package com.itheima.jdk;
public interface UserDao {
	public void addUser();
	public void deleteUser();
}

package com.itheima.jdk;
import org.springframework.stereotype.Repository;
@Repository("userDao")
public class UserDaoImpl implements UserDao {// 目标类
	public void addUser() {
		//int i = 10/0;
		System.out.println("添加用户");  //待被增强的方法
	}
	public void deleteUser() {
		System.out.println("删除用户");
	}
}

package com.itheima.aspectj.annotation;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
@Aspect  //以定义个切面类，在此类中编写通知
@Component   //用@Aspect定义了切面类
public class MyAspect {
	@Pointcut("execution(* com.itheima.jdk.*.*(..))")// 定义切入点表达式
	private void myPointCut(){}/
	

	@Before("myPointCut()")// 前置通知，且指定切入点表达式
	public void myBefore(JoinPoint joinPoint) {
		System.out.print("前置通知 ：模拟执行权限检查...,");
		System.out.print("目标类是："+joinPoint.getTarget() );  //返回目标对象（即返回目标对象的Bean值）。
		System.out.println(",被织入增强处理的目标方法为："+joinPoint.getSignature().getName());  
	}


	// 后置通知
	@AfterReturning(value="myPointCut()")
	public void myAfterReturning(JoinPoint joinPoint) {
		System.out.print("后置通知：模拟记录日志...," );
		System.out.println("被织入增强处理的目标方法为："+ joinPoint.getSignature().getName());
	}


	// 环绕通知：
	@Around("myPointCut()")
	public Object myAround(ProceedingJoinPoint proceedingJoinPoint) 
            throws Throwable {
		// 开始：执行addUser()与其他通知后前，执行
		System.out.println("环绕开始：执行目标方法之前，模拟开启事务...");
		Object obj = proceedingJoinPoint.proceed();
		// 结束：执行完addUser()，执行
		System.out.println("环绕结束：执行目标方法之后，模拟关闭事务...");
		return obj;
	}


	// 异常通知：
	@AfterThrowing(value="myPointCut()",throwing="e")
	public void myAfterThrowing(JoinPoint joinPoint, Throwable e) {
		System.out.println("异常通知：" + "出错了" + e.getMessage());
	}


	// 最终通知
	@After("myPointCut()")
	public void myAfter() {
		System.out.println("最终通知：模拟方法结束后的释放资源...");
	}
}

<?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-4.3.xsd
  http://www.springframework.org/schema/aop 
  http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
  http://www.springframework.org/schema/context 
  http://www.springframework.org/schema/context/spring-context-4.3.xsd">
      <!-- 指定需要扫描的包，使注解生效 -->
      <context:component-scan base-package="com.itheima" />

      <!-- 启动基于注解的声明式AspectJ支持 -->
      <aop:aspectj-autoproxy />
</beans>


--
--测试器
package com.itheima.aspectj.annotation;
import org.springframework.context.ApplicationContext;
import 
    org.springframework.context.support.ClassPathXmlApplicationContext;
import com.itheima.jdk.UserDao;
// 测试类
public class TestAnnotationAspectj {
	public static void main(String args[]) {
		String xmlPath = 
                  "com/itheima/aspectj/annotation/applicationContext.xml";
		ApplicationContext applicationContext = 
                 new ClassPathXmlApplicationContext(xmlPath);
		// 1 从spring容器获得内容
		UserDao userDao = (UserDao) applicationContext.getBean("userDao");
		// 2 执行方法时刻：则会产方法功能增强效果
		userDao.addUser();
	}
}