处理study接口,添加接口访问限制次数

servers/boe-server-all/src/main/java/com/xboe/school/aspect/LimitRequest.java

@@ -0,0 +1,12 @@
+package com.xboe.school.aspect;
+
+import java.lang.annotation.*;
+
+@Documented
+@Target(ElementType.METHOD)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface LimitRequest {
+
+    long time() default 2000;
+    int count() default Integer.MAX_VALUE;
+}

servers/boe-server-all/src/main/java/com/xboe/school/aspect/LimitRequestAspect.java

@@ -0,0 +1,59 @@
+package com.xboe.school.aspect;
+
+
+import com.xboe.api.vo.Result;
+import net.jodah.expiringmap.ExpirationPolicy;
+import net.jodah.expiringmap.ExpiringMap;
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+import org.aspectj.lang.annotation.Pointcut;
+import org.springframework.stereotype.Component;
+import org.springframework.web.context.request.RequestAttributes;
+import org.springframework.web.context.request.RequestContextHolder;
+import org.springframework.web.context.request.ServletRequestAttributes;
+
+import javax.servlet.http.HttpServletRequest;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.TimeUnit;
+
+@Aspect
+@Component
+public class LimitRequestAspect {
+    private static ConcurrentHashMap<String, ExpiringMap<String, Integer>> book = new ConcurrentHashMap<>();
+    // 定义切点
+    // 让所有有@LimitRequest注解的方法都执行切面方法
+    @Pointcut("@annotation(limitRequest)")
+    public void excudeService(LimitRequest limitRequest) {
+    }
+
+    @Around("excudeService(limitRequest)")
+    public Object doAround(ProceedingJoinPoint pjp, LimitRequest limitRequest) throws Throwable {
+        // 获得request对象
+        RequestAttributes ra = RequestContextHolder.getRequestAttributes();
+        ServletRequestAttributes sra = (ServletRequestAttributes) ra;
+        HttpServletRequest request = sra.getRequest();
+
+        // 获取Map对象， 如果没有则返回默认值
+        // 第一个参数是key， 第二个参数是默认值
+        ExpiringMap<String, Integer> map = book.getOrDefault(request.getRequestURI(), ExpiringMap.builder().variableExpiration().build());
+        Integer uCount = map.getOrDefault(request.getRemoteAddr(), 0);
+
+
+        if (uCount >= limitRequest.count()) { // 超过次数，不执行目标方法
+            //这里的返回对象类型根据controller方法的返回方式一致
+            return Result.error("请求过于频繁，请稍后再试");
+        } else if (uCount == 0){ // 第一次请求时，设置开始有效时间
+            map.put(request.getRemoteAddr(), uCount + 1, ExpirationPolicy.CREATED, limitRequest.time(), TimeUnit.MILLISECONDS);
+        } else { // 未超过次数， 记录数据加一
+            map.put(request.getRemoteAddr(), uCount + 1);
+        }
+        book.put(request.getRequestURI(), map);
+
+        // result的值就是被拦截方法的返回值
+        Object result = pjp.proceed();
+
+        return result;
+    }
+
+}