使用redis计数来控制单位时间内对某接口的访问量，防止刷验证码接口之类的

使用自定义注解的方式，在需要被限制访问频率的方法上加注解即可控制。

看实现方式，基于springboot，aop，redis。

新建Springboot工程，引入redis，aop。

创建注解

package com.tianyalei.annotation;

import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;

import java.lang.annotation.*;

/**
 * Created by wuwf on 17/7/6.
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@Documented
//最高优先级
@Order(Ordered.HIGHEST_PRECEDENCE)
public @interface RequestLimit {
    /**
     * 允许访问的次数
     */
    int count() default 5;

    /**
     * 时间段，多少时间段内运行访问count次
     */
    long time() default 60000;

}

Aspect切面处理逻辑

package com.tianyalei.aspect;

import com.tianyalei.annotation.RequestLimit;
import com.tianyalei.util.HttpRequestUtil;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
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.util.concurrent.TimeUnit;

/**
 * Created by wuwf on 17/7/6.
 */
@Component
@Aspect
public class RequestLimitAspect {
    private final Logger logger = LoggerFactory.getLogger(getClass());
    @Autowired
    private RedisTemplate<String, String> redisTemplate;

    @Before("execution(public * com.tianyalei.controller.*.*(..)) && @annotation(limit)")
    public void requestLimit(JoinPoint joinpoint, RequestLimit limit) {
        // 接收到请求，记录请求内容
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();

        String ip = HttpRequestUtil.getIpAddr(request);
        String url = request.getRequestURL().toString();
        String key = "req_limit_".concat(url).concat(ip);

        //加1后看看值
        long count = redisTemplate.opsForValue().increment(key, 1);
        //刚创建
        if (count == 1) {
            //设置1分钟过期
            redisTemplate.expire(key, limit.time(), TimeUnit.MILLISECONDS);
        }
        if (count > limit.count()) {
            logger.info("用户IP[" + ip + "]访问地址[" + url + "]超过了限定的次数[" + limit.count() + "]");
            throw new RuntimeException("超出访问次数限制");
        }
    }
}

获取IP的工具类

package com.tianyalei.util;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * Created by admin on 17/7/6.
 */
public class HttpRequestUtil {
    /**
     * 获取当前网络ip
     *
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = request.getHeader("x-forwarded-for");
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
            ipAddress = request.getRemoteAddr();
            if (ipAddress.equals("127.0.0.1") || ipAddress.equals("0:0:0:0:0:0:0:1")) {
                //根据网卡取本机配置的IP
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ipAddress = inet.getHostAddress();
            }
        }
        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
        if (ipAddress != null && ipAddress.length() > 15) { //"***.***.***.***".length() = 15
            if (ipAddress.indexOf(",") > 0) {
                ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
            }
        }
        return ipAddress;
    }
}

通过Controller验证

@RestController
public class IndexController {
    @RequestLimit(count = 4)
    @GetMapping("/index")
    public Object index() {
        return 1;
    }
}

启动工程，多次访问index看看效果即可。