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.xsd	http://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 {	@Override	public int add(int i, int j) {		return i + j;	}	@Override	public int minus(int i, int j) {		return i - j;	}	@Override	public 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 block			e.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);			}}