Spring中基于注解的AOP配置

常用四种通知类型

1.业务层接口

public interface AccountService {
    //模拟保存账户
    void saveAccount();
    //模拟更新账户
    void updateAccount(int i);
    //模拟删除账户
    int deleteAccount();
}

2.业务层实现类

import org.springframework.stereotype.Service;
@Service("accountService")
public class AccountServiceImpl implements AccountService {
    public void saveAccount() {
        System.out.println("执行了保存");
        int i=1/0;
    }
    public void updateAccount(int i) {
        System.out.println("执行了更新");
    }
    public int deleteAccount() {
        System.out.println("执行了删除");
        return 0;
    }
}

3.Logger类

@Component("logger")
@Aspect//表示当前类是一个切面类
public class Logger {
    @Pointcut("execution(* com.hh.service.*.*(..))")
    private void pt(){}
    //前置通知
    @Before("pt()")
    public void  beforePrintLog(){
        System.out.println("前置通知Logger类中的beforePrintLog方法开始记录日志");
    }
    //后置通知
    @After("pt()")
    public void  afterReturnPrintLog(){
        System.out.println("后置通知Logger类中的afterReturnPrintLog方法开始记录日志");
    }
    //异常通知
    @AfterThrowing("pt()")
    public void  afterThrowingPrintLog(){
        System.out.println("异常通知Logger类中的afterThrowingPrintLog方法开始记录日志");
    }
    //最终通知
    @AfterReturning("pt()")
    public void  afterPrintLog(){
        System.out.println("最终通知Logger类中的afterPrintLog方法开始记录日志");
    }
}

4.配置文件

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

    <!--配置Spring创建容器时要扫描的包-->
    <context:component-scan base-package="com.hh"/>
    <!--配置spring开启注解的支持-->
    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
</beans>

5.测试类

public class AOPTest {
    public static void main(String[] args) {
        //获取容器
        ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
        //获取对象
        AccountService accountService = context.getBean("accountService", AccountService.class);
        //执行方法
        accountService.saveAccount();
    }
}

环绕通知

Logger类

package com.hh.utils;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;

@Component("logger")
@Aspect//表示当前类是一个切面类
public class Logger {

    @Pointcut("execution(* com.hh.service.*.*(..))")
    private void pt(){}
    @Around("pt()")
    public Object  aroundPrintLog(ProceedingJoinPoint pjp){
        Object result = null;
        try {
            Object[] args = pjp.getArgs();//得到方法执行的返回参数

            System.out.println("Logger类中的aroundPrintLog方法开始记录日志...前置");

            pjp.proceed(args);//明确调用业务层方法

            System.out.println("Logger类中的aroundPrintLog方法开始记录日志...后置");
            return result;
        } catch (Throwable throwable) {
            System.out.println("Logger类中的aroundPrintLog方法开始记录日志...异常");
            throw new RuntimeException(throwable);
        }finally {
            System.out.println("Logger类中的aroundPrintLog方法开始记录日志...最终");
        }
    }
}