Spring之AOP系列--AOP执行顺序的用法

灰太狼 2023-09-28 12:40 55阅读 0赞

原文网址：[Spring之AOP系列--AOP执行顺序的用法\_IT利刃出鞘的博客-CSDN博客][Spring_AOP_--AOP_IT_-CSDN]

## 简介 ##

本文用示例介绍Spring（SpringBoot）的AOP的执行顺序。

## 公共代码 ##

**启动类**

package com.example.demo;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class DemoSpringaopSimpleApplication {
        public static void main(String[] args) {
            SpringApplication.run(DemoSpringaopSimpleApplication.class, args);
        }
    }

**Entity**

package com.example.demo.entity;
    
    import lombok.Data;
    
    @Data
    public class User {
        private Integer id;
        private String userName;
        private String note;
    }

**Service**

package com.example.demo.service;
    
    import com.example.demo.entity.User;
    
    public interface UserService {
        public void printUser(User user);
    }

package com.example.demo.service.impl;
    
    import com.example.demo.entity.User;
    import com.example.demo.service.UserService;
    import org.springframework.stereotype.Service;
    
    @Service
    public class UserServiceImpl implements UserService {
        @Override
        public void printUser(User user) {
            if (user == null) {
                throw new RuntimeException("检查用户参数是否为空");
            }
            System.out.print("id = " + user.getId());
            System.out.print("\t userName = " + user.getUserName());
            System.out.println("\t note = " + user.getNote());
        }
    }

**Controller**

package com.example.demo.controller;
    
    import com.example.demo.annotation.OperationLog;
    import com.example.demo.entity.User;
    import com.example.demo.service.UserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    @RequestMapping("/user")
    @Controller
    public class UserController {
        @Autowired
        private UserService userService;
    
        @RequestMapping("/print")
        @ResponseBody
        public User testPrint(User user) {
            userService.printUser(user);
            return user;
        }
    
        @RequestMapping("/add")
        @ResponseBody
        @OperationLog(type = "添加", desc = "添加数据")
        public User testAdd(User user) {
            return user;
        }
    
        @RequestMapping("/update")
        @ResponseBody
        @OperationLog(type = "更新", desc = "更新数据")
        public User testUpdate(User user) {
            userService.printUser(user);
            return user;
        }
    }

## AOP代码 ##

### **AOP1** ###

package com.example.demo.aspect;
    
    import com.example.demo.annotation.OperationLog;
    import com.example.demo.common.util.JsonUtil;
    import com.example.demo.entity.User;
    import org.aspectj.lang.ProceedingJoinPoint;
    import org.aspectj.lang.annotation.*;
    import org.aspectj.lang.reflect.MethodSignature;
    import org.springframework.core.annotation.Order;
    import org.springframework.stereotype.Component;
    
    import java.lang.reflect.Method;
    
    @Aspect
    @Component
    @Order(1)
    public class SimpleAspect {
        @Pointcut("execution(* com.example.demo.service.impl.UserServiceImpl.printUser(..))")
        // 多个切点时可指定优先级
        // @Order(1)
        public void pointCut() {
    
        }
    
        @Before("pointCut()")
        public void before() {
            System.out.println("####################### SimpleAspect.before #######################");
        }
    
        @Around("pointCut()")
        public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
            System.out.println("####################### SimpleAspect.around #######################");
            MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
            Method method = methodSignature.getMethod();
            System.out.println("joinPoint.getTarget().toString()  : " + joinPoint.getTarget().toString());
            System.out.println("methodSignature.getName()         : " + methodSignature.getName());
            System.out.println("method.getName()                  : " + method.getName());
            System.out.println("method.getReturnType().getName()  : " + method.getReturnType().getName());
    
            Object[] objects = joinPoint.getArgs();
            System.out.println(JsonUtil.toJson(objects));
    
            System.out.println("------------------- SimpleAspect.around: around before -------------------");
            Object object = joinPoint.proceed();
            System.out.println("------------------- SimpleAspect.around: 返回值 -------------------");
            System.out.println(JsonUtil.toJson(object));
            System.out.println("------------------- SimpleAspect.around: around after -------------------");
    
            return object;
        }
    
        @After("pointCut()")
        public void after() {
            System.out.println("####################### SimpleAspect.after #######################");
        }
    
        @AfterReturning("pointCut()")
        public void afterReturning() {
            System.out.println("####################### SimpleAspect.afterReturning #######################");
        }
    
        @AfterThrowing("pointCut()")
        public void afterThrowing() {
            System.out.println("####################### SimpleAspect.afterThrowing #######################");
        }
    }

### **AOP2**  ###

package com.example.demo.aspect;
    
    import com.example.demo.common.util.JsonUtil;
    import com.example.demo.entity.User;
    import org.aspectj.lang.ProceedingJoinPoint;
    import org.aspectj.lang.annotation.*;
    import org.aspectj.lang.reflect.MethodSignature;
    import org.springframework.core.annotation.Order;
    import org.springframework.stereotype.Component;
    
    import java.lang.reflect.Method;
    
    @Aspect
    @Component
    @Order(2)
    public class OrderTestAspect {
        @Pointcut("execution(* com.example.demo.service.impl.UserServiceImpl.printUser(..))")
        // 多个切点时可指定优先级
        // @Order(1)
        public void pointCut() {
    
        }
    
        @Before("pointCut()")
        public void before() {
            System.out.println("####################### OrderTestAspect.before #######################");
        }
    
        @Around("pointCut()")
        public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
            System.out.println("####################### OrderTestAspect.around #######################");
            MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
            Method method = methodSignature.getMethod();
            System.out.println("joinPoint.getTarget().toString()  : " + joinPoint.getTarget().toString());
            System.out.println("methodSignature.getName()         : " + methodSignature.getName());
            System.out.println("method.getName()                  : " + method.getName());
            System.out.println("method.getReturnType().getName()  : " + method.getReturnType().getName());
    
            Object[] objects = joinPoint.getArgs();
            System.out.println(JsonUtil.toJson(objects));
    
            System.out.println("------------------- OrderTestAspect.around: around before -------------------");
            Object object = joinPoint.proceed();
            System.out.println("------------------- OrderTestAspect.around: 返回值 -------------------");
            System.out.println(JsonUtil.toJson(object));
            System.out.println("------------------- OrderTestAspect.around: around after -------------------");
    
            return object;
        }
    
        @After("pointCut()")
        public void after() {
            System.out.println("####################### OrderTestAspect.after #######################");
        }
    
        @AfterReturning("pointCut()")
        public void afterReturning() {
            System.out.println("####################### OrderTestAspect.afterReturning #######################");
        }
    
        @AfterThrowing("pointCut()")
        public void afterThrowing() {
            System.out.println("####################### OrderTestAspect.afterThrowing #######################");
        }
    }

## **测试** ##

![a7e5d14d801c44c4921d3816c8bb58f9.png][]

后端结果

####################### SimpleAspect.around #######################
    joinPoint.getTarget().toString()  : com.example.demo.service.impl.UserServiceImpl@1d6f5d26
    methodSignature.getName()         : printUser
    method.getName()                  : printUser
    method.getReturnType().getName()  : void
    [{"id":321,"userName":"Tony","note":"abc"}]
    ------------------- SimpleAspect.around: around before -------------------
    ####################### SimpleAspect.before #######################
    ####################### OrderTestAspect.around #######################
    joinPoint.getTarget().toString()  : com.example.demo.service.impl.UserServiceImpl@1d6f5d26
    methodSignature.getName()         : printUser
    method.getName()                  : printUser
    method.getReturnType().getName()  : void
    [{"id":321,"userName":"Tony","note":"abc"}]
    ------------------- OrderTestAspect.around: around before -------------------
    ####################### OrderTestAspect.before #######################
    id = 321	 userName = Tony	 note = abc
    ####################### OrderTestAspect.afterReturning #######################
    ####################### OrderTestAspect.after #######################
    ------------------- OrderTestAspect.around: 返回值 -------------------
    null
    ------------------- OrderTestAspect.around: around after -------------------
    ####################### SimpleAspect.afterReturning #######################
    ####################### SimpleAspect.after #######################
    ------------------- SimpleAspect.around: 返回值 -------------------
    null
    ------------------- SimpleAspect.around: around after -------------------

可以发现，优先级高的，before先执行，after后执行。

[Spring_AOP_--AOP_IT_-CSDN]: https://knife.blog.csdn.net/article/details/125523137
[a7e5d14d801c44c4921d3816c8bb58f9.png]: https://img-blog.csdnimg.cn/a7e5d14d801c44c4921d3816c8bb58f9.png