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依赖 !-- https://mvnrepository.com/artifact/com.google.guava/guava --dependencygroupIdcom.google.guava/groupIdartifactIdguava/artifactIdversion32.1.3-jre/version/dependency注解
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;Target(value ElementType.METHOD)
Retention(value RetentionPolicy.RUNTIME)
public interface RateConfigAnno {String limitType();double limitCount() default 5d;
}aop
import cn.hutool.core.thread.ThreadUtil;
import com.alibaba.fastjson2.JSONObject;
import com.google.common.util.concurrent.RateLimiter;
import com.tjbchtyw.tjflowcontrol.annocation.RateConfigAnno;
import com.tjbchtyw.tjflowcontrol.helper.RateLimitHelper;
import jakarta.servlet.ServletOutputStream;
import jakarta.servlet.http.HttpServletResponse;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;import java.io.IOException;
import java.lang.reflect.Method;
import java.nio.charset.StandardCharsets;
import java.util.Objects;Aspect
Component
public class GuavaLimitAop {private static final Logger logger LoggerFactory.getLogger(GuavaLimitAop.class);Before(annotation(com.tjbchtyw.tjflowcontrol.annocation.RateConfigAnno))public void limit(JoinPoint joinPoint) {//1、获取当前的调用方法Method currentMethod getCurrentMethod(joinPoint);if (Objects.isNull(currentMethod)) {return;}//2、从方法注解定义上获取限流的类型String limitType currentMethod.getAnnotation(RateConfigAnno.class).limitType();double limitCount currentMethod.getAnnotation(RateConfigAnno.class).limitCount();//使用guava的令牌桶算法获取一个令牌获取不到先等待RateLimiter rateLimiter RateLimitHelper.getRateLimiter(limitType, limitCount);// boolean b true;boolean pass rateLimiter.tryAcquire();if (pass) {System.out.println(获取到令牌);}else {//重试 仅测试用 有优化方案可以放在评论区for (int i 0; i 5; i) {ThreadUtil.safeSleep(1000);System.out.println(第 (i 1) 次获取令牌);if(rateLimiter.tryAcquire()) break;if(i 4){System.out.println(在第 (i 1) 次后未获取到令牌 开始限流);HttpServletResponse resp ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getResponse();JSONObject jsonObjectnew JSONObject();jsonObject.put(success,false);jsonObject.put(msg,限流中);try {output(resp, jsonObject.toJSONString());}catch (Exception e){logger.error(error,e:{},e);}}}}}private Method getCurrentMethod(JoinPoint joinPoint) {Method[] methods joinPoint.getTarget().getClass().getMethods();Method target null;for (Method method : methods) {if (method.getName().equals(joinPoint.getSignature().getName())) {target method;break;}}return target;}public void output(HttpServletResponse response, String msg) throws IOException {response.setContentType(application/json;charsetUTF-8);ServletOutputStream outputStream null;try {outputStream response.getOutputStream();outputStream.write(msg.getBytes(StandardCharsets.UTF_8));} catch (IOException e) {e.printStackTrace();} finally {outputStream.flush();outputStream.close();}}
}helper
import com.google.common.util.concurrent.RateLimiter;import java.util.HashMap;
import java.util.Map;public class RateLimitHelper {private RateLimitHelper(){}private static final MapString,RateLimiter rateMap new HashMap();public static RateLimiter getRateLimiter(String limitType, double limitCount ){RateLimiter rateLimiter rateMap.get(limitType);if(rateLimiter null){rateLimiter RateLimiter.create(limitCount);rateMap.put(limitType,rateLimiter);}return rateLimiter;}}Test
RestControllerTag(name 测试Controller, description 这是描述)RequestMapping(/pred-api)public class FlowController {AutowiredFlowContext flowContext;PostMapping(/pdf/test)//Count 限制次数RateConfigAnno(limitType makePdf,limitCount 15)Operation(summary 限流接口)public String flowCont(Parameter(name pdfParam, description 参数对象,type标识执行不同的策略) RequestBody Param Param) {return test;}}
