ClassFilter优化
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@ -113,46 +113,62 @@ TypePatternClassFilter ..> ClassFilter
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### 七、最佳实践
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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。
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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。
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```java
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public class ClassFilterDemo {
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public static void main(String[] args) {
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// 创建 AnnotationClassFilter 实例,匹配带有 MyAnnotation 注解的类
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ClassFilter filter1 = new AnnotationClassFilter(MyAnnotation.class);
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System.out.println("AnnotationClassFilter 是否匹配 MyService 类:" + filter1.matches(MyService.class));
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ClassFilter annotationClassFilter = new AnnotationClassFilter(MyClassAnnotation.class);
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System.out.println("annotationClassFilter matches =" + annotationClassFilter.matches(MyService.class));
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// 创建 TypePatternClassFilter 实例,匹配指定类名的类
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ClassFilter filter2 = new TypePatternClassFilter("com.xcs.spring.MyService");
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System.out.println("TypePatternClassFilter 是否匹配 MyService 类:" + filter2.matches(MyService.class));
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ClassFilter typePatternClassFilter = new TypePatternClassFilter("com.xcs.spring.MyService");
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System.out.println("typePatternClassFilter matches =" + typePatternClassFilter.matches(MyService.class));
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// 创建 RootClassFilter 实例,匹配指定类的根类
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ClassFilter filter3 = new RootClassFilter(MyService.class);
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System.out.println("RootClassFilter 是否匹配 MySubService 的根类:" + filter3.matches(MySubService.class));
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ClassFilter rootClassFilter = new RootClassFilter(MyService.class);
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System.out.println("rootClassFilter matches = " + rootClassFilter.matches(MySubService.class));
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// 创建 AspectJExpressionPointcut 实例,根据 AspectJ 表达式匹配类和方法
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AspectJExpressionPointcut filter4 = new AspectJExpressionPointcut();
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filter4.setExpression("execution(* com.xcs.spring.MyService.*(..))");
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System.out.println("AspectJExpressionPointcut 是否匹配 MyService 类:" + filter4.matches(MyService.class));
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AspectJExpressionPointcut aspectJExpressionPointcut = new AspectJExpressionPointcut();
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aspectJExpressionPointcut.setExpression("execution(* com.xcs.spring.MyService.*(..))");
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System.out.println("aspectJExpressionPointcut matches = " + aspectJExpressionPointcut.matches(MyService.class));
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}
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}
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```
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`MyService` 类被 `@MyClassAnnotation` 注解修饰。
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```java
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@MyClassAnnotation
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public class MyService {
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}
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```
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`MyClassAnnotation` 注解,应用于类级别的元素。
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```java
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@Retention(RetentionPolicy.RUNTIME)
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@Target(ElementType.TYPE)
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public @interface MyClassAnnotation {
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}
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```
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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。
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```java
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AnnotationClassFilter 是否匹配 MyService 类:true
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TypePatternClassFilter 是否匹配 MyService 类:true
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RootClassFilter 是否匹配 MySubService 的根类:true
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AspectJExpressionPointcut 是否匹配 MyService 类:true
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annotationClassFilter matches =true
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typePatternClassFilter matches =true
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rootClassFilter matches = true
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aspectJExpressionPointcut matches = true
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```
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### 八、常见问题
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1. **匹配准确性**
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+ 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。
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2. **匹配范围不一致**
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+ 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。
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@ -9,20 +9,20 @@ import org.springframework.aop.support.annotation.AnnotationClassFilter;
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public class ClassFilterDemo {
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public static void main(String[] args) {
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// 创建 AnnotationClassFilter 实例,匹配带有 MyAnnotation 注解的类
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ClassFilter filter1 = new AnnotationClassFilter(MyAnnotation.class);
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System.out.println("AnnotationClassFilter 是否匹配 MyService 类:" + filter1.matches(MyService.class));
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ClassFilter annotationClassFilter = new AnnotationClassFilter(MyClassAnnotation.class);
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System.out.println("annotationClassFilter matches =" + annotationClassFilter.matches(MyService.class));
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// 创建 TypePatternClassFilter 实例,匹配指定类名的类
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ClassFilter filter2 = new TypePatternClassFilter("com.xcs.spring.MyService");
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System.out.println("TypePatternClassFilter 是否匹配 MyService 类:" + filter2.matches(MyService.class));
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ClassFilter typePatternClassFilter = new TypePatternClassFilter("com.xcs.spring.MyService");
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System.out.println("typePatternClassFilter matches =" + typePatternClassFilter.matches(MyService.class));
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// 创建 RootClassFilter 实例,匹配指定类的根类
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ClassFilter filter3 = new RootClassFilter(MyService.class);
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System.out.println("RootClassFilter 是否匹配 MySubService 的根类:" + filter3.matches(MySubService.class));
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ClassFilter rootClassFilter = new RootClassFilter(MyService.class);
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System.out.println("rootClassFilter matches = " + rootClassFilter.matches(MySubService.class));
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// 创建 AspectJExpressionPointcut 实例,根据 AspectJ 表达式匹配类和方法
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AspectJExpressionPointcut filter4 = new AspectJExpressionPointcut();
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filter4.setExpression("execution(* com.xcs.spring.MyService.*(..))");
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System.out.println("AspectJExpressionPointcut 是否匹配 MyService 类:" + filter4.matches(MyService.class));
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AspectJExpressionPointcut aspectJExpressionPointcut = new AspectJExpressionPointcut();
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aspectJExpressionPointcut.setExpression("execution(* com.xcs.spring.MyService.*(..))");
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System.out.println("aspectJExpressionPointcut matches = " + aspectJExpressionPointcut.matches(MyService.class));
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}
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}
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@ -7,5 +7,5 @@ import java.lang.annotation.Target;
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@Retention(RetentionPolicy.RUNTIME)
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@Target(ElementType.TYPE)
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public @interface MyAnnotation {
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public @interface MyClassAnnotation {
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}
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@ -1,5 +1,5 @@
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package com.xcs.spring;
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@MyAnnotation
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@MyClassAnnotation
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public class MyService {
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}
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