spring AOP实例

一个简单的AOP实例

全例以注解形式完成spring配置

1.创建了一个业务接口

BuyBook.javapackage aop;

public interface BuyBook {
public String buyBook(String customer , String book);
}

2.实现接口

BuyBookImpl.java

package aop;

import org.springframework.stereotype.Service;
@Service
public class BuyBookImpl implements BuyBook {
public String buyBook(String customer, String book) {
System.out.println("customer:"+customer+","+"book:"+book);
return "Hello World!";
}
}


3.创建切面类

MoocAspect.java

package aop;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
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;

@Component
@Aspect
public class MoocAspect {

@Pointcut("execution(* aop.BuyBookImpl.*(..))")
public void pointcut(){}

//传入参数customer和book,参数需与aspect类方法参数相同
@Before("pointcut() && args(customer,book)")
public void before(String customer,String book){
System.out.println("Before"+book);
}

@After("pointcut()")
public void after(){
System.out.println("After");
}

@Around("pointcut()")
public Object aroundAspect(ProceedingJoinPoint pjp) throws Throwable{
System.out.println("around 1");
Object obj = pjp.proceed();
System.out.println("around 2");
System.out.println("around"+obj);
return obj;
}

@AfterReturning(pointcut="pointcut()",returning="returnValue")
public void afterReturning(Object returnValue){
System.out.println("AfterReturning:"+returnValue);
}

}


4.创建测试类

TestBuyBook.java

package aop;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestBuyBook {
@Test
public void testBuyBook(){
String location = "applicationContext.xml";
ApplicationContext ctx = new ClassPathXmlApplicationContext(location);
BuyBook b = (BuyBook) ctx.getBean("buyBookImpl");
b.buyBook("小东", "《楚留香》");

}
}


5.spring配置xml
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:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:component-scan base-package="aop"></context:component-scan>
<aop:aspectj-autoproxy></aop:aspectj-autoproxy>

</beans>

执行结果：
Before《楚留香》

around 1

customer:小东,book:《楚留香》

After

AfterReturning:Hello World!

around 2

aroundHello World!