Spring Boot项目引入maven依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
            <version>2.1.1.RELEASE</version>
        </dependency>

package pers.wmx.springbootfreemarkerdemo.aspect;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @author: wangmingxin03
 * @date: 2020-09-02
 */
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
public @interface ActionAspect {
    String value() default "";
}

package pers.wmx.springbootfreemarkerdemo.aspect;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Component;

/**
 * @author: wangmingxin03
 * @date: 2020-09-02
 */
@Aspect
@Component
@Lazy
public class MyAspect {

    //切面
    @Pointcut("@annotation(pers.wmx.springbootfreemarkerdemo.aspect.ActionAspect)")
    public void access() {

    }

    //环绕
    @Before("access()")
    public void doBefore() {
        System.out.println("do before");
    }

    //环绕
    @Around("access() && @annotation(actionAspect)")
    public Object doAround(ProceedingJoinPoint joinPoint, ActionAspect actionAspect) throws Throwable {
        System.out.println(actionAspect.value());

        //do something

        Object result = joinPoint.proceed();
        System.out.println(result);
        return result;
    }

}

@Around("access() && @annotation(actionAspect)")

这样可以拿到注解里的值

@ActionAspect(value = "do aspect")
    @RequestMapping("/response/test")
    @ResponseBody
    public User testResponse1(){
        User user = new User();
        user.setUserName("xinye");
        user.setDescription("shuaiqi");
        return user;
    }

调接口输出：

do aspect
do before
pers.wmx.springbootfreemarkerdemo.entity.User@61e35138

通过切面编程往往可以达到很多奇效

有时候想做一些全局的前置和后置处理，可以尝试搞搞，通过自定义注解比较灵活

转载请注明：汪明鑫的个人博客 » Spring Boot 自定义注解实现切面编程