AspectJ不与@Before合作(AspectJ not working with @Before)

我不知道为什么这个简单的应用程序不起作用。一切都正确连接在一起，我没有得到任何错误。我只是想尝试使用AspectJ来调用另一个方法。

package com.springpractice.app; import org.springframework.context.support.ClassPathXmlApplicationContext; public class App { public static void main(String[] args) { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("com/springpractice/app/Beans.xml"); Camera camera = (Camera) context.getBean("camera"); try { camera.snap(); camera.snap(100); } catch (Exception e) { System.out.println("Caught Exception "+ e.getMessage()); } context.close(); } }

Camera.java

package com.springpractice.app; import org.springframework.stereotype.Component; @Component("camera") public class Camera implements PhotoSnapper { public Camera(){ //System.out.println("Hello from constructor"); } void snap(){ System.out.println("Snaped a picture..."); } void snap(int exposure){ System.out.println("Exposure.."+exposure); } }

Logger.java

package com.springpractice.app; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.springframework.stereotype.Component; @Aspect @Component("logger") public class Logger { @Pointcut("execution(* com.springpractice.app.Camera.snap(..))") public void cameraSnap(){ } @Before("cameraSnap()") public void aboutToTakePicture(){ System.out.println("About to take a picture"); } }

beans.xml中

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd"> <context:annotation-config></context:annotation-config> <context:component-scan base-package="com.springpractice.app"></context:component-scan> <aop:aspectj-autoproxy /> </beans>

的pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.spring.proxies</groupId> <artifactId>Proxies_Practice</artifactId> <version>0.0.1-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjrt</artifactId> <version>1.8.5</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.5</version> </dependency> </dependencies> </project>

产量

Snaped a picture... Exposure..100

I have no idea why this simple application is not working. Everything is wire together correctly and I am not getting any errors. I am just trying to use AspectJ to call a method before another.

package com.springpractice.app; import org.springframework.context.support.ClassPathXmlApplicationContext; public class App { public static void main(String[] args) { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("com/springpractice/app/Beans.xml"); Camera camera = (Camera) context.getBean("camera"); try { camera.snap(); camera.snap(100); } catch (Exception e) { System.out.println("Caught Exception "+ e.getMessage()); } context.close(); } }

Camera.java

package com.springpractice.app; import org.springframework.stereotype.Component; @Component("camera") public class Camera implements PhotoSnapper { public Camera(){ //System.out.println("Hello from constructor"); } void snap(){ System.out.println("Snaped a picture..."); } void snap(int exposure){ System.out.println("Exposure.."+exposure); } }

Logger.java

package com.springpractice.app; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.springframework.stereotype.Component; @Aspect @Component("logger") public class Logger { @Pointcut("execution(* com.springpractice.app.Camera.snap(..))") public void cameraSnap(){ } @Before("cameraSnap()") public void aboutToTakePicture(){ System.out.println("About to take a picture"); } }

beans.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd"> <context:annotation-config></context:annotation-config> <context:component-scan base-package="com.springpractice.app"></context:component-scan> <aop:aspectj-autoproxy /> </beans>

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.spring.proxies</groupId> <artifactId>Proxies_Practice</artifactId> <version>0.0.1-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>4.1.6.RELEASE</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjrt</artifactId> <version>1.8.5</version> </dependency> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.8.5</version> </dependency> </dependencies> </project>

output

Snaped a picture... Exposure..100

最满意答案

snap方法需要成为公共API的一部分。

package com.springpractice.app; import org.springframework.stereotype.Component; @Component("camera") public class Camera implements PhotoSnapper { public Camera() { //System.out.println("Hello from constructor"); } public void snap() { System.out.println("Snaped a picture..."); } public void snap(int exposure) { System.out.println("Exposure.."+exposure); } }

The snap methods need to be part of the public API.

package com.springpractice.app; import org.springframework.stereotype.Component; @Component("camera") public class Camera implements PhotoSnapper { public Camera() { //System.out.println("Hello from constructor"); } public void snap() { System.out.println("Snaped a picture..."); } public void snap(int exposure) { System.out.println("Exposure.."+exposure); } }

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