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使用 Spring Boot 自定义注解和AOP实现基于IP的接口限流和黑白名单

在我们日常开发的项目中为了保证系统的稳定性，很多时候我们需要对系统做限流处理，它可以有效防止恶意请求对系统造成过载。常见的限流方案主要有：

网关限流： NGINX、Zuul 等 API 网关
服务器端限流： 服务端接口限流
令牌桶算法： 通过定期生成令牌放入桶中，请求需要消耗令牌才能通过
熔断机制： Hystrix、Resilience4j 等

本文将详细介绍 Spring Boot 通过自定义注解和 AOP（面向切面编程），实现基于 IP 的限流和黑白名单功能，包括如何使用 Redis 存储限流和黑名单信息。

项目搭建

添加必要的依赖。在 pom.xml 文件中添加以下内容：

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-aop</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId></dependency>
</dependencies>

配置 application.yml 加入 redis 配置

spring:#redisredis:# 地址host: 127.0.0.1# 端口，默认为6379port: 6379# 数据库索引database: 0# 密码password: password# 连接超时时间timeout: 10slettuce:pool:# 连接池中的最小空闲连接min-idle: 0# 连接池中的最大空闲连接max-idle: 8# 连接池的最大数据库连接数max-active: 8# #连接池最大阻塞等待时间（使用负值表示没有限制）max-wait: -1ms

自定义限流注解

创建一个自定义注解 RateLimit ：

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface RateLimit {//限制次数int limit() default 5;//限制时间 秒int timeout() default 60;
}

编写限流切面

使用 AOP 实现限流逻辑，并增加 IP 黑白名单判断 , 使用 Redis 来存储和检查请求次数及黑名单信息。

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;import javax.servlet.http.HttpServletRequest;
import java.util.concurrent.TimeUnit;@Aspect
@Component
public class RateLimitAspect {@Autowiredprivate StringRedisTemplate redisTemplate;@Autowiredprivate HttpServletRequest request;//定义黑名单key前缀private static final String BLACKLIST_KEY_PREFIX = "blacklist:";//定义白名单key前缀private static final String WHITELIST_KEY_PREFIX = "whitelist:";@Around("@annotation(rateLimit)")public Object rateLimit(ProceedingJoinPoint joinPoint, RateLimit rateLimit) throws Throwable {//获取IP// String ip =request.getRemoteAddr();/*** 没有经过代理使用： request.getRemoteAddr();*经过nginx代理使用： request.getHeader("X-Real-IP");**/String ip =IpUtil.getIpAddress(request);  //黑名单则直接异常if (isBlacklisted(ip)) {throw new RuntimeException("超出访问限制已加入黑名单，1小时后再访问");}//如果是白名单下的不做限制if (isWhitelisted(ip)) {return joinPoint.proceed();}String key = generateKey(joinPoint, ip);int limit = rateLimit.limit();int timeout = rateLimit.timeout();String countStr = redisTemplate.opsForValue().get(key);int count = countStr == null ? 0 : Integer.parseInt(countStr);if (count < limit) {redisTemplate.opsForValue().set(key, String.valueOf(count + 1), timeout, TimeUnit.SECONDS);return joinPoint.proceed();} else {addToBlacklist(ip);throw new RuntimeException("超出请求限制IP已被列入黑名单");}}// 判断是否在黑名单列表内private boolean isBlacklisted(String ip) {return redisTemplate.hasKey(BLACKLIST_KEY_PREFIX + ip);}// 是否在白名单内private boolean isWhitelisted(String ip) {return redisTemplate.hasKey(WHITELIST_KEY_PREFIX + ip);}// 添加ip到白名单内private void addToBlacklist(String ip) {redisTemplate.opsForValue().set(BLACKLIST_KEY_PREFIX + ip, "true", 1, TimeUnit.HOURS);}// redis key 拼接private String generateKey(ProceedingJoinPoint joinPoint, String ip) {String methodName = joinPoint.getSignature().getName();String className = joinPoint.getTarget().getClass().getName();return className + ":" + methodName + ":" + ip;}
}

/*** IP工具类*/
public class IpUtil {/*** 获取ip* @param request 请求* @return {@link String }*/public static String getIpAddress(HttpServletRequest request) {String ipAddress = null;try {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")) {// 根据网卡取本机配置的IPInetAddress 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()// = 15if (ipAddress.indexOf(",") > 0) {ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));}}} catch (Exception e) {ipAddress="";}// ipAddress = this.getRequest().getRemoteAddr();return ipAddress;}/*** 获取网关ip* @param request 请求* @return {@link String }*/public static String getGatwayIpAddress(ServerHttpRequest request) {HttpHeaders headers = request.getHeaders();String ip = headers.getFirst("x-forwarded-for");if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {// 多次反向代理后会有多个ip值，第一个ip才是真实ipif (ip.indexOf(",") != -1) {ip = ip.split(",")[0];}}if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = headers.getFirst("Proxy-Client-IP");}if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = headers.getFirst("WL-Proxy-Client-IP");}if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = headers.getFirst("HTTP_CLIENT_IP");}if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = headers.getFirst("HTTP_X_FORWARDED_FOR");}if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = headers.getFirst("X-Real-IP");}if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {ip = request.getRemoteAddress().getAddress().getHostAddress();}return ip;}
}

Controller中使用限流注解

创建一个简单的限流测试Controller，并在需要限流的方法上使用 @RateLimit 注解：，需要编写异常处理，返回RateLimitAspect异常信息，并以字符串形式返回

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;@RestController
@RequestMapping("/api")
public class TestController {@RateLimit(limit = 5, timeout = 60)@GetMapping("/limit")public String testRateLimit() {return "Request successful!";}
}