Spring Cloud Zuul 获取当前请求的路由信息

基本思路

参考spring-cloud-zuul-ratelimit开源项目，在过滤器中根据当前的请求路径，判断当前的路由信息，当取得路由信息后，能够对服务的调用次数作统计等操做。

具体实现

建立一个AbstractRouteFilter

public abstract class AbstractRouteFilter extends ZuulFilter {

    private final RouteLocator routeLocator;
    private final UrlPathHelper urlPathHelper;

    AbstractRouteFilter(RouteLocator routeLocator,UrlPathHelper urlPathHelper){
        this.routeLocator = routeLocator;
        this.urlPathHelper = urlPathHelper;
    }
	//核心逻辑，获取请求路径，利用RouteLocator返回路由信息
    protected Route route(HttpServletRequest request){
        String requestURI = urlPathHelper.getPathWithinApplication(request);
        return routeLocator.getMatchingRoute(requestURI);
    }

}

使用时，继承AbstractRouteFilter便可，下面演示一个服务调用次数的过滤器示例

示例

public class RouteTimesFilter extends AbstractRouteFilter {

    public RouteTimesFilter(RouteLocator routeLocator, UrlPathHelper urlPathHelper) {
        super(routeLocator,urlPathHelper);
    }

    @Override
    public String filterType() {
		//能够根据业务要求，修改过滤器类型
        return "post";
    }

    @Override
    public int filterOrder() {
		//过滤器顺序
        return 0;
    }

    @Override
    public boolean shouldFilter() {
		//能够根据业务要求，过滤相关路由
        return true;
    }

    @Override
    public Object run() {
        RequestContext ctx = RequestContext.getCurrentContext();
        Route route = route(ctx.getRequest());
		//获取到路由信息，就能够作想要作的事了
        System.out.println(route);
        return null;
    }
}

配置过滤器

@Component
public class ZuulFilterConfig {

    @Bean
    public ZuulFilter routeTimesFilter(RouteLocator routeLocator){
        return new RouteTimesFilter(routeLocator,new UrlPathHelper());
    }

}