使用SpringBoot + Redis 实现接口限流的方式

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

spring.redis.host=localhost
spring.redis.port=6379
spring.redis.password=123

public enum LimitType {
    
    DEFAULT,
    
    IP
}

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RateLimiter {
    
    String key() default "rate_limit:";

    
    int time() default 60;

    
    int count() default 100;

    
    LimitType limitType() default LimitType.DEFAULT;
}

@Configuration
public class RedisConfig {

    @Bean
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory) {
        RedisTemplate<Object, Object> redisTemplate = new RedisTemplate<>();
        redisTemplate.setConnectionFactory(connectionFactory);
        // 使用Jackson2JsonRedisSerialize 替换默认序列化(默认采用的是JDK序列化)
        Jackson2JsonRedisSerializer<Object> 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);
        redisTemplate.setKeySerializer(jackson2JsonRedisSerializer);
        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
        redisTemplate.setHashKeySerializer(jackson2JsonRedisSerializer);
        redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer);
        return redisTemplate;
    }
}

local key = KEYS[1]
local count = tonumber(ARGV[1])
local time = tonumber(ARGV[2])
local current = redis.call('get', key)
if current and tonumber(current) > count then
    return tonumber(current)
end
current = redis.call('incr', key)
if tonumber(current) == 1 then
    redis.call('expire', key, time)
end
return tonumber(current)

@Bean
public DefaultRedisScript<Long> limitScript() {
    DefaultRedisScript<Long> redisScript = new DefaultRedisScript<>();
    redisScript.setScriptSource(new ResourceScriptSource(new ClassPathResource("lua/limit.lua")));
    redisScript.setResultType(Long.class);
    return redisScript;
}

@Aspect
@Component
public class RateLimiterAspect {
    private static final Logger log = LoggerFactory.getLogger(RateLimiterAspect.class);
    @Autowired
    private RedisTemplate<Object, Object> redisTemplate;
    @Autowired
    private RedisScript<Long> limitScript;
    @Before("@annotation(rateLimiter)")
    public void doBefore(JoinPoint point, RateLimiter rateLimiter) throws Throwable {
        String key = rateLimiter.key();
        int time = rateLimiter.time();
        int count = rateLimiter.count();

        String combineKey = getCombineKey(rateLimiter, point);
        List<Object> keys = Collections.singletonList(combineKey);
        try {
            Long number = redisTemplate.execute(limitScript, keys, count, time);
            if (number==null || number.intValue() > count) {
                throw new ServiceException("访问过于频繁，请稍候再试");
            }
            log.info("限制请求'{}',当前请求'{}',缓存key'{}'", count, number.intValue(), key);
        } catch (ServiceException e) {
            throw e;
        } catch (Exception e) {
            throw new RuntimeException("服务器限流异常，请稍候再试");
        }
    }

    public String getCombineKey(RateLimiter rateLimiter, JoinPoint point) {
        StringBuffer stringBuffer = new StringBuffer(rateLimiter.key());
        if (rateLimiter.limitType() == LimitType.IP) {
            stringBuffer.append(IpUtils.getIpAddr(((ServletRequestAttributes) RequestContextHolder.currentRequestAttributes()).getRequest())).append("-");
        }
        MethodSignature signature = (MethodSignature) point.getSignature();
        Method method = signature.getMethod();
        Class<?> targetClass = method.getDeclaringClass();
        stringBuffer.append(targetClass.getName()).append("-").append(method.getName());
        return stringBuffer.toString();
    }
}

@RestController
public class HelloController {
    @GetMapping("/hello")
    @RateLimiter(time = 5,count = 3,limitType = LimitType.IP)
    public String hello() {
        return "hello>>>"+new Date();
    }
}

@RestControllerAdvice
public class GlobalException {
    @ExceptionHandler(ServiceException.class)
    public Map<String,Object> serviceException(ServiceException e) {
        HashMap<String, Object> map = new HashMap<>();
        map.put("status", 500);
        map.put("message", e.getMessage());
        return map;
    }
}