spring aop五种通知及通知中传递参数!

分手后的思念是犯贱 2022-07-14 09:30 235阅读 0赞

定义切面(包含五种通知):

import org.aspectj.lang.ProceedingJoinPoint;
    
    public class MyXmlServiceAop {
    
        public void beforeHandler(String name, int age) {
            System.out.println("前置通知:" + name + ":age=" + age);
        }
    
        public void aroundHandler(ProceedingJoinPoint jointPoint) {
            try {
                System.out.println("环绕通知开始");
                String name = (String) jointPoint.proceed();
                jointPoint.proceed();
                System.out.println(name + "环绕通知结束");
            } catch (Throwable e) {
                
            }
        }
    
        public void afterHandler() {
            System.out.println("后置通知");
        }
        
        public void returnHandler(Object name) { //在返回通知中获取返回值
            System.out.println("返回通知:" + name);
        }
    
        public void throwExceptionHandler(Throwable ex) {
            System.out.println("异常通知:" + ex.getMessage());
        }
    }

定义service及切点方法:

public interface MyXmlService {
        
        String handlerXml(String name, int age);
    }

public class MyXmlServiceImpl implements MyXmlService {
    
        public String handlerXml(String name, int age) {
            //int a = 1 / 0; //异常通知模拟
            System.out.println(name + ":xml处理类!");
            return name;
        }
    
        
    }

application-context.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" xmlns:tx="http://www.springframework.org/schema/tx"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx.xsd">
        
        <bean id="serviceAop" class="com.tanlei.service.MyXmlServiceAop"></bean>
        
        <aop:config>
            <aop:aspect ref="serviceAop">
                <aop:pointcut expression="execution(* com.tanlei.service.MyXmlService.handlerXml(..)) and args(name,age)" id="handlerXml"/> 
                <aop:pointcut expression="execution(* com.tanlei.service.MyXmlService.handlerXml(..))" id="handlerXml2"/> 
                <aop:before method="beforeHandler" pointcut-ref="handlerXml" arg-names="name,age" /> 
                <aop:around method="aroundHandler" pointcut-ref="handlerXml2"/> 
                <aop:after method="afterHandler" pointcut-ref="handlerXml2"/>  
                <aop:after-returning method="returnHandler" pointcut-ref="handlerXml2" returning="name"/> 
                 <aop:after-throwing method="throwExceptionHandler" throwing="ex" pointcut-ref="handlerXml2"/> 
            </aop:aspect>
        </aop:config>
        
        <bean id="myXmlService" class="com.tanlei.service.MyXmlServiceImpl"></bean>
    </beans>

main测试类:

public class Main {
        
        public static void main(String[] args) {
            ApplicationContext context = new ClassPathXmlApplicationContext("application-context.xml");
            MyXmlService service = (MyXmlService) context.getBean("myXmlService");
            String name = service.handlerXml("t6", 25);
            System.out.println(name);
        }
    }

值得注意的是，当使用环绕通知后，返回通知和方法返回值中是获取不到切点方法的返回值的，因为在环绕通知中已调用切点方法。