• Spring入门第十九课


    后置通知

    看代码:

    package logan.study.aop.impl;
    
    public interface ArithmeticCalculator {
        
        int add(int i, int j);
        int sub(int i, int j);
        int mul(int i, int j);
        int div(int i, int j);
        
    
    }
    package logan.study.aop.impl;
    
    import org.springframework.stereotype.Component;
    
    @Component
    public class ArithmeticCalculatorImpl implements ArithmeticCalculator {
    
        @Override
        public int add(int i, int j) {
            // TODO Auto-generated method stub
            int result = i + j;
            return result;
        }
    
        @Override
        public int sub(int i, int j) {
            // TODO Auto-generated method stub
            int result = i - j;
            return result;
        }
    
        @Override
        public int mul(int i, int j) {
            // TODO Auto-generated method stub
            int result = i * j;
            return result;
        }
    
        @Override
        public int div(int i, int j) {
            // TODO Auto-generated method stub
            int result = i / j;
            return result;
        }
    
    }
    package logan.study.aop.impl;
    
    import java.util.Arrays;
    import java.util.List;
    
    import org.aspectj.lang.JoinPoint;
    import org.aspectj.lang.annotation.After;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Before;
    import org.springframework.stereotype.Component;
    
    //把这个类声明为一个切面:需要把该类放入到IOC容器中,在声明为一个切面
    @Aspect
    @Component
    public class LoggingAspect {
        //声明该方法时一个前置通知:在目标方法开始之前执行
        @Before("execution(public int logan.study.aop.impl.ArithmeticCalculator.*(int, int))")
        public void beforeMethod(JoinPoint joinPoint){
            String methodName = joinPoint.getSignature().getName();
            List<Object> args = Arrays.asList(joinPoint.getArgs());
            System.out.println("The method "+ methodName +" begins with "+args);
        }
        
        //后置通知,在目标方法执行之后执行(无论该方法是否出现异常)
        //在后置通知中,还不能访问目标方法执行的结果,执行结果在返回通知中可以访问
        @After("execution(public int logan.study.aop.impl.ArithmeticCalculator.*(int, int))")
        public void afterMethod(JoinPoint joinPoint){
            String methodName = joinPoint.getSignature().getName();
            List<Object> args = Arrays.asList(joinPoint.getArgs());
            System.out.println("The method "+ methodName +" ends with "+args);
        }
    
    }
    <?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"
        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-4.3.xsd
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">
    
        <context:component-scan base-package="logan.study.aop.impl"></context:component-scan>
        <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
        
    
    </beans>
    package logan.study.aop.impl;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Main {
    
        public static void main(String[] args) {
            // TODO Auto-generated method stub
            //1.创建Spring的IOC容器
            ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
            //2.从IOC容器里面获取bean实例
            ArithmeticCalculator arithmeticCalculator = ctx.getBean(ArithmeticCalculator.class);
            //使用Bean
            int result = arithmeticCalculator.add(3, 6);
            System.out.println(result);
            
            result = arithmeticCalculator.div(3, 6);
            System.out.println(result);
    
        }
    
    }

    输出结果:

    五月 27, 2017 5:46:24 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
    信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@49c2faae: startup date [Sat May 27 17:46:24 CST 2017]; root of context hierarchy
    五月 27, 2017 5:46:24 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
    信息: Loading XML bean definitions from class path resource [applicationContext.xml]
    The method add begins with [3, 6]
    The method add ends with [3, 6]
    9
    The method div begins with [3, 6]
    The method div ends with [3, 6]
    0
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  • 原文地址:https://www.cnblogs.com/LoganChen/p/6913938.html
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