Convert InputStream to JSONObject

Question

I am converting InputStream to JSONObject using following code  My question is  is there any simple way to convert InputStream to JSONObject  Without doing InputStream -  BufferedReader -  StringBuilder -  loop -  JSONObject toString          InputStream inputStreamObject   PositionKeeperRequestTest class getResourceAsStream jsonFileName       BufferedReader streamReader   new BufferedReader new InputStreamReader inputStreamObject   UTF-8         StringBuilder responseStrBuilder   new StringBuilder         String inputStr      while   inputStr   streamReader readLine       null          responseStrBuilder append inputStr        JSONObject jsonObject   new JSONObject responseStrBuilder toString

User · Answer

Here is a solution that doesn t use a loop and uses the Android API only   InputStream inputStreamObject   PositionKeeperRequestTest class getResourceAsStream jsonFileName   byte   data   new byte inputStreamObject available     if inputStreamObject read data     data length        JSONObject jsonObject   new JSONObject new String data

User · Answer

Make use of Jackson JSON Parser ObjectMapper mapper   new ObjectMapper    Map lt String Object gt  map   mapper readValue inputStreamObject Map class    If you want specifically a JSONObject then you can convert the map JSONObject json   new JSONObject map    Refer this for the usage of JSONObject constructor http   stleary github io JSON-java index html

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you could use an Entity   FileEntity entity   new FileEntity jsonFile   application json    String jsonString   EntityUtils toString entity

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The best solution in my opinion is to encapsulate the InputStream in a JSONTokener object  Something like this   JSONObject jsonObject   new JSONObject new JSONTokener inputStream

User · Answer

Simple Solution   JsonElement element   new JsonParser   parse new InputStreamReader inputStream    JSONObject jsonObject   new JSONObject element getAsJsonObject   toString

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This worked for me   JSONArray jsonarr    JSONArray  new JSONParser   parse new InputStreamReader Nameofclass class getResourceAsStream pathToJSONFile     JSONObject jsonobj    JSONObject  new JSONParser   parse new InputStreamReader Nameofclass class getResourceAsStream pathToJSONFile

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Another solution  use flexjson jar  http   mvnrepository com artifact net sf flexjson flexjson 3 2  List lt yourEntity gt  yourEntityList   deserializer deserialize new InputStreamReader input

User · Answer

If you don t want to mess with ready libraries you can just make a class like this   public class JsonConverter      Your class here  or you can define it in the constructor Class requestclass   PositionKeeperRequestTest class     Filename String jsonFileName     constructor public myJson String jsonFileName       this jsonFileName   jsonFileName        Returns a json object from an input stream private JSONObject getJsonObject           Create input stream     InputStream inputStreamObject   getRequestclass   getResourceAsStream jsonFileName       try          BufferedReader streamReader   new BufferedReader new InputStreamReader inputStreamObject   UTF-8            StringBuilder responseStrBuilder   new StringBuilder            String inputStr         while   inputStr   streamReader readLine       null             responseStrBuilder append inputStr           JSONObject jsonObject   new JSONObject responseStrBuilder toString               returns the json object        return jsonObject        catch  IOException e           e printStackTrace         catch  JSONException e           e printStackTrace                if something went wrong  return null     return null     private Class getRequestclass        return requestclass        Then  you can use it like this    JSONObject jObject   new JsonConverter FILE NAME  getJsonObject

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InputStream inputStreamObject   PositionKeeperRequestTest class getResourceAsStream jsonFileName   JSONObject jsonObject   new JSONObject IOUtils toString inputStreamObject

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use JsonReader in order to parse the InputStream  See example inside the API  http   developer android com reference android util JsonReader html

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Since you re already using Google s Json-Simple library  you can parse the json from an InputStream like this   InputStream inputStream         Read from a file  or a HttpRequest  or whatever  JSONParser jsonParser   new JSONParser    JSONObject jsonObject    JSONObject jsonParser parse        new InputStreamReader inputStream   UTF-8

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This code works  BufferedReader bR   new BufferedReader   new InputStreamReader inputStream    String line        StringBuilder responseStrBuilder   new StringBuilder    while  line    bR readLine       null        responseStrBuilder append line     inputStream close     JSONObject result  new JSONObject responseStrBuilder toString

User · Answer

You can use this api https   code google com p google-gson  It s simple and very useful   Here s how to use the https   code google com p google-gson  Api to resolve your problem   public class Test     public static void main String    strings  throws FileNotFoundException        Reader reader   new FileReader new File   lt fullPath gt  json js         JsonElement elem   new JsonParser   parse reader       Gson gson    new GsonBuilder   create       TestObject o   gson fromJson elem  TestObject class      System out println o            class TestObject    public String fName    public String lName    public String toString         return fName      lName           json js file content      fName   Mohamed    lName   Ali

[java] Convert InputStream to JSONObject

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