如何在文件中编写一些transit-clj以及如何从该文件中检索数据结构

时间:2014-08-13 04:20:47

标签: json clojure transit

说我有:

(def c [{:id 12 :name "John"}])

如何在文件中写这个?

如何取回此数据结构?

2 个答案:

答案 0 :(得分:1)

查看文档中read的代码,尤其是底部的代码。 这里有一个完整的例子,说明了你的目标。

答案 1 :(得分:1)

一个不完美的解决方案:

(require '[clojure.java.io :as io]
         '[cognitect.transit :as t])

(def c [{:id 12 :name "John"}])

(def dir "resources/json/")

(defn write-transit [dir file-name file-type coll]
  (let [suffix {:json ".json" :json-verbose ".verbose.json" :msgpack ".mp"}]
    (with-open [out (io/output-stream 
                      (str dir "/" file-name (file-type suffix)))]
        (t/write (t/writer out file-type) coll)))))

(defn read-transit [dir file-name file-type]
  (let [suffix {:json ".json" :json-verbose ".verbose.json" :msgpack ".mp"}]
    (with-open [in (io/input-stream (str dir "/" file-name (file-type suffix)))]
      (t/read (t/reader in file-type)))))

(write-transit dir "test" :json c)
;=> nil

(read-transit dir "test" :json)
;=> [{:id 12 :name "John"}]