2.create a class and add @Aspect at the class
package tutorial;
import org.aspectj.lang.annotation.Aspect;
@Aspect
@Component
public class SystemArchitecture {
}
3.declare a pointcut in the class
package tutorial;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
@Aspect
@Component
public class SystemArchitecture {
@Pointcut("execution(* execute(..))")
public void executePointcut() {
}
}
4.declare a before advise in the class and use the "executePointcut" pointcut
package tutorial;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
@Aspect
@Component
public class SystemArchitecture {
@Pointcut("execution(* execute(..))")
public void executePointcut() {
}
@Before("executePointcut()")
public void before() {
System.out.println("Before");
}
}
5.this is already match all class when run method-name is "execute" the advise will auto run at the method before
create a demo class
package tutorial;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Component;
@Component
public class Demo {
public void execute() {
System.out.println("hello world");
}
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext(
"applicationContext.xml");
Demo demo = (Demo) context.getBean("demo");
demo.execute();
}
}
It will be output
Before
hello world
the applicationContext.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:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-2.5.xsd">
<context:annotation-config />
<context:component-scan base-package="tutorial" />
<aop:aspectj-autoproxy />
</beans>