Spring AOP基于配置文件（xml）使用方法和实现

喜欢ヅ旅行 2023-06-06 10:49 1阅读 0赞

1、AOP main方法

public static void main(String[] args) {
            //1、创建Spring的容器
            ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContextXml.xml");
            //2、从IOC容器中获取bean的实例
            AopUserService aopUserService = ctx.getBean(AopUserService.class);
            //3、使用bean
            int result = aopUserService.add(3, 8);
            System.out.println("result:"+result);
    
            result = aopUserService.mul(13, 8);
            System.out.println("result:"+result);
    
            result = aopUserService.sub(3, 8);
            System.out.println("result:"+result);
    
            result = aopUserService.div(32, 4);
            System.out.println("result:"+result);
    
    
        }

2、写一个接口

public interface AopUserService {
        public int add(int x, int y);
        public int mul(int x, int y);
        public int sub(int x, int y);
        public int div(int x, int y);
    }

3、实现接口的方法

public class AopUserServiceImpl implements AopUserService {
        @Override
        public int add(int x, int y) {
            int result = x + y;
            return result;
        }
        @Override
        public int mul(int x, int y) {
            int result = x - y;
            return result;
        }
        @Override
        public int sub(int x, int y) {
            int result = x * y;
            return result;
        }
        @Override
        public int div(int x, int y) {
            int result = x / y;
            return result;
        }
    }

4、定一个类，开始AOP

public class UserAspect {
        /**
         * 声明该方法是一个前置方法，在目标方法开始之前执行
         * @param joinPoint
         */
        public void beforeMethod(JoinPoint joinPoint) {
            String name = joinPoint.getSignature().getName();
            List<Object> args = Arrays.asList(joinPoint.getArgs());
            System.out.println("1、--->the method " + name + " begins" + args);
        }
        /**
         * 后置通知是在连接点完成之后执行，即连接点返回结果或都抛出异常的时候，下面的后置通知记录了方法终止，
         * 一个切面可以包含一个或多个通知，在后置通知中不能访问目标方法的执行结果
         * @param joinPoint
         */
        public void afterMethod(JoinPoint joinPoint) {
            String name = joinPoint.getSignature().getName();
            List<Object> args = Arrays.asList(joinPoint.getArgs());
            System.out.println("the method " + name + " end: ");
        }
        /**
         * 返回通知
         * @param joinPoint
         * @param result
         */
        public void afterReturning(JoinPoint joinPoint, Object result) {
            String name = joinPoint.getSignature().getName();
            List<Object> args = Arrays.asList(joinPoint.getArgs());
            System.out.println("the method " + name + " end: " + result);
        }
        /**
         * 异常通知
         * @param joinPoint
         * @param ex
         */
        public void AfterThrowing(JoinPoint joinPoint,Exception ex){
            String name = joinPoint.getSignature().getName();
            System.out.println("the method " + name + " exction: " + ex);
        }
    }

5、定义另一个类，验证AOP

public class ValiidateAspect {
        /**
         * 引入外部切入点表达式，类名加方法，如果不在同一包下，还需要加上包名
         * @param joinPoint
         */
        public void validate(JoinPoint joinPoint){
            System.out.println("2、------>validate:"+ Arrays.asList(joinPoint.getArgs()));
        }
    }

6、配置xml文件

<?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-4.2.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">
        
        <bean id="aopUserService" class="main.cn.com.fullstackxml.services.impl.AopUserServiceImpl"></bean>
    
        
        <bean id="userAspect" class="main.cn.com.fullstackxml.aop.UserAspect"></bean>
        <bean id="valiidateAspect" class="main.cn.com.fullstackxml.aop.ValiidateAspect"></bean>
    
        
        <aop:config>
            
            <aop:pointcut id="pointcut" expression="execution(* main.cn.com.fullstackxml.services.AopUserService.*(int,int))"></aop:pointcut>
            
            <aop:aspect ref="userAspect" order="1">
                <aop:before method="beforeMethod" pointcut-ref="pointcut"></aop:before>
                <aop:after method="afterMethod" pointcut-ref="pointcut"></aop:after>
                <aop:after-returning method="afterReturning" pointcut-ref="pointcut" returning="result"></aop:after-returning>
                <aop:after-throwing method="AfterThrowing" pointcut-ref="pointcut" throwing="ex"></aop:after-throwing>
            </aop:aspect>
            <aop:aspect ref="valiidateAspect" order="2">
                <aop:before method="validate" pointcut-ref="pointcut"></aop:before>
            </aop:aspect>
        </aop:config>
    </beans>