springboot项目注解限制接口访问次数

1.导包

        
            net.jodah
            expiringmap
            0.5.10
        

2.定义注解

package com.kc.framework.aspectj.lang.annotation;

import java.lang.annotation.*;

/**
 * @ClassName LimitRequest 定义一个切面，执行方法前去ExpiringMap查询该IP在规定时间内请求了多少次，如超过次数则直接返回请求失败。
 * @Author HuGang
 * @e-mail [email protected]
 * @Date 15:33 2022/11/29
 **/
@Documented
@Target(ElementType.METHOD) // 说明该注解只能放在方法上面
@Retention(RetentionPolicy.RUNTIME)
public @interface LimitRequest {
    long time() default 6000; // 限制时间 单位：毫秒
    int count() default 600; // 允许请求的次数
}

3.自定义aop切面

package com.kc.framework.aspectj;

import com.kc.framework.aspectj.lang.annotation.LimitRequest;
import com.kc.framework.web.domain.AjaxResult;
import net.jodah.expiringmap.ExpirationPolicy;
import net.jodah.expiringmap.ExpiringMap;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;

/**
 * @Description: LimitRequestAspect
 * @Author: HuGang  [email protected]
 * @CreateDate: 2022/11/29 15:38
 */
@Aspect
@Component
public class LimitRequestAspect {
    private static ConcurrentHashMap> book = new ConcurrentHashMap<>();

    // 定义切点
    // 让所有有@LimitRequest注解的方法都执行切面方法
    @Pointcut("@annotation(limitRequest)")
    public void excudeService(LimitRequest limitRequest) {
    }

    @Around("excudeService(limitRequest)")
    public Object doAround(ProceedingJoinPoint pjp, LimitRequest limitRequest) throws Throwable {

        // 获得request对象
        RequestAttributes ra = RequestContextHolder.getRequestAttributes();
        ServletRequestAttributes sra = (ServletRequestAttributes) ra;
        HttpServletRequest request = sra.getRequest();

        // 获取Map对象， 如果没有则返回默认值
        // 第一个参数是key， 第二个参数是默认值
        ExpiringMap uc = book.getOrDefault(request.getRequestURI(), ExpiringMap.builder().variableExpiration().build());
        Integer uCount = uc.getOrDefault(request.getRemoteAddr(), 0);


        if (uCount >= limitRequest.count()) { // 超过次数，不执行目标方法
              return "请求次数过多，已经限制,"+limitRequest.time()+"毫秒内超过"+uCount+"次！";
            //return AjaxResult.error("请求次数过多，已经限制,"+limitRequest.time()+"毫秒内超过"+uCount+"次！");
        } else if (uCount == 0) { // 第一次请求时，设置有效时间
            uc.put(request.getRemoteAddr(), uCount + 1, ExpirationPolicy.CREATED, limitRequest.time(), TimeUnit.MILLISECONDS);
        } else { // 未超过次数， 记录加一
            uc.put(request.getRemoteAddr(), uCount + 1);
        }
        book.put(request.getRequestURI(), uc);

        // result的值就是被拦截方法的返回值
        Object result = pjp.proceed();

        return result;
    }
}

4.接口添加注解

@LimitRequest(count = 600,time = 6000)

5.测试接口

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