Retrieving values from nested JSON Object

Question

I ve got JSON file  which I want to parse  The JSON file   myfile   has format as follows          LanguageLevels              1    Poczatkujacy            2    SrednioZaawansowany            3    Zaawansowany            4    Ekspert            I want to retrieve value  SrednioZaawansowany  of Key 2 from Language Levels   import java io FileNotFoundException  import java io FileReader  import java io IOException  import java util Iterator  import org json simple JSONArray  import org json simple JSONObject  import org json simple parser JSONParser  import org json simple parser ParseException   public class JsonSimpleExample   public static void main String   args     JSONParser parser   new JSONParser     try        Object obj   parser parse new FileReader  myfile         JSONObject jsonObject    JSONObject  obj      JSONObject jsonChildObject    JSONObject jsonObject get  LanguageLevels      What to do next  How I can iterate over it

User · Accepted Answer

Maybe you re not using the latest version of a JSON for Java Library   json-simple has not been updated for a long time  while JSON-Java was updated 2 month ago    JSON-Java can be found on GitHub  here is the link to its repo  https   github com douglascrockford JSON-java  After switching the library  you can refer to my sample code down below   public static void main String   args        String JSON       LanguageLevels      1     Pocz  u0105tkuj  u0105cy     2       u015arednioZaawansowany     3     Zaawansowany     4     Ekspert     n        JSONObject jsonObject   new JSONObject JSON       JSONObject getSth   jsonObject getJSONObject  LanguageLevels        Object level   getSth get  2         System out println level       And as JSON-Java open-sourced  you can read the code and its document  they will guide you through   Hope that it helps

User · Answer

Try this  you can parse nested JSON public static String getJsonValue String jsonReq  String key            JSONObject json   new JSONObject jsonReq           boolean exists   json has key           Iterator lt   gt  keys          String nextKeys          String val    quot  quot           if   exists                keys   json keys                while  keys hasNext                      nextKeys    String  keys next                    try                       if  json get nextKeys  instanceof JSONObject                            return getJsonValue json getJSONObject nextKeys  toString    key                         else if  json get nextKeys  instanceof JSONArray                            JSONArray jsonArray   json getJSONArray nextKeys                           int i   0                          if  i  lt  jsonArray length    do                               String jsonArrayString   jsonArray get i  toString                                JSONObject innerJson   new JSONObject jsonArrayString                               return getJsonValue innerJson toString   key                             while  i  lt  jsonArray length                                             catch  Exception e                        e printStackTrace                                              else               val   json get key  toString                      return val

User · Answer

JSONArray jsonChildArray    JSONArray  jsonChildArray get  LanguageLevels        JSONObject secObject    JSONObject  jsonChildArray get 1     I think this should work  but i do not have the possibility to test it at the moment

User · Answer

You will have to iterate step by step into nested JSON   for e g a JSON received from Google geocoding api        results                        address components                                    long name     Bhopal                   short name     Bhopal                   types       locality    political                                                 long name     Bhopal                   short name     Bhopal                   types       administrative area level 2    political                                                 long name     Madhya Pradesh                   short name     MP                   types       administrative area level 1    political                                                 long name     India                   short name     IN                   types       country    political                                        formatted address     Bhopal  Madhya Pradesh  India             geometry                   bounds                      northeast                         lat    23 3326697                     lng    77 5748062                                   southwest                         lat    23 0661497                     lng    77 2369767                                              location                      lat    23 2599333                  lng    77 412615                             location type     APPROXIMATE                viewport                      northeast                         lat    23 3326697                     lng    77 5748062                                   southwest                         lat    23 0661497                     lng    77 2369767                                                      place id     ChIJvY Wj49CfDkR-NRy1RZXFQI             types       locality    political                      status     OK      I shall iterate in below given fashion to  location                          lat    23 2599333                      lng    77 412615    recieve JSON in json object           JSONObject json   new JSONObject output toString             JSONArray result   json getJSONArray  results            JSONObject result1   result getJSONObject 0           JSONObject geometry   result1 getJSONObject  geometry            JSONObject locat   geometry getJSONObject  location                iterate onto level of location            double lat   locat getDouble  lat            double lng   locat getDouble  lng

User · Answer

To see all keys of Jsonobject use this      String JSON       LanguageLevels      1     Pocz  u0105tkuj  u0105cy     2       u015arednioZaawansowany     3     Zaawansowany     4     Ekspert     n       JSONObject obj   new JSONObject JSON       Iterator iterator   obj keys        String key   null      while  iterator hasNext              key    String  iterator next            System out pritnln key

User · Answer

You can see that JSONObject extends a HashMap  so you can simply use it as a HashMap   JSONObject jsonChildObject    JSONObject jsonObject get  LanguageLevels    for  Map Entry in jsonChildOBject entrySet          System out println  Key       entry getKey        Value       entry getValue

[java] Retrieving values from nested JSON Object

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