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

/**
 * 自定義注解
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface LimitAccess {

    /**
     * 限制訪問的key
     * @return
     */
    String key();

    /**
     * 限制訪問時(shí)間
     * @return
     */
    int times();
}

import com.hezy.annotation.LimitAccess;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import java.util.concurrent.TimeUnit;

/**
 * AOP類（通知類）
 */
@Component
@Aspect
public class LimitAspect {

    @Autowired
    private RedisTemplate redisTemplate;

    @Pointcut("@annotation(com.hezy.annotation.LimitAccess)")
    public void pt(){};

    @Around("pt()")
    public Object aopAround(ProceedingJoinPoint pjp) throws Throwable {
        // 獲取切入點(diǎn)上面的自定義注解
        Signature signature = pjp.getSignature();

        MethodSignature methodSignature = (MethodSignature) signature;

        // 獲取方法上面的注解
        LimitAccess limitAccess = methodSignature.getMethod().getAnnotation(LimitAccess.class);

        // 獲取注解上面的屬性
        int limit = limitAccess.times();
        String key = limitAccess.key();

        // 根據(jù)key去找Redis中的值
        Object o = redisTemplate.opsForValue().get(key);

        // 如果不存在，說明是首次訪問，存入Redis，過期時(shí)間為limitAccess中的time
        if (o == null) {
            redisTemplate.opsForValue().set(key, "", limit, TimeUnit.SECONDS);
            // 執(zhí)行切入點(diǎn)的方法
            return pjp.proceed();
        } else {
            // 如果存在，說明不是首次訪問，拋出異常
            throw new RuntimeException("訪問過于頻繁");
        }
    }
}

    @GetMapping("/limit")
    @LimitAccess(key = "limit", times = 10)
    public String limit() {
        return "success";
    }