如何根据HTTP方法进行Zuul动态路由并通过“serviceId”解析目标主机？

如何基于Zuul进行动态路由HTTP方式（获取/发布/放置...）？ 例如，当您需要路由POST请求给不同的主机而不是'中描述的默认值zuul.routes.*'...

zuul:
  routes:
    first-service:
      path: /first/**
      serviceId: first-service
      stripPrefix: false

    second-service:
      path: /second/**
      serviceId: second-service
      stripPrefix: false

IE。当我们要求'获取/首先' 然后 Zuul 将请求路由到 '优先服务'，但如果我们要求'发布/首先' 然后 Zuul 将请求路由到 '二次服务'.

要实现基于 HTTP 方法的动态路由，我们可以创建一个自定义的 'route https://spring.io/guides/gs/routing-and-filtering/#_add_a_filter' type ZuulFilter并通过以下方式解析“serviceId”DiscoveryClient。例如：

@Component
public class PostFilter extends ZuulFilter {

    private static final String REQUEST_PATH = "/first";
    private static final String TARGET_SERVICE = "second-service";
    private static final String HTTP_METHOD = "POST";

    private final DiscoveryClient discoveryClient;

    public PostOrdersFilter(DiscoveryClient discoveryClient) {
        this.discoveryClient = discoveryClient;
    }

    @Override
    public String filterType() {
        return "route";
    }

    @Override
    public int filterOrder() {
        return 0;
    }

    @Override
    public boolean shouldFilter() {
        RequestContext context = RequestContext.getCurrentContext();
        HttpServletRequest request = context.getRequest();
        String method = request.getMethod();
        String requestURI = request.getRequestURI();
        return HTTP_METHOD.equalsIgnoreCase(method) && requestURI.startsWith(REQUEST_PATH);
    }

    @Override
    public Object run() {

        RequestContext context = RequestContext.getCurrentContext();
        List<ServiceInstance> instances = discoveryClient.getInstances(TARGET_SERVICE);
        try {
            if (instances != null && instances.size() > 0) {
                context.setRouteHost(instances.get(0).getUri().toURL());
            } else {
                throw new IllegalStateException("Target service instance not found!");
            }
        } catch (Exception e) {
            throw new IllegalArgumentException("Couldn't get service URL!", e);
        }
        return null;
    }
}