How to modify values of JsonObject JsonArray directly

Question

Once i have parsed a JSON String into a GSON provided JsonObject class   assume that i do not wish to parse it into any meaningful data objects  but strictly want to use JsonObject   how am i able to modify a field   value of a key directly   I don t see an API that may help me    https   static javadoc io com google code gson gson 2 6 2 com google gson JsonObject html

User · Accepted Answer

Strangely  the answer is to keep adding back the property  I was half expecting a setter method   S  System out println  Before      obj get  DebugLogId        original  02352   obj addProperty  DebugLogId    YYY     System out println  After      obj get  DebugLogId        now  YYY

User · Answer

Since 2 3 version of Gson library the JsonArray class have a  set  method   Here s an simple example   JsonArray array   new JsonArray    array add new JsonPrimitive  Red     array add new JsonPrimitive  Green     array add new JsonPrimitive  Blue      array remove 2   array set 0  new JsonPrimitive  Yelow

User · Answer

This works for modifying childkey value using JSONObject  import used is  import org json JSONObject    ex json  convert json file to string while giving as input          parentkey1    name        parentkey2           childkey    test             Code  JSONObject jObject    new JSONObject String jsoninputfileasstring   jObject getJSONObject  parentkey2   put  childkey   data1    System out println jObject     output          parentkey1    name        parentkey2           childkey    data1

User · Answer

public static JSONObject convertFileToJSON String fileName  String username  List lt String gt  list              throws FileNotFoundException  IOException  org json simple parser ParseException           JSONObject json   new JSONObject            String jsonStr   new String Files readAllBytes Paths get fileName             json   new JSONObject jsonStr           System out println json           JSONArray jsonArray   json getJSONArray  users            JSONArray finalJsonArray   new JSONArray                           Get User form setNewUser method                       finalJsonArray put setNewUserPreference             boolean has   true          for  int i   0  i  lt  jsonArray length    i                  JSONObject jsonObject   jsonArray getJSONObject i               finalJsonArray put jsonObject               String username2   jsonObject getString  userName                if  username2 equals username                     has   true                            System out println  user name  are      username2               JSONObject jsonObject2   jsonObject getJSONObject  languages                String eng   jsonObject2 getString  Eng                String fin   jsonObject2 getString  Fin                String ger   jsonObject2 getString  Ger                jsonObject2 put  Eng    ChangeEnglishValueCheckForLongValue                System out println   Eng       eng      Fin     fin      ger       ger                     System out println  Final JSON Array  n    json           jsonArray put setNewUserPreference             return json

User · Answer

It s actually all in the documentation   JSONObject and JSONArray can both be used to replace the standard data structure  To implement a setter simply call a remove String name  before a put String name  Object value    Here s an simple example   public class BasicDB    private JSONObject jData   new JSONObject   public BasicDB String username  String tagline        try           jData put  username   username           jData put  tagline    tagline         catch  JSONException e               TODO Auto-generated catch block         e printStackTrace             public String getUsername           String ret   null      try           ret   jData getString  username          catch  JSONException e           TODO Auto-generated catch block     e printStackTrace               return ret     public void setUsername  String username         try           jData remove  username            jData put  username    username         catch  JSONException e               TODO Auto-generated catch block         e printStackTrace             public String getTagline          String ret   null      try           ret   jData getString  tagline          catch  JSONException e           TODO Auto-generated catch block     e printStackTrace               return ret

User · Answer

Another approach would be to deserialize into a java util Map  and then just modify the Java Map as wanted   This separates the Java-side data handling from the data transport mechanism  JSON   which is how I prefer to organize my code  using JSON for data transport  not as a replacement data structure

[java] How to modify values of JsonObject / JsonArray directly?

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