This is the link to the question in stackoverflow:
http://stackoverflow.com/questions/38226276/cant-extract-multipart-params-from-post-request-in-compojure
在 2016年7月7日星期四 UTC+8上午10:13:25，aaartu...@gmail.com写道：
>
> When I try to extract the multipart-params from a POST request like this:
>
> (defroutes upload-routes
> (POST "/upload" {params :params} (println params))
>
>
> I got {}.
>
> Then I tried like this:
>
> (defroutes upload-routes
> (POST "/upload" {multipart-params :multipart-params} (println
> multipart-params))
>
> I still got {}.
>
> I guess there are something wrong about my middleware.
>
> So I tried to change the handler, here are the handlers I had tried:
>
> (ns cloudserver.handler
> (:require [compojure.core :refer [defroutes routes]]
> [compojure.route :as route]
> [compojure.handler :as handler]
> [cloudserver.routes.home :refer [home-routes]]
> [noir.util.middleware :as noir-middleware]
> [cloudserver.routes.auth :refer [auth-routes]]
> [cloudserver.routes.upload :refer [upload-routes]]
> [cloudserver.routes.search :refer [search-routes]]
> [cloudserver.routes.download :refer [download-routes]]
> [ring.middleware.defaults :refer [api-defaults wrap-defaults
> site-defaults]]
> [ring.middleware.multipart-params :refer [wrap-multipart-params]]
> [ring.middleware.params :refer [wrap-params]]
> [noir.session :as session]
> [ring.middleware.session.memory :refer [memory-store]]))
>
> (def app
> (->
> (routes auth-routes
> home-routes
> upload-routes
> search-routes
> download-routes
> app-routes)
> session/wrap-noir-session
> (wrap-defaults（assoc-in site-defaults [:security :anti-forgery] false)
> wrap-multipart-params
> wrap-params))
> (def app
> (->
> (routes auth-routes
> home-routes
> upload-routes
> search-routes
> download-routes
> app-routes)
> session/wrap-noir-session
> (wrap-defaults（assoc-in site-defaults [:security :anti-forgery] false)
> wrap-multipart-params))
> (def app
> (->
> (routes auth-routes
> home-routes
> upload-routes
> search-routes
> download-routes
> app-routes)
> session/wrap-noir-session
> (wrap-defaults (-> site-defaults
> (assoc-in [:security :anti-forgery] false)
> (assoc-in [:params :multipart] true)
> (assoc-in [:params :nested] true)))
> handler/site))
> (def app
> (->
> (routes auth-routes
> home-routes
> upload-routes
> search-routes
> download-routes
> app-routes)
> wrap-multipart-params
> session/wrap-noir-session
> (wrap-defaults（assoc-in site-defaults [:security :anti-forgery] false)))
> (def app
> (noir-middleware/app-handler
> [auth-routes
> home-routes
> upload-routes
> search-routes
> download-routes
> app-routes]
> :ring-defaults (assoc site-defaults :security nil)))
>
> But the only result I got is {}
> ------------------------------
>
> My client code is:
>
> public int upload (String filename, String[] tags, String time, String
> fingerprint) throws IOException {
> String url = host + "/upload";
> CloseableHttpClient httpClient =
> HttpClients.custom().setDefaultCookieStore(cookieStore).build();
> HttpPost httpPost = new HttpPost(url);
>
> MultipartEntityBuilder mulentity = MultipartEntityBuilder.create();
>
> mulentity.addBinaryBody("photo", new File(filename));
>
> for (int i = 0; i < tags.length; i ++) {
> mulentity.addTextBody("tag" + i, tags[i]);
> }
>
> mulentity.addTextBody("fingerprint", fingerprint);
> mulentity.addTextBody("time", time);
> mulentity.addTextBody("filename",
> filename.substring(filename.lastIndexOf(File.separatorChar) + 1,
> filename.length()));
>
> HttpEntity entity = mulentity.build();
> httpPost.setEntity(entity);
> httpPost.setHeader("Content-Type", "multipart/form-data;boundary=" +
> BOUNDARY);
>
> int status = 3;
>
> try {
> ResponseHandler<String> responseHandler = new BasicResponseHandler();
> String response = httpClient.execute(httpPost, responseHandler);
> status = Integer.parseInt(response);
> } catch (ClientProtocolException e) {
> e.printStackTrace();
> } catch (UnsupportedEncodingException e) {
> e.printStackTrace();
> } finally {
> httpClient.close();
> }
> return status;
> }
>
> ------------------------------
>
> I am really a green hand in clojure web programming. Thanks a lot!
>
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