频率限制

src/main/java/com/sqx/common/annotation/Limiting.java

@@ -0,0 +1,19 @@
+package com.sqx.common.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * 限流注解
+ * @author GYJoker
+ */
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Limiting {
+    // 默认每秒放入桶中的token
+    double limitNum() default 20;
+
+    String name() default "";
+}

src/main/java/com/sqx/common/aspect/RateLimitAspect.java

@@ -0,0 +1,61 @@
+package com.sqx.common.aspect;
+
+import com.google.common.util.concurrent.RateLimiter;
+import com.sqx.common.annotation.Limiting;
+import lombok.extern.slf4j.Slf4j;
+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.stereotype.Component;
+
+import java.lang.reflect.Method;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * @author GYJoker
+ */
+@Aspect
+@Component
+@Slf4j
+public class RateLimitAspect {
+    private ConcurrentHashMap<String, RateLimiter> RATE_LIMITER = new ConcurrentHashMap<>();
+    private RateLimiter rateLimiter;
+
+    @Pointcut("@annotation(com.sqx.common.annotation.Limiting)")
+    public void serviceLimit() {
+    }
+
+    @Around("serviceLimit()")
+    public Object around(ProceedingJoinPoint point) throws Throwable {
+        //获取拦截的方法名
+        Signature sig = point.getSignature();
+        //获取拦截的方法名
+        MethodSignature msig = (MethodSignature) sig;
+        //返回被织入增加处理目标对象
+        Object target = point.getTarget();
+        //为了获取注解信息
+        Method currentMethod = target.getClass().getMethod(msig.getName(), msig.getParameterTypes());
+        //获取注解信息
+        Limiting annotation = currentMethod.getAnnotation(Limiting.class);
+        //获取注解每秒加入桶中的token
+        double limitNum = annotation.limitNum();
+        // 注解所在方法名区分不同的限流策略
+        String functionName = msig.getName();
+
+        if (RATE_LIMITER.containsKey(functionName)) {
+            rateLimiter = RATE_LIMITER.get(functionName);
+        } else {
+            RATE_LIMITER.put(functionName, RateLimiter.create(limitNum));
+            rateLimiter = RATE_LIMITER.get(functionName);
+        }
+        if (rateLimiter.tryAcquire()) {
+            return point.proceed();
+        } else {
+            log.info("超过限流限制, {}", functionName);
+            throw new RuntimeException("服务器繁忙，请稍后再试。");
+        }
+    }
+}