Zuul- 启动，咱们提到了zuulRefreshRoutesListener，能够用来动静刷新路由，咱们看看他是怎么加载的。
一下这几个事件会触发reset办法。
public void onApplicationEvent(ApplicationEvent event) { if (event instanceof ContextRefreshedEvent || event instanceof RefreshScopeRefreshedEvent || event instanceof RoutesRefreshedEvent || event instanceof InstanceRegisteredEvent) { reset(); } else if (event instanceof ParentHeartbeatEvent) { ParentHeartbeatEvent e = (ParentHeartbeatEvent) event; resetIfNeeded(e.getValue()); } else if (event instanceof HeartbeatEvent) { HeartbeatEvent e = (HeartbeatEvent) event; resetIfNeeded(e.getValue()); }}DiscoveryClientRouteLocator#locateRoutes
追着这个办法上来，咱们最初会到DiscoveryClientRouteLocator#locateRoutes办法。这里次要是获取两个中央的配置，一个是咱们的配置文件，一个是Eureka的注册表信息。
protected LinkedHashMap<String, ZuulRoute> locateRoutes() { LinkedHashMap<String, ZuulRoute> routesMap = new LinkedHashMap<>(); // 先调用父类的办法， routesMap.putAll(super.locateRoutes()); if (this.discovery != null) { Map<String, ZuulRoute> staticServices = new LinkedHashMap<>(); for (ZuulRoute route : routesMap.values()) { String serviceId = route.getServiceId(); if (serviceId == null) { serviceId = route.getId(); } if (serviceId != null) { staticServices.put(serviceId, route); } } // 从Eureka获取注册表信息 List<String> services = this.discovery.getServices(); // 是否有过滤的条件 String[] ignored = this.properties.getIgnoredServices() .toArray(new String[0]); for (String serviceId : services) { String key = "/" + mapRouteToService(serviceId) + "/**"; if (staticServices.containsKey(serviceId) && staticServices.get(serviceId).getUrl() == null) { ZuulRoute staticRoute = staticServices.get(serviceId); if (!StringUtils.hasText(staticRoute.getLocation())) { staticRoute.setLocation(serviceId); } } if (!PatternMatchUtils.simpleMatch(ignored, serviceId) && !routesMap.containsKey(key)) { routesMap.put(key, new ZuulRoute(key, serviceId)); } } } if (routesMap.get(DEFAULT_ROUTE) != null) { ZuulRoute defaultRoute = routesMap.get(DEFAULT_ROUTE); routesMap.remove(DEFAULT_ROUTE); routesMap.put(DEFAULT_ROUTE, defaultRoute); } // 返回本地配置+Eureka未过滤的注册表 LinkedHashMap<String, ZuulRoute> values = new LinkedHashMap<>(); for (Entry<String, ZuulRoute> entry : routesMap.entrySet()) { String path = entry.getKey(); // Prepend with slash if not already present. if (!path.startsWith("/")) { path = "/" + path; } if (StringUtils.hasText(this.properties.getPrefix())) { path = this.properties.getPrefix() + path; if (!path.startsWith("/")) { path = "/" + path; } } values.put(path, entry.getValue()); } return values;}Eureka的注册表有个IgnoredServices配置，咱们能够对他进行过滤，这样防止服务名称间接裸露进去。
zuul: ignoredServices: '*' routes: users: /myusers/**SimpleRouteLocator#locateRoutes
读取本地的时候，间接从ZuulProperties取值。
protected Map<String, ZuulRoute> locateRoutes() { LinkedHashMap<String, ZuulRoute> routesMap = new LinkedHashMap<>(); for (ZuulRoute route : this.properties.getRoutes().values()) { routesMap.put(route.getPath(), route); } return routesMap;}ZuulProperties被加载的时候，因为有一个@PostConstruct注解，他会调用init办法。在这里会依据咱们的配置信息进行赋值serviceId、id、path。
@PostConstructpublic void init() { for (Entry<String, ZuulRoute> entry : this.routes.entrySet()) { ZuulRoute value = entry.getValue(); if (!StringUtils.hasText(value.getLocation())) { value.serviceId = entry.getKey(); } if (!StringUtils.hasText(value.getId())) { value.id = entry.getKey(); } if (!StringUtils.hasText(value.getPath())) { value.path = "/" + entry.getKey() + "/**"; } }}流程图
动静路由
咱们晓得了什么时候触发路由的从新加载，那咱们能够在路由信息扭转的时候，就调用触发他的条件，比方RoutesRefreshedEvent。
咱们晓得了他的加载流程，先本地再注册核心，咱们也能够自定义本人的加载流程，比方先本地，再数据库，数据库变更，就触发RoutesRefreshedEvent工夫，达到动静路由的目标。