Spring 基于注解的AOP

1、首先修改bean.xml的配置信息

目录的结构可以看上一篇文章https://blog.csdn.net/weixin_44588495/article/details/93377796

<?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-3.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop.xsd">
</beans>
           

配置Spring创建容器时要扫描的包，配置Spring创建容器时要扫描的包

<context:component-scan base-package="com.spring" ></context:component-scan>
 <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
           

2、配置AOP信息

对实现类添加注解，保证扫描包的时候该对象进入IOC容器

@Service("accountService")
public class AccountService implements IAccountService {
           

@Component("logger")
public class Logger {
           

logger类

package com.spring.utils;

import javafx.beans.binding.ObjectExpression;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;

/**
 * 提供公共方法
 */
@Component("logger")
@Aspect//表示当前类是一个切面类
public class Logger {
    @Pointcut("execution(* com.spring.service.*.*(..))")
    private void pt(){}
    /**
     * 前置通知
     */
    @Before("pt()")
    public void beforePrintLog(){
        System.out.println("前置通知before记录日志");
    }

    /**
     * 后置通知
     */
    @AfterReturning("pt()")
    public void afterReturnPrintLog(){
        System.out.println("后置通知afterReturn记录日志");
    }
    /**
     * 异常通知
     */
    @AfterThrowing("pt()")
    public void afterThrowPrintLog(){
        System.out.println("异常通知before记录日志");
    }
    /**
     * 最终通知
     */
    @After("pt()")
    public void afterPrintLog(){
        System.out.println("最终通知after记录日志");
    }
    /**
     * 环绕通知
     */
    //@Around("pt()")
    public void arroundLog(ProceedingJoinPoint pjp){
      
        System.out.println("环绕通知");
    }
}

           

执行：

直接使用这四个注解的方式它的调用顺序是有问题的。

• 使用环绕通知：执行四种通知

@Around("pt()")
    public Object arroundLog(ProceedingJoinPoint pjp){
        Object rtValue = null;
        try {
            Object[] args = pjp.getArgs();
            System.out.println("前置通知");
            rtValue =  pjp.proceed(args);
            System.out.println("后置通知");
            return rtValue;
        } catch (Throwable throwable) {
            System.out.println("异常通知");
            throwable.printStackTrace();
        }finally {
            System.out.println("最终通知");
        }
        System.out.println("环绕通知");
        return null;
    }
           

执行：这样的顺序就没问题了

对于注解开发，更建议大家使用环绕通知，而不是四种注解的方式。

同时我们也可以修改为全注解的方式。用注解的配置类代替bean.xml文件。

bean.xml文件的信息如下：

<?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"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop.xsd">
        <context:component-scan base-package="com.spring" ></context:component-scan>
        <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
</beans>
           

新建一个SpringConfiguration类

package config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@Configuration
@ComponentScan(basePackages = "com.spring")
@EnableAspectJAutoProxy
public class SpringConfiguration {
}

           

修改test类

package com.spring.test;

import com.spring.service.IAccountService;
import config.SpringConfiguration;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test {
    public static void main(String[] args) {
        ApplicationContext ac = new AnnotationConfigApplicationContext(SpringConfiguration.class);
        IAccountService accountService = (IAccountService) ac.getBean("accountService");
        accountService.saveAccount();
    }
}

           

执行：