation +public class MyService { +} +``` + +`MyClassAnnotation` 注解，应用于类级别的元素。 + +```java +@Retention(RetentionPolicy.RUNTIME) +@Target(ElementType.TYPE) +public @interface MyClassAnnotation { +} +``` + 运行结果，四种不同类型的类过滤器都成功地匹配了相应的目标类。 ```java -AnnotationClassFilter 是否匹配 MyService 类：true -TypePatternClassFilter 是否匹配 MyService 类：true -RootClassFilter 是否匹配 MySubService 的根类：true -AspectJExpressionPointcut 是否匹配 MyService 类：true +annotationClassFilter matches =true +typePatternClassFilter matches =true +rootClassFilter matches = true +aspectJExpressionPointcut matches = true ``` ### 八、常见问题 1. **匹配准确性** - + 可能会出现由于匹配规则不准确导致无法正确匹配目标类的情况。在使用 `ClassFilter` 时，需要确保定义的匹配规则能够准确地选择出目标类，否则可能会导致切面不正确地应用或不应用于预期的类。 - + 2. **匹配范围不一致** + 在定义 `ClassFilter` 时，可能会出现匹配范围不一致的情况。例如，一个切面匹配了目标类的所有方法，而另一个切面只匹配了部分方法。在这种情况下，可能会出现不一致的行为，需要确保所有切面的匹配范围是一致的。 \ No newline at end of file diff --git a/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/ClassFilterDemo.java b/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/ClassFilterDemo.java index 6f79fd9..957aa64 100644 --- a/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/ClassFilterDemo.java +++ b/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/ClassFilterDemo.java @@ -9,20 +9,20 @@ import org.springframework.aop.support.annotation.AnnotationClassFilter; public class ClassFilterDemo { public static void main(String[] args) { // 创建 AnnotationClassFilter 实例，匹配带有 MyAnnotation 注解的类 - ClassFilter filter1 = new AnnotationClassFilter(MyAnnotation.class); - System.out.println("AnnotationClassFilter 是否匹配 MyService 类：" + filter1.matches(MyService.class)); + ClassFilter annotationClassFilter = new AnnotationClassFilter(MyClassAnnotation.class); + System.out.println("annotationClassFilter matches =" + annotationClassFilter.matches(MyService.class)); // 创建 TypePatternClassFilter 实例，匹配指定类名的类 - ClassFilter filter2 = new TypePatternClassFilter("com.xcs.spring.MyService"); - System.out.println("TypePatternClassFilter 是否匹配 MyService 类：" + filter2.matches(MyService.class)); + ClassFilter typePatternClassFilter = new TypePatternClassFilter("com.xcs.spring.MyService"); + System.out.println("typePatternClassFilter matches =" + typePatternClassFilter.matches(MyService.class)); // 创建 RootClassFilter 实例，匹配指定类的根类 - ClassFilter filter3 = new RootClassFilter(MyService.class); - System.out.println("RootClassFilter 是否匹配 MySubService 的根类：" + filter3.matches(MySubService.class)); + ClassFilter rootClassFilter = new RootClassFilter(MyService.class); + System.out.println("rootClassFilter matches = " + rootClassFilter.matches(MySubService.class)); // 创建 AspectJExpressionPointcut 实例，根据 AspectJ 表达式匹配类和方法 - AspectJExpressionPointcut filter4 = new AspectJExpressionPointcut(); - filter4.setExpression("execution(* com.xcs.spring.MyService.*(..))"); - System.out.println("AspectJExpressionPointcut 是否匹配 MyService 类：" + filter4.matches(MyService.class)); + AspectJExpressionPointcut aspectJExpressionPointcut = new AspectJExpressionPointcut(); + aspectJExpressionPointcut.setExpression("execution(* com.xcs.spring.MyService.*(..))"); + System.out.println("aspectJExpressionPointcut matches = " + aspectJExpressionPointcut.matches(MyService.class)); } } diff --git a/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/MyAnnotation.java b/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/MyClassAnnotation.java similarity index 86% rename from spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/MyAnnotation.java rename to spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/MyClassAnnotation.java index 1b4098f..ca95675 100644 --- a/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/MyAnnotation.java +++ b/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/MyClassAnnotation.java @@ -7,5 +7,5 @@ import java.lang.annotation.Target; @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.TYPE) -public @interface MyAnnotation { +public @interface MyClassAnnotation { } diff --git a/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/MyService.java b/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/MyService.java index 63df9cd..4c287ec 100644 --- a/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/MyService.java +++ b/spring-aop/spring-aop-classFilter/src/main/java/com/xcs/spring/MyService.java @@ -1,5 +1,5 @@ package com.xcs.spring; -@MyAnnotation +@MyClassAnnotation public class MyService { }