Spring：AOP 在不影响原来业务的情况下实现动态增强

aop需要导入的包

        
            org.aspectj
            aspectjweaver
            1.9.4
        
    

配置文件applicationContext.xml

UserServiceImpl

package com.lan.service;

public class UserServiceImpl implements UserService{
    @Override
    public void add() {
        System.out.println("增加了一个用户");
    }

    @Override
    public void delete() {
        System.out.println("删除了一个用户");
    }

    @Override
    public void update() {
        System.out.println("修改了一个用户");
    }

    @Override
    public void select() {
        System.out.println("查询了一个用户");
    }
}

Log

package com.lan.log;

import org.springframework.aop.MethodBeforeAdvice;

import java.lang.reflect.Method;

public class Log implements MethodBeforeAdvice {
    @Override
    //Method method:要执行的目标对象的方法
    //Object[] args：参数
    //Object target：目标对象
    public void before(Method method, Object[] args, Object target) throws Throwable {
        System.out.println(target.getClass().getName()+"的"+method.getName()+"方法被执行了");
    }
}

AfterLog

package com.lan.log;

import org.springframework.aop.AfterReturningAdvice;

import java.lang.reflect.Method;

public class AfterLog implements AfterReturningAdvice {
    @Override
    //Object returnValue:返回值
    public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
        System.out.println("执行了"+method.getName()+"方法,返回结果为:"+returnValue);
    }
}

MyTest

import com.lan.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    public static void main(String[] args) {
      ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
      //动态代理代理的是接口 这里返回的必须是一个接口
        UserService userService = (UserService) context.getBean("userService");
        userService.add();
    }
}

package com.lan.diy;

public class DiyPointCut {
    public void before(){
        System.out.println("======方法执行前=====");
    }
    public void after(){
        System.out.println("======方法执行后======");
    }
}

applicationContext.xml

AnnotationPointCat

package com.lan.diy;

import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

@Aspect//标注这个类是一个切面
public class AnnotationPointCat {
    @Before("execution(* com.lan.service.UserServiceImpl.*(..))")
    public void before(){
        System.out.println("======方法执行前=====");
    }
    @After("execution(* com.lan.service.UserServiceImpl.*(..))")
    public void after(){
        System.out.println("======方法执行后======");
    }
}

applicationContext.xml

MyTest

import com.lan.service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    public static void main(String[] args) {
      ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
      //动态代理代理的是接口 这里返回的必须是一个接口
        UserService userService = (UserService) context.getBean("userService");
        userService.add();
    }
}