Spring AOP(拦截)

切面：Aspect实际交叉功能。

连接点:JoinPoint应用程序执行过程插入面的点。可以是方法调用，异常抛出。

通知Advice切面的实现

切入点(Pintcat):定义通知应用那些连接点。

目标对象(Target):被通知对象。

代理(Proxy)：通知应用目标对象创建对象。

织入(Weaving):将切面应用到目标对象从创建对象到一个新的代理对象的过程。

cglib:产生代理对象的包。

<property name="proxyTargetClass" value="false">

value="false"l产cglib的代理对象。true：产生JDK的代理对象。

 

例子：

 

类：

 

package com.lovo.bean;public class Dog {public void bark(int a,String c){System.out.println("汪汪汪汪汪汪汪");}public int bite(){System.out.println("小杜的肉好新鲜呀......");return 100;}} 

 

 

 

package com.lovo.advice;import java.lang.reflect.Method;import org.springframework.aop.AfterReturningAdvice;import org.springframework.aop.MethodBeforeAdvice;//public class MouthAdvice implements MethodBeforeAdvice{////public void before(Method arg1, Object[] arg2, Object arg3)//throws Throwable {//// TODO Auto-generated method stub//String className = arg3.getClass().getName();//String methodName = arg1.getName();//String argMsg = "";//if(arg2 == null || arg2.length == 0){//argMsg += "没有参数";//}else{//for(int i = 0; i < arg2.length; i++){//argMsg += "第" + (i + 1) + "参数是" + arg2[i] + ";"; //}//}////System.out.println("进入" + className + "类的" + methodName + "方法，参数是：" + argMsg);//}////}public class MouthAdvice implements AfterReturningAdvice{public void afterReturning(Object returnValue, Method method,Object[] args, Object target) throws Throwable {// TODO Auto-generated method stubString className = target.getClass().getName();String methodName = method.getName();String msg = "退出" + className + "类的" + methodName + "方法，返回值是：";if(returnValue == null){if(method.getReturnType().equals(void.class)){msg += "void";}else{msg += "null";}}else{msg += returnValue;}System.out.println(msg);}}

 

 

package com.lovo.test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.lovo.bean.Dog;public class TestMain {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubApplicationContext contxt = new ClassPathXmlApplicationContext("applicationContext.xml");Dog dog = (Dog)contxt.getBean("superSnoopy");dog.bark(10,"snoopy");//连接点dog.bite();//连接点}} <?xml version="1.0" encoding="UTF-8"?><!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"><beans><!-- 面包 即目标--><bean id="snoopy" class="com.lovo.bean.Dog"></bean><!-- 牛肉 即通知--><bean id="mouthAdvice" class="com.lovo.advice.MouthAdvice"></bean><!-- 刀功 即拦截器--><bean id="mouthInterceptor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor"><property name="advice" ref="mouthAdvice"></property><!-- 切入点 --><property name="pattern" value="com.lovo.bean.Dog.*"></property></bean><!-- 汉堡 即代理对象--><bean id="superSnoopy" class="org.springframework.aop.framework.ProxyFactoryBean"><property name="interceptorNames"><list><value>mouthInterceptor</value></list></property><property name="target" ref="snoopy"></property><property name="proxyTargetClass" value="false"></property></bean></beans> 

 

applicationContext.xml