spring aop Annotation Configuration Code Example

In this article, we share the specific code of spring aop annotation configuration for your reference. The specific contents are as follows

Demo.java

package cn.itcast.e_annotation;


import javax.annotation.Resource;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import cn.itcast.bean.User;
import cn.itcast.service.ISUserService;
@RunWith(SpringJUnit4ClassRunner.class)// Help us create the container 
// Specify which configuration file to use when creating the container 
@ContextConfiguration("classpath:cn/itcast/e_annotation/applicationContext.xml")
public class Demo {
	/*
	 * @Test public void fun1() { //1  Create a container object  ClassPathXmlApplicationContext ac=new
	 * ClassPathXmlApplicationContext("applicationContext.xml"); //2  Ask the container for "want"  user Object 
	 * User u=(User)ac.getBean("user"); User u2=(User)ac.getBean("user");
	 * 
	 * System.out.println(u==u2); //3  Print user Object  System.out.println(u);
	 * 
	 * ac.close(); }
	 */
	@Resource(name="userServiceTarget")
	private ISUserService us;
	
	@Test
	public void fun1() {
		us.save();
	}
}

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" 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-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd ">
	<!--  Preparation: Import aop (Constraint) Namespace  -->
	<!-- 1.  Configure the target object  -->
	<bean name="userServiceTarget" class="cn.itcast.service.UserServiceImpl"></bean>
	<!-- 2.  Configure notification objects  -->
	<bean name="myAdvice" class="cn.itcast.e_annotation.MyAdvice"></bean>
	<!-- 3.  Open the use of annotations to complete the implantation  -->
	<aop:aspectj-autoproxy></aop:aspectj-autoproxy>
</beans>

MyAdvice.java

package cn.itcast.e_annotation;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

// Notification class 
@Aspect// When representing this class 1 Notification classes 
public class MyAdvice {
	// Pre-notification  - "Called before the target method runs 
	// Post notification (not called if an exception occurs)  - "Called after the target method runs 
	// Surround notification - "Called before and after the target method 
	// Exception interception notification - "If an exception occurs, a call is made to the 
	// Post notification (called regardless of exception) - "Called after the target method runs 
	@Pointcut("execution(* cn.itcast.service.*ServiceImpl.*(..))")
	public void pc() {}
	
	// Pre-notification 
	@Before("MyAdvice.pc()")// Specifies that the method is a pre-tangent point 
	public void before() {
		System.out.println(" This is a pre-notification ");
	}
	// Post notification 
	public void afterReturning() {
		System.out.println(" This is a post notification (it will not be called if an exception occurs!!) ");
	}
	// Surround notification 
	public Object around( ProceedingJoinPoint pjp) throws Throwable {
		System.out.println(" This is the part before wrapping around the notification ");
		Object procees=pjp.proceed();// Invoke the target method 
		System.out.println(" This is the part after the wrap notification ");
		return procees;
	}
	// Exception notification 
	public void afterException() {
		System.out.println(" Something happened, something unusual happened ");
	}
	// Post notification 
	public void after() {
		System.out.println(" This is a post notification (called if an exception occurs) ");
	}
}