Question

我正在学习使用Closure / Compojure，我在构建一个小型网络应用程序时遇到了问题。

我在mywebapp / routes.clj上定义了以下路由

(defroutes app-routes
  (GET "/" [] (index-page))
  (GET "/about" [] (about-page))
  (GET "/bluebutton" [] (bluebutton-page))
  (GET "/bluebutton/patient" [] (patient-handler))
  (route/resources "/")
  (route/not-found "No page"))

那个不起作用/ bluebutton / patient的那个，我希望用以下代码获得JSON响应：

(use '[ring.middleware.json :only [wrap-json-response]]
     '[ring.util.response :only [response]])

(defn patient-handler []
  (println "patient-handler")
  (wrap-json-response (response {:body {:foo "bar"}})))

出于某种原因，我在浏览器上收到404响应，但我正在检查REPL输出，我正在执行患者处理程序的代码，你们知道我是否遗漏了什么？

提前致谢！抱歉我的英文奇怪！

Answer 1

wrap-json-response接受一个函数作为它的参数，并返回一个新函数，当被调用时将返回json包装。像这样：

(defn patient-handler []
  (println "patient-handler")
  (middleware/wrap-json-response (fn [_] (response {:body {:foo "bar"}}))))

虽然更普通的应用程序会将其拆分为自己的功能（或整个命名空间）：

(ns hello-web.handler
  (:require [compojure.core :refer :all]
            [compojure.handler :as handler]
            [ring.middleware.json :as middleware]
            [compojure.route :as route]
            [ring.util.response :refer [response]]))

(defroutes app-routes
  (GET "/" [] "Hello World")
  (route/resources "/")
  (GET "/bluebutton/patient" [] (patient-handler))
  (route/not-found "Not Found"))

(def app
  (handler/site app-routes))

(defn create-json-response [request]
  (response {:body {:foo "bar"}}))

(defn patient-handler []
  (println "patient-handler")
  (middleware/wrap-json-response create-json-response))

Clojure wrap-json-response返回404

1 个答案: