一、直接通过配置文件配置路由

这是最简单的配置方式

zuul:
  routes:
    baidu: 
      url: http://www.baidu.com/**

这种方式将http://localhost:8080/baidu/**转到http://www.baidu.com/**。

二、修改ZuulProperties实现路由配置

如果要转发的路由太多，不可能全部写在配置文件中，可以在数据库中获取配置，然后封装ZuulProperties。

@Bean
public SimpleRouteLocator zuulRouteLocator(ZuulProperties zuulProperties, IZuulRouteDataRepository dataRepository) {
    Map<String, ZuulProperties.ZuulRoute> routeMap = zuulProperties.getRoutes();
    List<ZuulRouteData> data = dataRepository.findAll();
    ZuulProperties.ZuulRoute zuulRoute;
    for (ZuulRouteData routeData : data) {
        zuulRoute = new ZuulProperties.ZuulRoute();
        // 如path = "baidu"
        String path = routeData.getPath();
        zuulRoute.setId(path);
        zuulRoute.setPath("/" + path + "/**");
        zuulRoute.setUrl(routeData.getUrl());
        zuulRoute.setRetryable(false);
        zuulRoute.setStripPrefix(true);
        zuulRoute.setSensitiveHeaders(new HashSet<>());
        routeMap.put(path, zuulRoute);
    }
    zuulProperties.setRoutes(routeMap);
    return new SimpleRouteLocator("", zuulProperties);
}

这种实现方式效果如方式一，相当于从数据库封装好ZuulProperties路由信息。

三、自定义RouteLocator实现动态路由配置

1. 自定义RouteLocator。数据从redis中获取。实现RefreshableRouteLocator用于动态刷新路由配置。

   @Slf4j
   public class ZuulRouteLocator extends SimpleRouteLocator implements RefreshableRouteLocator {
   
       private ZuulProperties properties;
       private StringRedisTemplate redisTemplate;
   
       public ZuulRouteLocator(String servletPath, ZuulProperties properties, StringRedisTemplate redisTemplate) {
           super(servletPath, properties);
           this.properties = properties;
           this.redisTemplate = redisTemplate;
       }
   
       @Override
       public void refresh() {
           doRefresh();
       }
   
       @Override
       protected Map<String, ZuulProperties.ZuulRoute> locateRoutes() {
           LinkedHashMap<String, ZuulProperties.ZuulRoute> routesMap = new LinkedHashMap<>();
           //从application.properties中加载路由信息
           routesMap.putAll(super.locateRoutes());
           //从db中加载路由信息
           routesMap.putAll(locateRoutesFromRedis());
           //优化一下配置
           LinkedHashMap<String, ZuulProperties.ZuulRoute> values = new LinkedHashMap<>();
           for (Map.Entry<String, ZuulProperties.ZuulRoute> entry : routesMap.entrySet()) {
               String path = entry.getKey();
               // Prepend with slash if not already present.
               if (!path.startsWith(HsbConstants.PREFIX.value)) {
                   path = HsbConstants.PREFIX.value + path;
               }
               if (StringUtils.hasText(this.properties.getPrefix())) {
                   path = this.properties.getPrefix() + path;
                   if (!path.startsWith(HsbConstants.PREFIX.value)) {
                       path = HsbConstants.PREFIX.value + path;
                   }
               }
               values.put(path, entry.getValue());
               log.info("Created route configuration，path:{}，route:{}", path, JSON.toJSONString(entry.getValue()));
           }
           log.info("Created all route configuration，the count is:{}", values.size());
           return values;
       }
   
       private Map<String, ZuulProperties.ZuulRoute> locateRoutesFromRedis() {
           Map<String, ZuulProperties.ZuulRoute> routes = new LinkedHashMap<>();
           //所有第三方系统
           List<Object> thirdPartySystemList = redisTemplate.opsForHash().values("thirdPartySystem");
           ZuulProperties.ZuulRoute zuulRoute;
           for (Object msg : thirdPartySystemList) {
               if (StringUtils.isEmpty(msg)) {
                   continue;
               }
               ThirdPartySystem thirdPartySystem = JSONObject.parseObject(msg.toString(), ThirdPartySystem.class);
               if (thirdPartySystem == null) {
                   continue;
               }
               //系统标识，作为转发到第三方系统的唯一标识
               String identification = thirdPartySystem.getIdentification();
               if (StringUtils.isEmpty(identification)) {
                   continue;
               }
               String url = thirdPartySystem.getAddress();
               if (StringUtils.isEmpty(url)) {
                   continue;
               }
               zuulRoute = new ZuulProperties.ZuulRoute();
               zuulRoute.setSensitiveHeaders(new HashSet<>());
               zuulRoute.setRetryable(false);
               zuulRoute.setId(identification);
               zuulRoute.setPath(HsbConstants.PREFIX.value + identification + "/**");
               zuulRoute.setUrl(url);
               zuulRoute.setStripPrefix(true);
               routes.put(zuulRoute.getPath(), zuulRoute);
           }
           return routes;
       }
   }
   

2. 动态刷新路由配置。

   @Service
   @Slf4j
   public class RefreshRouteService {
   
       private final ApplicationEventPublisher publisher;
   
       private final RouteLocator routeLocator;
   
       @Autowired
       public RefreshRouteService(ApplicationEventPublisher publisher, RouteLocator routeLocator) {
           this.publisher = publisher;
           this.routeLocator = routeLocator;
       }
   
       public void refreshRoute() {
           RoutesRefreshedEvent routesRefreshedEvent = new RoutesRefreshedEvent(routeLocator);
           publisher.publishEvent(routesRefreshedEvent);
           log.info("Updating route configuration");
       }
   }
   

3. 简单的路由配置。如果路由比较多，但是不复杂，可以直接使用SimpleRouteLocator来实现。如：

@Bean
public SimpleRouteLocator zuulRouteLocator(ZuulProperties zuulProperties, IZuulRouteDataRepository dataRepository) {
    Map<String, ZuulProperties.ZuulRoute> routeMap = zuulProperties.getRoutes();
    List<ZuulRouteData> data = dataRepository.findAll();
    ZuulProperties.ZuulRoute zuulRoute;
    for (ZuulRouteData routeData : data) {
        zuulRoute = new ZuulProperties.ZuulRoute();
        String path = routeData.getPath();
        zuulRoute.setId(path);
        zuulRoute.setPath("/" + path + "/**");
        zuulRoute.setUrl(routeData.getUrl());
        zuulRoute.setRetryable(false);
        zuulRoute.setStripPrefix(true);
        zuulRoute.setSensitiveHeaders(new HashSet<>());
        routeMap.put(path, zuulRoute);
    }
    zuulProperties.setRoutes(routeMap);
    return new SimpleRouteLocator("", zuulProperties);
}