該篇介紹的內容如題，就是利用redis實現接口的限流（ 某時間范圍內 最大的訪問次數 ） 。

慣例，先看下我們的實戰目錄結構：

首先是pom.xml 核心依賴：

<!--用于redis數據庫連接--><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId></dependency><!--用于redis lettuce 連接池pool使用--><dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-pool2</artifactId></dependency><dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId></dependency>

然后是application.yml里面的redis接入配置：

spring: redis: lettuce: pool:#連接池最大連接數 使用負值代表無限制 默認為8max-active: 10#最大空閑連接 默認8max-idle: 10#最小空閑連接 默認0min-idle: 1 host: 127.0.0.1 password: 123456 port: 6379 database: 0 timeout: 2000msserver: port: 8710

redis的配置類， RedisConfig.java：

ps：可以看到日期是18年的，因為這些redis的整合教程，在這個系列里面一共有快10篇，不了解的看客如果感興趣可以去看一看。

import com.fasterxml.jackson.annotation.JsonAutoDetect;import com.fasterxml.jackson.annotation.PropertyAccessor;import com.fasterxml.jackson.databind.ObjectMapper;import org.springframework.cache.CacheManager;import org.springframework.cache.annotation.EnableCaching;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.data.redis.cache.RedisCacheConfiguration;import org.springframework.data.redis.cache.RedisCacheManager;import org.springframework.data.redis.connection.RedisConnectionFactory;import org.springframework.data.redis.core.RedisTemplate;import org.springframework.data.redis.core.StringRedisTemplate;import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;import org.springframework.data.redis.serializer.RedisSerializationContext;import org.springframework.data.redis.serializer.StringRedisSerializer; import static org.springframework.data.redis.cache.RedisCacheConfiguration.defaultCacheConfig; /** * @Author: JCccc * @CreateTime: 2018-09-11 * @Description: */@Configuration@EnableCachingpublic class RedisConfig { @Bean public CacheManager cacheManager(RedisConnectionFactory connectionFactory) {RedisCacheConfiguration cacheConfiguration =defaultCacheConfig().disableCachingNullValues().serializeValuesWith(RedisSerializationContext.SerializationPair.fromSerializer(new Jackson2JsonRedisSerializer(Object.class)));return RedisCacheManager.builder(connectionFactory).cacheDefaults(cacheConfiguration).build(); } @Bean public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {RedisTemplate<String, Object> redisTemplate = new RedisTemplate<>();redisTemplate.setConnectionFactory(factory);Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);ObjectMapper om = new ObjectMapper();om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);jackson2JsonRedisSerializer.setObjectMapper(om);//序列化設置 ，這樣為了存儲操作對象時正常顯示的數據，也能正常存儲和獲取redisTemplate.setKeySerializer(new StringRedisSerializer());redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);redisTemplate.setHashKeySerializer(new StringRedisSerializer());redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);return redisTemplate; } @Bean public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory factory) {StringRedisTemplate stringRedisTemplate = new StringRedisTemplate();stringRedisTemplate.setConnectionFactory(factory);return stringRedisTemplate; }}

自定義注解：

import java.lang.annotation.*; /** * @Author JCccc * @Description * @Date 2021/7/23 11:46 */@Inherited@Documented@Target({ElementType.FIELD, ElementType.TYPE, ElementType.METHOD})@Retention(RetentionPolicy.RUNTIME)public @interface RequestLimit { /** * 時間內 秒為單位 */ int second() default 10; /** * 允許訪問次數 */ int maxCount() default 5; //默認效果 ： 10秒內 對于使用該注解的接口，只能總請求訪問數 不能大于 5次 }

接下來是攔截器 RequestLimitInterceptor.java：

攔截接口的方式 是通過 ip地址+接口url ，做時間內的訪問計數

import com.elegant.testdemo.annotation.RequestLimit;import com.elegant.testdemo.utils.IpUtil;import com.fasterxml.jackson.databind.ObjectMapper;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.method.HandlerMethod;import org.springframework.web.servlet.HandlerInterceptor; import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.util.concurrent.TimeUnit; /** * @Author JCccc * @Description * @Date 2021/7/23 11:49 */ @Componentpublic class RequestLimitInterceptor implements HandlerInterceptor { private final Logger log = LoggerFactory.getLogger(this.getClass()); @Autowired private RedisTemplate<String, Object> redisTemplate; @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {try { if (handler instanceof HandlerMethod) {HandlerMethod handlerMethod = (HandlerMethod) handler;// 獲取RequestLimit注解RequestLimit requestLimit = handlerMethod.getMethodAnnotation(RequestLimit.class);if (null==requestLimit) { return true;}//限制的時間范圍int seconds = requestLimit.second();//時間內的 最大次數int maxCount = requestLimit.maxCount();String ipAddr = IpUtil.getIpAddr(request);// 存儲keyString key = ipAddr+':'+request.getContextPath() + ':' + request.getServletPath();// 已經訪問的次數Integer count = (Integer) redisTemplate.opsForValue().get(key);log.info('檢測到目前ip對接口={}已經訪問的次數', request.getServletPath() , count);if (null == count || -1 == count) { redisTemplate.opsForValue().set(key, 1, seconds, TimeUnit.SECONDS); return true;}if (count < maxCount) { redisTemplate.opsForValue().increment(key); return true;}log.warn('請求過于頻繁請稍后再試');returnData(response);return false; } return true;} catch (Exception e) { log.warn('請求過于頻繁請稍后再試'); e.printStackTrace();}return true; } public void returnData(HttpServletResponse response) throws IOException {response.setCharacterEncoding('UTF-8');response.setContentType('application/json; charset=utf-8');ObjectMapper objectMapper = new ObjectMapper();//這里傳提示語可以改成自己項目的返回數據封裝的類response.getWriter().println(objectMapper.writeValueAsString('請求過于頻繁請稍后再試'));return; } }

接下來是 攔截器的配置 WebConfig.java:

import com.elegant.testdemo.interceptor.RequestLimitInterceptor;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.WebMvcConfigurer; /** * @Author JCccc * @Description * @Date 2021/7/23 11:52 */ @Configurationpublic class WebConfig implements WebMvcConfigurer { @Autowired private RequestLimitInterceptor requestLimitInterceptor; @Override public void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(requestLimitInterceptor) //攔截所有請求路徑.addPathPatterns('/**')//再設置 放開哪些路徑.excludePathPatterns('/static/**','/auth/login'); } }

最后還有兩個工具類

IpUtil：

https://www.jb51.net/article/218249.htm

RedisUtil :

https://www.jb51.net/article/218246.htm

最后寫個測試接口

TestController.java

import com.elegant.testdemo.annotation.RequestLimit;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController; /** * @Author JCccc * @Description * @Date 2021/7/23 11:55 */@RestControllerpublic class TestController { @GetMapping('/test') @RequestLimit(maxCount = 3,second = 60) public String test() {return '你好，如果對你有幫助，請點贊加關注。'; } }

這個/test接口的注解，我們設置的是 60秒內 最大訪問次數為 3次 （實際應用應該是根據具體接口做相關的次數限制。）

然后使用postman測試一下接口：

前面三次都是請求通過的：

第四次：

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