spring学习随笔4

本文主要是spring的除ioc以外的另外一个特色aop的使用方式

本篇配置是基于注解的

 

配置文件aop.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns="http://www.springframework.org/schema/beans"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:tx="http://www.springframework.org/schema/tx"    xmlns:aop="http://www.springframework.org/schema/aop"xmlns:util="http://www.springframework.org/schema/util"xmlns:p="http://www.springframework.org/schema/p"     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-4.2.xsd      http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.2.xsdhttp://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.0.xsd    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd      http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd">  <context:component-scan base-package="com.liu.aop" /> <aop:aspectj-autoproxy></aop:aspectj-autoproxy> </beans>

ICalculator.java

package com.liu.aop;public interface ICalculator {public int add(int i,int j);public int minus(int i,int j);public int div(int i,int j);}

Calculator.java

package com.liu.aop;import org.springframework.stereotype.Component;@Componentpublic class Calculator implements ICalculator {@Overridepublic int add(int i, int j) {return i + j;}@Overridepublic int minus(int i, int j) {return i - j;}@Overridepublic int div(int i, int j) {return i/j;}}

CalculatorAspect.java

package com.liu.aop;import java.util.Arrays;import java.util.List;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.AfterReturning;import org.aspectj.lang.annotation.AfterThrowing;import org.aspectj.lang.annotation.Around;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;//优先级@Order(2)//切面声明@Aspect@Componentpublic class CalculatorAspect {//切入点表达式@Pointcut(value="execution(public int com.liu.aop.ICalculator.add(.. ))")public void declareAddMethod(){}//前置通知@Before(value="declareAddMethod()")public void beforeMethod(JoinPoint joinPoint){String methodName = joinPoint.getSignature().getName();List<Object> args = Arrays.asList(joinPoint.getArgs());System.out.println("The method "+ methodName+ " begin with"+args);}//后置通知@After(value="declareAddMethod()")public void afterMethod(JoinPoint joinPoint){String methodName = joinPoint.getSignature().getName();System.out.println("The method "+ methodName+ " end ");}//返回通知@AfterReturning(value="declareAddMethod()",returning="result")public void afterReturn(JoinPoint joinPoint,Object result){String methodName = joinPoint.getSignature().getName();System.out.println("The method "+ methodName+ " return with " + result);}//异常通知@AfterThrowing(value="execution(public int com.liu.aop.ICalculator.div(.. ))",throwing="e")public void afterThrow(JoinPoint joinPoint,Exception e){String methodName = joinPoint.getSignature().getName();System.out.println("The method "+ methodName+ " occurs with " + e);}//环绕通知@Around(value="execution(public int com.liu.aop.ICalculator.minus(.. ))")public Object aroundMethod(ProceedingJoinPoint pjoinPoint){Object result = null;String methodName = pjoinPoint.getSignature().getName();List<Object> args = Arrays.asList(pjoinPoint.getArgs());System.out.println("The method "+ methodName+ " begin with"+args);try {result = pjoinPoint.proceed();} catch (Throwable e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println("The method "+ methodName+ " return with "+result);return result;}}

ValidateAspect.java

package com.liu.aop;import java.util.Arrays;import java.util.List;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;//优先级@Order(1)//切面声明@Aspect@Componentpublic class ValidateAspect {//前置通知@Before(value="CalculatorAspect.declareAddMethod()")public void beforeMethod(JoinPoint joinPoint){System.out.println("The method validate");}}

Test.java

package com.liu.aop;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Test {public static void main(String[] args) {ApplicationContext cxt = new ClassPathXmlApplicationContext("aop.xml");ICalculator calculator = (ICalculator)cxt.getBean("calculator");calculator.add(1, 3);calculator.minus(1, 3);calculator.div(1, 0);}}