如何解析在Clojure中的URL参数？ [英] How to parse URL parameters in Clojure?

问题描述

如果我有请求size = 3& mean = 1& sd = 3& type = pdf& distr = normal （defn request-> map [request] ...）接受此请求，
返回映射 {：size 3， ：mean 1，：sd 3，：type pdf，：distr normal}

这里是我的尝试（使用clojure.walk和clojure。 string）：

 （defn request-to-map 
 [request] 
（keywordize-keys 
（apply hash-map 
（split request＃（& | =）））））
  

我对其他人如何解决这个问题很感兴趣。

解决方案

Java库的数量。除非我仔细阅读URI规范，并确保没有丢失任何边缘情况（例如，在查询中出现两次不同值的参数），否则我会犹豫要尝试滚动我自己的解析器。这使用 jetty-util ： / p>

 （import'[org.eclipse.jetty.util UrlEncoded MultiMap]）
 
（defn parse- query-string [query] 
（let [params（MultiMap。）] 
（UrlEncoded / decodeTo query paramsUTF-8）
（into {} params）））
 
 user> （parse-query-stringsize = 3& mean = 1& sd = 3& type = pdf& distr = normal）
 {sd3，mean normal，typepdf，size3} 
  

If I have the request "size=3&mean=1&sd=3&type=pdf&distr=normal" what's the idiomatic way of writing the function (defn request->map [request] ...) that takes this request and returns a map {:size 3, :mean 1, :sd 3, :type pdf, :distr normal}

Here is my attempt (using clojure.walk and clojure.string):

(defn request-to-map
   [request]
   (keywordize-keys
      (apply hash-map
             (split request #"(&|=)"))))

I am interested in how others would solve this problem.

解决方案

You can do this easily with a number of Java libraries. I'd be hesitant to try to roll my own parser unless I read the URI specs carefully and made sure I wasn't missing any edge cases (e.g. params appearing in the query twice with different values). This uses jetty-util:

(import '[org.eclipse.jetty.util UrlEncoded MultiMap])

(defn parse-query-string [query]
  (let [params (MultiMap.)]
    (UrlEncoded/decodeTo query params "UTF-8")
    (into {} params)))

user> (parse-query-string "size=3&mean=1&sd=3&type=pdf&distr=normal")
{"sd" "3", "mean" "1", "distr" "normal", "type" "pdf", "size" "3"}

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