使springAOP生效不一定要加@EnableAspectJAutoProxy注解

8个月前程序员胖胖胖虎阿

34 0 0

一、效果演示

以下面的例子演示，

业务类，

UserService.java

package com.my.template.service;

import com.my.template.entity.User;
import org.springframework.stereotype.Service;

/**
 * @date 2022/8/9 15:28
 */
@Service
public class UserService implements Us{
    @Override
    public void saveUser(User user){
        System.out.println("保存user对象到数据库:"+user);
    }
}

切面类，

LogAspect.java

package com.my.template.aop;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

/**
 * @date 2022/8/11 14:12
 */
@Component
@Aspect
public class LogAspect {
    @Pointcut("execution(* com.my.template.service.UserService.*(..))")
    public void pointCut(){

    }
    @Before(value = "pointCut()")
    public void before(JoinPoint joinPoint){
        System.out.println("方法执行前-20220816");
    }

    @AfterReturning(value = "pointCut()")
    public void after(JoinPoint joinPoint){
        System.out.println("方法执行后-20220816");
    }
}

测试的controller

UserController.java

package com.my.template.controller;

import com.my.template.entity.User;
import com.my.template.service.Us;
import com.my.template.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @date 2022/8/9 15:35
 */
@RestController
public class UserController {
    @Autowired
    private Us us;
    @RequestMapping("/saveUser")
    public String saveUser(){

        User user=new User();
        user.setId("1");
        user.setName("张三");
        us.saveUser(user);
        return "success";
    }
}

sprinboot的启动类，

BootServer.java

package com.my.template;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.context.annotation.ImportResource;

/**
 * 启动类
 * @date 2022/6/3 21:32
 */
@SpringBootApplication()
public class BootServer {
    public static void main(String[] args) {
        try {
            SpringApplication.run(BootServer.class);
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}

测试结果如下，

2022-08-16 22:30:44.082  INFO 25716 --- [nio-9099-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 6 ms
方法执行前-20220816
保存user对象到数据库:User{name='张三', id='1'}
方法执行后-20220816

从上面的测试结果来看，没有加@EnableAspectJAutoProxy注解，但是AOP生效了，这是为什么？

二、为什么不加@EnableAspectJAutoProxy切面生效

关于这个问题我排查了很久，最后在依赖中找到了原因，看下pom文件

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>springTemplate</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <!--spring-boot的web依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.3.3.RELEASE</version>
        </dependency>
        <!--自定义的starter-->
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>customer-spring-boot-starter</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <!--使用springAOP需要引入该依赖-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

在依赖中有spring-boot-starter-web的依赖，该依赖有下面的依赖，