初学AOP

src\dayday\Count.java

package dayday;

import org.springframework.stereotype.Component;

/** * Created by I am master on 2016/12/3. */@Componentpublic interface Count {   int add(int i, int j);   int mul(int i, int j);   int div(int i, int j);   int sub(int i, int j);}

src\dayday\CountImpl.java

package dayday;

import dayday.Count;import org.springframework.stereotype.Component;

/** * Created by I am master on 2016/12/3. */@Componentpublic class CountImpl implements Count {    public int add(int i,int j){        int result=i+j;        return result;    }    public int sub(int i,int j){        int result=i-j;        return result;    }    public int mul(int i,int j){        int result=i*j;        return result;    }    public int div(int i,int j){        int result=i/j;        return result;    }}

src\dayday\LogginAspect.java

package dayday;

import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.*;

import org.springframework.stereotype.Component;

import java.util.Arrays;import java.util.List;

/** * Created by I am master on 2016/12/3. */@Aspect@Componentpublic class LogginAspect {    @Before("execution(public int dayday.Count.add(int,int))")    public  void beforeMethod(JoinPoint joinpoint){        String methodName=joinpoint.getSignature().getName();        List<Object>args= Arrays.asList(joinpoint.getArgs());        System.out.println("method is "+methodName+" begins with "+args);    }    @After("execution(public int dayday.Count.add(int,int))")    public void afterMethod(){        System.out.println("After...");    }    @AfterReturning(value="execution(public int dayday.Count.add(int,int))",returning = "result")    public void afterReturning(JoinPoint joinpoint,Object result){         String methodName=joinpoint.getSignature().getName();         System.out.println("method is "+methodName+" result is "+result);    }    @AfterThrowing(value="execution(public int dayday.Count.div(int,int))",throwing ="exception")    public void afterThrowing(JoinPoint joinpoint,Exception exception){        String methodName=joinpoint.getSignature().getName();        System.out.println("method is "+methodName+" occurs "+exception);    }    @Around("execution(public int dayday.Count.add(int,int))")    public Object aroundMethod(ProceedingJoinPoint pjd){

Object result = null;        String methodName = pjd.getSignature().getName();

try {            //前置通知            System.out.println("The method " + methodName + " begins with " + Arrays.asList(pjd.getArgs()));            //执行目标方法            result = pjd.proceed();            //返回通知            System.out.println("The method " + methodName + " ends with " + result);        } catch (Throwable e) {            //异常通知            System.out.println("The method " + methodName + " occurs exception:" + e);            throw new RuntimeException(e);        }        //后置通知        System.out.println("The method " + methodName + " ends");        return result;    }}

src\dayday\Main.java

package dayday;

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

/** * Created by I am master on 2016/12/3. */public class Main {    public static void main(String[] args){        ApplicationContext ctx=new ClassPathXmlApplicationContext("beans.xml");        Count c = ctx.getBean(Count.class);        int result=c.add(8,3);    }}

src\beans.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"       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">       <context:component-scan base-package="dayday"/>       <!--使AspectJ注释起作用，自动为匹配的类生成代理对象-->       <aop:aspectj-autoproxy/></beans>