spring-3 1. Xml<!-- \src\applicationContext-xml.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:aop="http://www.springframework.org/schema/aop"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd"><!-- 配置 bean --><bean id="arithmeticCalculator" class="com.atguigu.spring.aop.xml.ArithmeticCalculatorImpl"></bean><!-- 配置切面的 bean. --><bean id="loggingAspect"class="com.atguigu.spring.aop.xml.LoggingAspect"></bean><bean id="vlidationAspect"class="com.atguigu.spring.aop.xml.VlidationAspect"></bean><!-- 配置 AOP --><aop:config><!-- 配置切点表达式 --><aop:pointcut expression="execution(* com.atguigu.spring.aop.xml.ArithmeticCalculator.*(int, int))" id="pointcut"/><!-- 配置切面及通知 --><aop:aspect ref="loggingAspect" order="2"><aop:before method="beforeMethod" pointcut-ref="pointcut"/><aop:after method="afterMethod" pointcut-ref="pointcut"/><aop:after-throwing method="afterThrowing" pointcut-ref="pointcut" throwing="e"/><aop:after-returning method="afterReturning" pointcut-ref="pointcut" returning="result"/><!-- <aop:around method="aroundMethod" pointcut-ref="pointcut"/>--></aop:aspect> <aop:aspect ref="vlidationAspect" order="1"><aop:before method="validateArgs" pointcut-ref="pointcut"/></aop:aspect></aop:config></beans><!-- \src\applicationContext.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/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsdhttp://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"><!-- 配置自动扫描的包 --><context:component-scan base-package="com.atguigu.spring.aop"></context:component-scan><!-- 配置自动为匹配 aspectJ 注解的 Java 类生成代理对象 --><aop:aspectj-autoproxy></aop:aspectj-autoproxy></beans>
2. Java// \src\com\atguigu\spring\aop\ArithmeticCalculator.java package com.atguigu.spring.aop;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);}// \src\com\atguigu\spring\aop\ArithmeticCalculatorImpl.java package com.atguigu.spring.aop;import org.springframework.stereotype.Component;@Component("arithmeticCalculator") public class ArithmeticCalculatorImpl implements ArithmeticCalculator {@Overridepublic int add(int i, int j) {int result = i + j;return result;}@Overridepublic int sub(int i, int j) {int result = i - j;return result;}@Overridepublic int mul(int i, int j) {int result = i * j;return result;}@Overridepublic int div(int i, int j) {int result = i / j;return result;}}// \src\com\atguigu\spring\aop\LoggingAspect.java package com.atguigu.spring.aop;import java.util.Arrays;import org.aspectj.lang.JoinPoint; import org.aspectj.lang.annotation.After; import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.AfterThrowing; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.springframework.core.annotation.Order; import org.springframework.stereotype.Component;/*** 可以使用 @Order 注解指定切面的优先级, 值越小优先级越高*/ @Order(2) @Aspect @Component public class LoggingAspect {/*** 定义一个方法, 用于声明切入点表达式. 一般地, 该方法中再不需要添入其他的代码. * 使用 @Pointcut 来声明切入点表达式. * 后面的其他通知直接使用方法名来引用当前的切入点表达式. */@Pointcut("execution(public int com.atguigu.spring.aop.ArithmeticCalculator.*(..))")public void declareJointPointExpression(){}/*** 在 com.atguigu.spring.aop.ArithmeticCalculator 接口的每一个实现类的每一个方法开始之前执行一段代码*/@Before("declareJointPointExpression()")public void beforeMethod(JoinPoint joinPoint){String methodName = joinPoint.getSignature().getName();Object [] args = joinPoint.getArgs();System.out.println("The method " + methodName + " begins with " + Arrays.asList(args));}/*** 在方法执行之后执行的代码. 无论该方法是否出现异常*/@After("declareJointPointExpression()")public void afterMethod(JoinPoint joinPoint){String methodName = joinPoint.getSignature().getName();System.out.println("The method " + methodName + " ends");}/*** 在方法法正常结束受执行的代码* 返回通知是可以访问到方法的返回值的!*/@AfterReturning(value="declareJointPointExpression()",returning="result")public void afterReturning(JoinPoint joinPoint, Object result){String methodName = joinPoint.getSignature().getName();System.out.println("The method " + methodName + " ends with " + result);}/*** 在目标方法出现异常时会执行的代码.* 可以访问到异常对象; 且可以指定在出现特定异常时在执行通知代码*/@AfterThrowing(value="declareJointPointExpression()",throwing="e")public void afterThrowing(JoinPoint joinPoint, Exception e){String methodName = joinPoint.getSignature().getName();System.out.println("The method " + methodName + " occurs excetion:" + e);}/*** 环绕通知需要携带 ProceedingJoinPoint 类型的参数. * 环绕通知类似于动态代理的全过程: ProceedingJoinPoint 类型的参数可以决定是否执行目标方法.* 且环绕通知必须有返回值, 返回值即为目标方法的返回值*//*@Around("execution(public int com.atguigu.spring.aop.ArithmeticCalculator.*(..))")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\com\atguigu\spring\aop\Main.java package com.atguigu.spring.aop;import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main {public static void main(String[] args) {ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");ArithmeticCalculator arithmeticCalculator = (ArithmeticCalculator) ctx.getBean("arithmeticCalculator");System.out.println(arithmeticCalculator.getClass().getName());int result = arithmeticCalculator.add(1, 2);System.out.println("result:" + result);result = arithmeticCalculator.div(1000, 10);System.out.println("result:" + result);}}// \src\com\atguigu\spring\aop\VlidationAspect.java package com.atguigu.spring.aop;import java.util.Arrays;import org.aspectj.lang.JoinPoint; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.springframework.core.annotation.Order; import org.springframework.stereotype.Component;@Order(1) @Aspect @Component public class VlidationAspect {@Before("com.atguigu.spring.aop.LoggingAspect.declareJointPointExpression()")public void validateArgs(JoinPoint joinPoint){System.out.println("-->validate:" + Arrays.asList(joinPoint.getArgs()));}}// \src\com\atguigu\spring\aop\xml\ArithmeticCalculator.java package com.atguigu.spring.aop.xml;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);}// \src\com\atguigu\spring\aop\xml\ArithmeticCalculatorImpl.java package com.atguigu.spring.aop.xml;public class ArithmeticCalculatorImpl implements ArithmeticCalculator {@Overridepublic int add(int i, int j) {int result = i + j;return result;}@Overridepublic int sub(int i, int j) {int result = i - j;return result;}@Overridepublic int mul(int i, int j) {int result = i * j;return result;}@Overridepublic int div(int i, int j) {int result = i / j;return result;}}// \src\com\atguigu\spring\aop\xml\LoggingAspect.java package com.atguigu.spring.aop.xml;import java.util.Arrays;import org.aspectj.lang.JoinPoint; import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.Around;public class LoggingAspect {public void beforeMethod(JoinPoint joinPoint){String methodName = joinPoint.getSignature().getName();Object [] args = joinPoint.getArgs();System.out.println("The method " + methodName + " begins with " + Arrays.asList(args));}public void afterMethod(JoinPoint joinPoint){String methodName = joinPoint.getSignature().getName();System.out.println("The method " + methodName + " ends");}public void afterReturning(JoinPoint joinPoint, Object result){String methodName = joinPoint.getSignature().getName();System.out.println("The method " + methodName + " ends with " + result);}public void afterThrowing(JoinPoint joinPoint, Exception e){String methodName = joinPoint.getSignature().getName();System.out.println("The method " + methodName + " occurs excetion:" + e);}@Around("execution(public int com.atguigu.spring.aop.ArithmeticCalculator.*(..))")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\com\atguigu\spring\aop\xml\Main.java package com.atguigu.spring.aop.xml;import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext;public class Main {public static void main(String[] args) {ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext-xml.xml");ArithmeticCalculator arithmeticCalculator = (ArithmeticCalculator) ctx.getBean("arithmeticCalculator");System.out.println(arithmeticCalculator.getClass().getName());int result = arithmeticCalculator.add(1, 2);System.out.println("result:" + result);result = arithmeticCalculator.div(1000, 0);System.out.println("result:" + result);}}// \src\com\atguigu\spring\aop\xml\VlidationAspect.java package com.atguigu.spring.aop.xml;import java.util.Arrays;import org.aspectj.lang.JoinPoint;public class VlidationAspect {public void validateArgs(JoinPoint joinPoint){System.out.println("-->validate:" + Arrays.asList(joinPoint.getArgs()));}}
)
