SpringBoot防止大量请求攻击的实现

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

/**
 * 自定义注解，用于拦截过于频繁的请求
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface AccessLimit {
    int seconds();
    int maxCount();
    boolean needLogin() default true;
}

import com.qykhhr.dujiaoshouservice.exceptionhandler.DujiaoshouException;
import com.qykhhr.dujiaoshouservice.mycomment.AccessLimit;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

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

/**
 * 自定义拦截器
 */
@Component
public class AccessLimtInterceptor implements HandlerInterceptor {

    @Autowired
    private RedisTemplate redisTemplate;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        if (handler instanceof HandlerMethod) {
            HandlerMethod hm = (HandlerMethod) handler;
            AccessLimit accessLimit = hm.getMethodAnnotation(AccessLimit.class);
            if (null == accessLimit) {
                return true;
            }
            int seconds = accessLimit.seconds();
            int maxCount = accessLimit.maxCount();
            boolean needLogin = accessLimit.needLogin();

            if (needLogin) {
                //判断是否登录
            }
            String ip=request.getRemoteAddr();
            String key = request.getServletPath() + ":" + ip ;
            Integer count = (Integer) redisTemplate.opsForValue().get(key);

            if (null == count || -1 == count) {
                redisTemplate.opsForValue().set(key, 1,seconds, TimeUnit.SECONDS);
                return true;
            }

            if (count < maxCount) {
                count = count+1;
                redisTemplate.opsForValue().set(key, count,0);
                return true;
            }

            //  response 返回 json 请求过于频繁请稍后再试
            throw new DujiaoshouException(20001,"操作过于频繁");
        }

        return true;
    }
}

import com.qykhhr.dujiaoshouservice.Interceptor.AccessLimtInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * 在webconfig中配置拦截器
 */
@Configuration
public class MyWebMvcConfigurer extends WebMvcConfigurerAdapter {

    @Autowired
    private AccessLimtInterceptor accessLimtInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(accessLimtInterceptor);
        super.addInterceptors(registry);
    }
}

@RestController
public class AppHomeController {

    @GetMapping("/index")
    @AccessLimit(seconds = 1, maxCount = 3) //1秒内 允许请求3次
    public R getImageList(){
        return R.ok().data("appHome","hahaha");
    }
}