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)