Spring Cloud Zuul 获取当前请求的路由信息和路由后端的服务节点信息

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，可以对服务的调用次数做统计等操作。

具体实现

创建一个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即可，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() {
        //可以根据业务要求，修改过滤器类型
        return "post";
    }
    @Override
    public int filterOrder() {
        //过滤器顺序
        return 0;
    }
    @Override
    public boolean shouldFilter() {
        //可以根据业务要求，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，就可以做想要做的事了
        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());
    }
}

路由到后端的服务节点信息

/**
     * 打印目标节点地址
     * @param logMap
     * @param ctx
     */
    private void printTargetUri(Map<String, Object> logMap,RequestContext ctx) {
        //打印targetUri
        if((Boolean) ctx.get("isSuccess")){
            RibbonHttpResponse ribbonHttpResponse = (RibbonHttpResponse)ctx.get("zuulResponse");
            URI uri=null;
            try {
                //反射获取私有成员变量
                RibbonApacheHttpResponse ribbonApacheHttpResponse = (RibbonApacheHttpResponse)ReflectionUtils.
                        getPrivateField(ribbonHttpResponse,"response");
                uri = ribbonApacheHttpResponse.getRequestedURI();
                logger.info("targetUri:"+uri);
            } catch (NoSuchFieldException e) {
                e.printStackTrace();
            }catch (IllegalAccessException ie){
                ie.printStackTrace();
            }
        }
    }