Spring AOP编程

Posted 2021-01-08 SparkQuant

AOP：面向切面编程

Spring的AOP编程，分为Schema-base和AspectJ，本篇为介绍Schema-base，

XML配置文件如下：

<?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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
       
  
   <bean id="mybefore" class="com.fd.advice.MyBeforeAdvice"></bean>
   <bean id="myafter" class="com.fd.advice.MyAfterAdvice"></bean>
   
   <aop:config>
   	<aop:pointcut expression="execution(* com.fd.test.Demo.*(..))" id="mypoint"/>
   	<aop:advisor advice-ref="mybefore" pointcut-ref="mypoint"/>
   	<aop:advisor advice-ref="myafter" pointcut-ref="mypoint"/>
   </aop:config>

   <bean id="demo" class="com.fd.test.Demo"></bean>
   
   
</beans>

　　关于AOP的配置都在<aop:config></aop:config>中， 其中<aop:pointcut expression="execution(* com.fd.test.Demo.*(..))" id="mypoint"/>定义的是切面 *是通配符

<aop:advisor advice-ref="mybefore" pointcut-ref="mypoint"/>和<aop:advisor advice-ref="myafter" pointcut-ref="mypoint"/>定义的是切面方法，其中MyBeforeAdvice和MyAfterAdvice需要

分别继承接口MethodBeforeAdvice、AfterReturnAdvice，

具体代码如下：

package com.fd.advice;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class MyBeforeAdvice implements MethodBeforeAdvice {

	@Override
	public void before(Method arg0, Object[] arg1, Object arg2) throws Throwable {
		System.out.println("Before Method Advice" + arg0);
		
	}

}

　　

package com.fd.advice;

import java.lang.reflect.Method;

import org.springframework.aop.AfterReturningAdvice;

public class MyAfterAdvice implements AfterReturningAdvice{

	@Override
	public void afterReturning(Object arg0, Method arg1, Object[] arg2, Object arg3) throws Throwable {
		System.out.println("After returning advice...");		
	}

}

　　

package com.fd.test;

public class Demo {
	public void demo1() {
		System.out.println("demo1");
	}
	public void demo2(String para) {
		System.out.println("demo2");
	}
	public void demo3() {
		System.out.println("demo3");
	}

}

　　

package com.fd.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestDemo {
	public static void main(String[] args) {
		ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
		Demo demo = ac.getBean("demo", Demo.class);
		demo.demo1();
		demo.demo2("aad");
		demo.demo3();
	}
}　　

 

运行结果如下，可以看到在demo1、demo2、demo3方法的前后都增加了切面函数