记录一次简单的aspect练习

package day03_Spring;

public interface Mat {

    void add(int i,int j);
    void sub(int i,int j);
    void div(int i,int j);
    void mul(int i,int j);
}

 

package day03_Spring;

import org.springframework.stereotype.Component;

@Component
public class MatImpl implements Mat {

    @Override
    public void add(int i, int j) {
        // TODO Auto-generated method stub
        System.out.println(i+j);
    }

    @Override
    public void sub(int i, int j) {
        // TODO Auto-generated method stub
        System.out.println(i-j);
    }

    @Override
    public void div(int i, int j) {
        // TODO Auto-generated method stub
        System.out.println(i/j);
    }

    @Override
    public void mul(int i, int j) {
        // TODO Auto-generated method stub
        System.out.println(i*j);
    }

}

 

package day03_Spring;

import java.util.Arrays;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

@Component
@Aspect
public class ProxyTest{

    @Before(value = "execution(public void day03_Spring.MatImpl.add(int, int))")
    public void beforeMethod(JoinPoint joinPoint) {
        Object[] args=joinPoint.getArgs();
        String methodName=joinPoint.getSignature().getName();
        System.out.println("方法名："+methodName+" 参数："+Arrays.toString(args));
    }
}

 

package day03_Spring;

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

public class Test {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        @SuppressWarnings("resource")
        ApplicationContext ac=new ClassPathXmlApplicationContext("aspect.xml");
        Mat m=ac.getBean("matImpl",Mat.class);//用注解方式配置bean时，此处应该以类首字母小写表示id.并且，此处只能用接口来声明对象然后得到MatImpl的对象。
        m.add(1, 2);
    }

}

 

<?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.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">
    
    <context:component-scan base-package="day03_Spring"></context:component-scan>
    <!-- 开启aspectJ自动代理功能 -->
    <aop:aspectj-autoproxy />
</beans>

 

运行结果：

方法名：add 参数：[1, 2]
3