在使用SpringBoot做接口访问如何做接口的限流，这里我们可以使用google的Guava包来实现，当然我们也可以自己实现限流，Guava中的限流是久经考验的我们没必需重新再去写一个，如果想了解限流原理的同学可以自己查阅一下相关的资料，本文不作过来说明噢。
使用说明
在项目中引入Guava相关包
http://mvnrepository.com/artifact/com.google.guava/guava/21.0
maven项目
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<!-- https://mvnrepository.com/artifact/com.google.guava/guava --><dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>21.0</version></dependency> |
gradle项目
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// https://mvnrepository.com/artifact/com.google.guava/guavacompile group: 'com.google.guava', name: 'guava', version: '21.0' |
写一个SpringMVC的拦截器
SmoothBurstyInterceptor.java
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import com.google.common.util.concurrent.RateLimiter;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.util.concurrent.TimeUnit;public class SmoothBurstyInterceptor extends HandlerInterceptorAdapter { public enum LimitType { DROP,//丢弃 WAIT //等待 } /** * 限流器 */ private RateLimiter limiter; /** * 限流方式 */ private LimitType limitType = LimitType.DROP; public SmoothBurstyInterceptor() { this.limiter = RateLimiter.create(10); } /** * @param tps 限流量 (每秒处理量) * @param limitType 限流类型:等待/丢弃(达到限流量) */ public SmoothBurstyInterceptor(int tps, SmoothBurstyInterceptor.LimitType limitType) { this.limiter = RateLimiter.create(tps); this.limitType = limitType; } /** * @param permitsPerSecond 每秒新增的令牌数 * @param limitType 限流类型:等待/丢弃(达到限流量) */ public SmoothBurstyInterceptor(double permitsPerSecond, SmoothBurstyInterceptor.LimitType limitType) { this.limiter = RateLimiter.create(permitsPerSecond, 1000, TimeUnit.MILLISECONDS); this.limitType = limitType; } @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { if (limitType.equals(LimitType.DROP)) { if (limiter.tryAcquire()) { return super.preHandle(request, response, handler); } } else { limiter.acquire(); return super.preHandle(request, response, handler); } throw new Exception("网络异常!");//达到限流后，往页面提示的错误信息。 } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { super.postHandle(request, response, handler, modelAndView); } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { super.afterCompletion(request, response, handler, ex); } public RateLimiter getLimiter() { return limiter; } public void setLimiter(RateLimiter limiter) { this.limiter = limiter; }} |
SpringMVC拦截配置
WebConfig.java
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@Componentpublic class WebConfig extends WebMvcConfigurerAdapter { @Override public void addInterceptors(InterceptorRegistry registry) { // 多个拦截器组成一个拦截器链 registry.addInterceptor(new SmoothBurstyInterceptor(100, SmoothBurstyInterceptor.LimitType.DROP)).addPathPatterns("/**"); //限流可配置为SmoothBurstyInterceptor.LimitType.DROP丢弃请求或者SmoothBurstyInterceptor.LimitType.WAIT等待，100为每秒的速率 super.addInterceptors(registry); }} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：http://blog.csdn.net/dounine/article/details/71439809
