spring的aop实现

Spring默认AspectJ切入点语法

引入:将方法或字段添加到被处理的类中。
目标对象: 包含连接点的对象。也被称作 被通知或被代理对象。 
AOP代理：AOP框架创建的对象，对目标对象的加强。
织入：将增强处理添加到目标对象中，并创建一个被增强的对象的过程。

扫描加的注释和启动@Aspect所需要的jar包：

为了在Spring配置中使用@AspectJ切面，首先必须启用Spring对@AspectJ切面配置的支持，并确保自动代理（autoproxying）的bean是否能被这些切面通知。自动代理是指Spring会判断一个bean是否使用了一个或多个切面通知，并据此自动生成相应的代理以拦截其方法调用，并且确保通知在需要时执行。

通过在Spring的配置中引入下列元素来启用Spring对@AspectJ的支持：

<aop:aspectj-autoproxy/>

配置文件

xmlns:context="http://www.springframework.org/schema/context"
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd

配置aop

增加验证验证文档
xmlns:aop="http://www.springframework.org/schema/aop"
http://www.springframework.org/schema/aop 
http://www.springframework.org/schema/aop /spring-aop-4.0.xsd

package net.csdn.www.dao;

import org.springframework.stereotype.Component;

@Component
public class UserDao {
    public void save(){
    	System.out.println("用户保存成功！");
    }
}

<?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"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
	http://www.springframework.org/schema/aop 
	http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
	http://www.springframework.org/schema/context
	http://www.springframework.org/schema/context/spring-context-4.0.xsd"
	>
	<!-- 语言写入值xmlns:p -->
	<!-- xmlns:context扫描加的注释 -->
	<context:component-scan base-package="net.csdn.www.dao,net.csdn.www.aop">
	
	<!-- 启动@Aspect支持 -->
	<context:include-filter type="annotation"
			expression="org.aspectj.lang.annotation.Aspect"/>
	</context:component-scan>
    <aop:aspectj-autoproxy/>
</beans>

package net.csdn.www.aop;

import java.util.logging.Level;
import java.util.logging.Logger;

import org.aspectj.lang.ProceedingJoinPoint;
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;

//定义成一个切面
@Aspect
public class LogAspect {
	//定义一个切入点    ,访问修饰符，包名，类名，方法名（参数，异常）
	@Before("execution(* net.csdn.www.dao.*.save*(..))")
	public void saveLog() {
		Logger log = Logger.getLogger(LogAspect.class.getName());
		log.log(Level.INFO, "信息被保存");

	}	
}

ApplicationContext context=new  ClassPathXmlApplicationContext("applicationContext.xml");
		UserDao userDao=(UserDao) context.getBean("userDao");
		userDao.save();

在UserDao.java中声明一个方法：

   public void delete(){
    	int i= 5/0;
    }

@AfterThrowing(throwing="rvt",pointcut="execution(* net.csdn.www.dao.*.delete*(..))")
	public void throwLog(Throwable rvt){
	      System.out.println("获取目标方法抛出的异常"+rvt);
	      System.out.println("记录日志");
	}	

Exception in thread "main" java.lang.ArithmeticException: / by zero
at net.csdn.www.dao.UserDao.delete(UserDao.java:15)
at net.csdn.www.dao.UserDao$$FastClassBySpringCGLIB$$c34aca31.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:711)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.aop.aspectj.AspectJAfterThrowingAdvice.invoke(AspectJAfterThrowingAdvice.java:58)获取目标方法抛出的异常java.lang.ArithmeticException: / by zero
记录日志


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.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:644)
at net.csdn.www.dao.UserDao$$EnhancerBySpringCGLIB$$d3fba046.delete(<generated>)
at net.csdn.www.test.Test.main(Test.java:14)

添加UserDao.java带返回值的方法

  public String selectUser(String name){
    	System.out.println("用户信息查询成功");
    	return "success";
    }

	//定义一个Around的切入点
	@Around("execution(* net.csdn.www.dao.*.select*(..))")
	public Object selectLog(ProceedingJoinPoint pj) throws Throwable{
		Logger log = Logger.getLogger(LogAspect.class.getName());
		log.log(Level.INFO, "信息被查询");
		//System.out.println(pj.getArgs()+"--");
		Object result= pj.proceed(new String[]{"peitihuande zhi"});
		return "peitihuande zhi";
	}

信息: JSR-330 ‘javax.inject.Inject‘ annotation found and supported for autowiring
2014-3-27 22:28:00 net.csdn.www.aop.LogAspect selectLog
信息: 信息被查询
用户信息查询成功
peitihuande zhi

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