Spring框架AOP面向切面编程原理全面分析

< dependency >

       < groupId >org.springframework</ groupId >

       < artifactId >spring-aop</ artifactId >

       < version >5.3.9</ version >

     </ dependency >

     < dependency >

       < groupId >org.springframework</ groupId >

       < artifactId >spring-aspects</ artifactId >

       < version >5.3.9</ version >

     </ dependency >

     < dependency >

       < groupId >org.springframework</ groupId >

       < artifactId >spring-context</ artifactId >

       < version >5.3.9</ version >

     </ dependency >

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

import java.util.Arrays;

public class MyInvocationHandler implements InvocationHandler {

     private Object object= null ;

     public Object bind(Object object){

         this .object=object;

         return Proxy.newProxyInstance(object.getClass().getClassLoader(),object.getClass().getInterfaces(), this );

     }

     @Override

     public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {

         System.out.println(method.getName()+ "方法的参数" + Arrays.toString(args));

         Object result=method.invoke( this .object,args);

         System.out.println(method.getName()+ "的结果是" +result);

         return result;

     }

}

import org.aspectj.lang.JoinPoint;

import org.aspectj.lang.annotation.After;

import org.aspectj.lang.annotation.AfterReturning;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Before;

import org.springframework.stereotype.Component;

import java.util.Arrays;

@Aspect

@Component

public class LoggerAspect {

     //@before表适方法执行的具体位置和时机

     @Before ( "execution(public int Util.impl.Calimpl.*(..))" )

     public void before(JoinPoint joinPoint){

         //获取方法名

         String name=joinPoint.getSignature().getName();

         //获取参数

         String args= Arrays.toString(joinPoint.getArgs());

         System.out.println(name+ "方法的参数是" +args);

     }

     @After ( "execution(public int Util.impl.Calimpl.*(..))" )

     public   void after(JoinPoint joinPoint){

         String name=joinPoint.getSignature().getName();

         System.out.println(name+ "执行完毕" );

     }

     @AfterReturning (value = "execution(public int Util.impl.Calimpl.*(..))" ,returning = "result" )

     public void returning(JoinPoint joinPoint,Object result){

         System.out.println( "结果是:" +result);

     }

}

import Util.Cal;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test2 {

     public static void main(String[] args) {

         ApplicationContext applicationContext= new ClassPathXmlApplicationContext( "spring-aop.xml" );

         Cal proxy = (Cal) applicationContext.getBean( "calimpl" );

         proxy.add( 1 , 1 );

     }

}

<? xml version = "1.0" encoding = "UTF-8" ?>

< beans xmlns = "http://HdhCmsTestspringframework.org/schema/beans"

        xmlns:xsi = "http://HdhCmsTestw3.org/2001/XMLSchema-instance"

        xmlns:context = "http://HdhCmsTestspringframework.org/schema/context"

        xmlns:aop = "http://HdhCmsTestspringframework.org/schema/aop"

        xmlns:p = "http://HdhCmsTestspringframework.org/schema/p"

        xsi:schemaLocation="http://HdhCmsTestspringframework.org/schema/aop

http://HdhCmsTestspringframework.org/schema/aop/spring-aop-4.3.xsd

  http://HdhCmsTestspringframework.org/schema/beans

http://HdhCmsTestspringframework.org/schema/beans/spring-beans-4.3.xsd

  http://HdhCmsTestspringframework.org/schema/context

http://HdhCmsTestspringframework.org/schema/context/spring-context-4.3.xsd

">

     <!-- ?动扫描 -->

     < context:component-scan base-package = "Util" >

     </ context:component-scan >

     <!-- 是Aspect注解?效，为?标类?动?成代理对象 -->

     < aop:aspectj-autoproxy ></ aop:aspectj-autoproxy >

</ beans >