spring aop annotation

PersonDaoImpl.java

package aop.annotation;

import org.springframework.stereotype.Repository;

@Repository("personDao")
public class PersonDaoImpl implements PersonDao {

    @Override
    public void savePerson() {
        System.out.println("savePerson");
    }

}

Transaction.java

package aop.annotation;

import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

/**
 * 
 * @author Hqy
 * @Aspect 标识切面类<aop:config></aop:config>
 * @Pointcut 标注切入点
 */
@Aspect
@Component(value = "transaction")
public class Transaction {
    @Pointcut("execution(* aop.annotation.PersonDaoImpl.*(..))")
    private void trans() {} //切入点签名
    
    @Before("trans()")
    public void beforeMethod() {
        System.out.println("before Method");
    }
    
    @AfterReturning(value="trans()", returning="val")
    public void afterMethod(Object val) {
        System.out.println("return method.");
    }
    
}

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: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-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">

    <!-- 导入spring AOP注解解析器 -->
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
    <!-- 导入类扫描注解解析器 -->
    <context:component-scan base-package="aop.annotation"></context:component-scan>
    
    
    
</beans>