SpringBoot 自定义注解实现过程

    4.0.0
    
        org.springframework.boot
        sp服务器托管网ring-boot-starter-parent
        2.6.1
         
    
    org.example
    SpringBoot-Test
    1.0-SNAPSHOT

    
        UTF-8
        UTF-8
        1.8
    
    
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.aspectj
            aspectjrt
        
        
            org.aspectj
            aspectjweaver
        
        
            junit
            junit
            4.12
        
    

package com.springboot.annotation;

import java.lang.annotation.*;

@Target(ElementType.METHOD)//注解实现位置
@Retention(RetentionPolicy.RUNTIME)//元注解 运行时生效
@Documented
@Inherited
public @interface MyAnotion {
    String operation() default "";
}

package com.springboot.aop;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;


import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.Method;

@Aspect //声明为切面类
@Component服务器托管网 //扫描到容器中
public class MyAnnotationAspect {
    @Around(value = "@annotation(com.springboot.annotation.MyAnotion)")
    public Object logAround(ProceedingJoinPoint joinPoint) throws Throwable {
        //方法参数
        Object[] joinPointArgs = joinPoint.getArgs();
        //方法名称 首先获取签名
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();
        Method method = signature.getMethod();
        String methodName = method.toString();
        //获取方法上的注解
        //获取ip地址
        ServletRequestAttributes requestAttributes =
                (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = requestAttributes.getRequest();
        String ip = request.getRemoteAddr();
        //获取方法执行时间
        System.out.println("=======请求前=======");
        //执行方法
        joinPoint.proceed();
        System.out.println("=======请求后=======");
        return null;
    }
}

package com.springboot.controller;

import com.springboot.annotation.MyAnotion;
import org.junit.Test;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping(value = "test")
public class TestController {
    @Test
    @MyAnotion
    @RequestMapping(value = "/demo")
    public void Demo(){
        System.out.println("请求成功!");
    }
}