java Redisson 实现限流每秒/分钟/小时限制N个

1.引入maven包:

        <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId></dependency><dependency><groupId>org.redisson</groupId><artifactId>redisson</artifactId><version>3.11.1</version></dependency>

2.代码实现:

a.RedissonConfig 初始化

package com.hanyc.demo.config;import org.redisson.Redisson;
import org.redisson.api.RedissonClient;
import org.redisson.config.Config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import java.util.ArrayList;
import java.util.List;/*** redisson** @author hanyc* @date 2024/12/31 13:30* @company: */
@Configuration
public class RedissonConfig {@Autowiredprivate RedisProperties redisProperties;@Beanpublic RedissonClient redissonClient() {Config config = new Config();if (redisProperties.getCluster() != null && !redisProperties.getCluster().getNodes().isEmpty()) {RedisProperties.Cluster cluster = redisProperties.getCluster();List<String> nodes = cluster.getNodes();List<String> newNodes = new ArrayList<>();nodes.forEach(index -> newNodes.add(index.startsWith("redis://") ? index : "redis://" + index));config.useClusterServers().addNodeAddress(newNodes.toArray(new String[0])).setPassword(redisProperties.getPassword());} else {String address = "redis://" + redisProperties.getHost() + ":" + redisProperties.getPort();config.useSingleServer().setAddress(address).setPassword(redisProperties.getPassword());}RedissonClient redisson = Redisson.create(config);return redisson;}
}

b.UserRateLimiterInterceptor 用户请求限流拦截器

package com.hanyc.demo.config;import cn.hutool.extra.servlet.ServletUtil;
import lombok.extern.slf4j.Slf4j;
import org.redisson.api.RRateLimiter;
import org.redisson.api.RateIntervalUnit;
import org.redisson.api.RateType;
import org.redisson.api.RedissonClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** @Description: 用户请求限流拦截器* @Author hanyc* @Date 2024/12/12**/
@Component
@Slf4j
public class UserRateLimiterInterceptor implements HandlerInterceptor {@Autowiredprivate RedissonClient redissonClient;@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {// 假设这个方法能够从请求中解析出用户IDString userIdStr = "";String userIp = ServletUtil.getClientIP(request);// 假设用户ID 为 1String userId = "1";if (userId == null) {// 所有未登录账号 不需要验证的请求,都使用userId=10000userIdStr = userIp;} else {userIdStr = userId.toString();}// 为每个用户生成唯一的限流键String rateLimiterKey = "USER_RATE_LIMITER" + userIdStr;// 删除 Redis 中存储的限流器状态（清除缓存）// RRateLimiter 在内部将配置保存在 Redis 中，并且这些配置是持久化的。删除该键后，Redis 会丢失之前存储的限流配置，从而确保新的配置能够被应用。redissonClient.getBucket(rateLimiterKey).delete();// 获取分布式的 RRateLimiter 实例RRateLimiter rateLimiter = redissonClient.getRateLimiter(rateLimiterKey);// 初始化限流器，限制每两秒最多 10 次请求// 参数说明: // RateType.OVERALL 全局// rate 时间限制内可以请求多少次// rateInterval 多少时间内限制// 时间单位 可以秒/分钟/小时等rateLimiter.trySetRate(RateType.OVERALL, 10, 2, RateIntervalUnit.SECONDS);log.info("当前路由为:{} userIdStr:{} userIp:{}", request.getRequestURI(), userIdStr, userIp);// 尝试获取令牌，如果获取不到说明超过请求限制if (rateLimiter.tryAcquire()) {// 允许继续处理请求return true;} else {// 如果获取不到令牌，则说明请求超过了限制，可以在这里抛出异常或者返回错误信息log.warn("当前异常的路由为:{} userIdStr:{} userIp :{}", request.getRequestURI(), userIdStr, userIp);return false;}}}

c. WebMvcConfig 添加自定义拦截器

package com.hanyc.demo.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;/*** MVC自定义配置** @author hanyc*/
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {@Beanpublic UserRateLimiterInterceptor userRateLimiterInterceptor() {return new UserRateLimiterInterceptor();}@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(userRateLimiterInterceptor()).addPathPatterns("/**");}
}