Spring AOP 基于xml的方式增加五种通知

小编用的IDE是IntelliJ2017，用maven管理项目

 

1.maven仓库依赖

<!-- Spring需要 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>4.3.9.RELEASE</version>
    </dependency>

    <!-- Spring需要 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>4.3.7.RELEASE</version>
    </dependency>

    <!-- aspectj 的jar-->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjrt</artifactId>
      <version>1.8.9</version>
    </dependency>

    <!-- aspectj 的jar-->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjtools</artifactId>
      <version>1.8.9</version>
    </dependency>

    <!-- aspectj 的jar-->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.7.4</version>
    </dependency>

    <!-- aop需要的jar-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>4.3.9.RELEASE</version>
    </dependency>

2.创建了接口类

package aop.impl;

public interface AtithmeticCalculator {

    int add(int i, int j);
    int sub(int i, int j);
    int mul(int i, int j);
    int div(int i, int j);
}

3.接口的实现类

package aop.impl;

import org.springframework.stereotype.Component;

/*@Component*/
public class AtithmeticCalculatorImpl implements AtithmeticCalculator {
    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;
    }
}

4.创建实现切面的类

package aop.impl;

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;

class LoggingAspect {

    public void beforeMethod(JoinPoint joinPoint) {
        //获取当前执行的方法名
        String methodName = joinPoint.getSignature().getName();
        //获取当前运行的对象
        List<Object> args = Arrays.asList(joinPoint.getArgs());
        System.out.println("前置通知：The method" + methodName + " begins with " + args);
    }


    public void afterMethod(JoinPoint joinPoint) {
        //获取当前执行的方法名
        String methodName = joinPoint.getSignature().getName();
        System.out.println("后置通知：The method " + methodName + " ends");
    }

    public void afterReturning(JoinPoint joinPoint, Object result) {
        String methodName = joinPoint.getSignature().getName();
        System.out.println("返回通知：The method " + methodName + " ends with " + result);

    }


    public void afterThrowing(JoinPoint joinPoint, Exception ex) {
        String methodName = joinPoint.getSignature().getName();
        System.out.println("异常通知：The method " + methodName + " occurs exception: " + ex);
    }

  
    public Object aroundMethod(ProceedingJoinPoint pjd) {
        Object result = null;
        String methodName = pjd.getSignature().getName();
        //执行目标方法
        try {
            //前置通知
            System.out.println("环绕通知(前置)：The method " + methodName + " begins with " + Arrays.asList(pjd.getArgs()));
            result = pjd.proceed();
            //后置通知
            System.out.println("环绕通知(后置)The method ends with "+result);
        } catch (Throwable e) {
            e.printStackTrace();
            System.out.println("环绕通知(异常)The method ocuurs exception: " + e );
            throw new RuntimeException(e);
        }
        System.out.println("环绕通知(后置) The method ends");
        return result;
    }
}

5.配置Bean

<?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">

    <!--配置Bean-->
    <bean id="atithmeticCalculator" class="aop.impl.AtithmeticCalculatorImpl"></bean>
      <!--配置切面的bean-->
    <bean id="loggingAspect" class="aop.impl.LoggingAspect"/>

    <!--配置AOP-->
    <aop:config>
        <!--配置切点表达式-->
        <aop:pointcut id="pointcut" expression="execution(public int aop.impl.AtithmeticCalculator.*(int,int))"/>
        <!--配置切面及通知-->
        <aop:aspect ref="loggingAspect" >
            <aop:before method="beforeMethod" pointcut-ref="pointcut"/>
            <aop:after method="afterMethod" pointcut-ref="pointcut"/>
            <aop:after-throwing method="afterThrowing" pointcut-ref="pointcut" throwing="ex"/>
            <aop:after-returning method="afterReturning" pointcut-ref="pointcut" returning="result"/>
            <!--<aop:around method="aroundMethod" pointcut-ref="pointcut"/>-->
        </aop:aspect>
    </aop:config>
</beans>

6.测试类

package aop.impl;

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

public class Main {
   public static  void main(String args[]){
       //1.创建Spring的IOC容器
       ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext-xml.xml");
       //2.从IOC容器中获取Bean的实例
       AtithmeticCalculator atithmeticCalculator = context.getBean(AtithmeticCalculator.class);
       //3.使用Bean
       int result = atithmeticCalculator.add(3,6);
       System.out.println("result:"+result);

       result = atithmeticCalculator.mul(9,8);
       System.out.println("result："+result);

       result  = atithmeticCalculator.div(5,0);
       System.out.println(result);
   }
}