• Spring入门第二十三课


    我们看基于XML配置的方式配置AOP

    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;
    
    
    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;
    
    
    public class LoggingAspect {
        
        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);
        }
        
        
        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);
        }
        
        
        public void afterReturningMethod(JoinPoint joinPoint,Object result){
            String methodName = joinPoint.getSignature().getName();
            System.out.println("The method "+ methodName +" ends with "+result);
        }
        
        
        public void afterThrowingMethod(JoinPoint joinPoint,Exception ex){
            String methodName = joinPoint.getSignature().getName();
            System.out.println("The method "+ methodName +" occus with "+ex);
        }
    
    }
    package logan.study.aop.impl;
    
    import java.util.Arrays;
    
    import org.aspectj.lang.JoinPoint;
    import org.aspectj.lang.annotation.Before;
    public class VlidationAspect {
        @Before("LoggingAspect.declareJoinPointException()")
        public void validateArgs(JoinPoint joinPoint){
            System.out.println("validate: " + Arrays.asList(joinPoint.getArgs()));
        }
    
    }
    <?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: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/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">
    
        <bean id="arithmeticCalculator"
        class="logan.study.aop.impl.ArithmeticCalculatorImpl"></bean>
        
        <bean id="loggingAspect"
        class="logan.study.aop.impl.LoggingAspect"></bean>
        
        <bean id="vlidationAspect"
        class="logan.study.aop.impl.VlidationAspect"></bean>
        
        <aop:config>
            <aop:pointcut expression="execution(* logan.study.aop.impl.ArithmeticCalculatorImpl.*(int, int))" 
            id="pointcut"/>
            <aop:aspect ref="loggingAspect" order="2">
                <aop:before method="beforeMethod" pointcut-ref="pointcut"/>
                <aop:after method="afterMethod" pointcut-ref="pointcut"/>
                <aop:after-returning method="afterReturningMethod" pointcut-ref="pointcut" returning="result"/>
                <aop:after-throwing method="afterThrowingMethod" pointcut-ref="pointcut" throwing="ex"/>
            </aop:aspect>
            <aop:aspect ref="vlidationAspect" order="1">
                <aop:before method="validateArgs" pointcut-ref="pointcut"/>
            </aop:aspect>
        </aop:config>
    
    </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.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, 1);
            System.out.println(result);
    
        }
    
    }

    返回结果:

    五月 28, 2017 7:53:29 上午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
    信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@49c2faae: startup date [Sun May 28 07:53:29 CST 2017]; root of context hierarchy
    五月 28, 2017 7:53:29 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
    信息: Loading XML bean definitions from class path resource [applicationContext-xml.xml]
    validate: [3, 6]
    The method add begins with [3, 6]
    The method add ends with [3, 6]
    The method add ends with 9
    9
    validate: [3, 1]
    The method div begins with [3, 1]
    The method div ends with [3, 1]
    The method div ends with 3
    3

    稍微修改代码:

    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.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, 0);
            System.out.println(result);
    
        }
    
    }

    返回结果:

    五月 28, 2017 7:56:58 上午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
    信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@49c2faae: startup date [Sun May 28 07:56:58 CST 2017]; root of context hierarchy
    五月 28, 2017 7:56:58 上午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
    信息: Loading XML bean definitions from class path resource [applicationContext-xml.xml]
    validate: [3, 6]
    The method add begins with [3, 6]
    The method add ends with [3, 6]
    The method add ends with 9
    9
    validate: [3, 0]
    The method div begins with [3, 0]
    The method div ends with [3, 0]
    The method div occus with java.lang.ArithmeticException: / by zero
    Exception in thread "main" java.lang.ArithmeticException: / by zero
        at logan.study.aop.impl.ArithmeticCalculatorImpl.div(ArithmeticCalculatorImpl.java:30)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
        at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
        at org.springframework.aop.aspectj.AspectJAfterAdvice.invoke(AspectJAfterAdvice.java:47)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
        at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:52)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
        at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:62)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
        at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
        at com.sun.proxy.$Proxy2.div(Unknown Source)
        at logan.study.aop.impl.Main.main(Main.java:18)
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  • 原文地址:https://www.cnblogs.com/LoganChen/p/6914965.html
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