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小编给大家分享一下SpringMVC如何实现限流，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
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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
com.google.guava guava 21.0
gradle项目
// https://mvnrepository.com/artifact/com.google.guava/guava compile group: 'com.google.guava', name: 'guava', version: '21.0'
写一个SpringMVC的拦截器
SmoothBurstyInterceptor.java
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
@Component
public 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);
}
}看完了这篇文章，相信你对“SpringMVC如何实现限流”有了一定的了解，如果想了解更多相关知识，欢迎关注创新互联行业资讯频道，感谢各位的阅读！
