Spring Aspect简单实例

首先是在maven的pom中配置需要安装的jar，在原有的spring配置中添加

    org.aspectj
    aspectjweaver
    1.8.9

添加需要被代理的方法，
先写一个接口

package com.north.spring.aop.impl;

public interface Arti {
    public int add(int i, int j);
    public int sub(int i, int j);
    public int div(int i, int j);
    public int mul(int i, int j);
}

再写一个实现类

package com.north.spring.aop.xml;

public class ArtiImpl implements Arti {

    @Override
    public int add(int i, int j) {
        // TODO Auto-generated method stub
        int result = i + j;
        return result;
    }

    @Override
    public int sub(int i, int j) {
        // TODO Auto-generated method stub
        int result = i - j;
        return result;
    }

    @Override
    public int div(int i, int j) {
        // TODO Auto-generated method stub
        int result = i / j;
        return result;
    }

    @Override
    public int mul(int i, int j) {
        // TODO Auto-generated method stub
        int result = i * j;
        return result;
    }

}

然后写一个代理的方法

package com.north.spring.aop.xml;

import java.util.Arrays;
import java.util.List;

import org.aspectj.lang.JoinPoint;


public class LoggingAspect {

    private void declarePointExpresson() {}
    //前置
    public void beforeMethod(JoinPoint joinpoint) {
        String name = joinpoint.getSignature().getName();
        List

配置xml文件

最后写测试方法

package com.north.spring.aop.xml;

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

public class TestAop {
    public static void main(String[] args) {
        ApplicationContext ctx =  new ClassPathXmlApplicationContext("application-xml.xml");

        Arti arti = (Arti) ctx.getBean("arti");

        int result = arti.add(3, 6);

        System.out.println(result);

        result = arti.div(11, 0);
        System.out.println(result);
    }
}

打印结果


2.通过注解配置，另外的一样，只是代理的方法和xml文件不同，需要加上注解
XML文件需要扫描当前包

package com.north.spring.aop.impl;

import java.util.Arrays;
import java.util.List;

import org.aopalliance.intercept.Joinpoint;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
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;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class LoggingAspect {

    @Pointcut("execution(public int com.north.spring.aop.impl.*.*(int,int))")
    private void declarePointExpresson() {}

    @Before("declarePointExpresson()")
    public void beforeMethod(JoinPoint joinpoint) {
        String name = joinpoint.getSignature().getName();
        List

结果和上图一样