Parsing JSON string in Java

Question

I am trying to parse a JSON string in java to have the individual value printed separately  But while making the program run I get the following error-  Exception in thread  main  java lang RuntimeException  Stub         at org json JSONObject  lt init gt  JSONObject java 7         at ShowActivity main ShowActivity java 29    My Class looks like-   import org json JSONException  import org json JSONObject   public class ShowActivity      private final static String  jString                    geodata                                                  id      1                              name      Julie Sherman                                               gender       female                              latitude       37 33774833333334                              longitude       -121 88670166666667                                                                                                       id      2                              name      Johnny Depp                                       gender       male                              latitude       37 336453                              longitude       -121 884985                                                                                        private static JSONObject jObject   null      public static void main String   args  throws JSONException          jObject   new JSONObject jString          JSONObject geoObject   jObject getJSONObject  geodata            String geoId   geoObject getString  id               System out println geoId           String name   geoObject getString  name           System out println name           String gender geoObject getString  gender           System out println gender           String lat geoObject getString  latitude           System out println lat           String longit  geoObject getString  longitude           System out println longit                               Let me know what is it I am missing  or the reason why I do get that error everytime I run the application  Any comments would be appreciated

User · Answer

Firstly there is an extra   after every array object   Secondly  geodata  is a JSONArray  So instead of JSONObject geoObject   jObject getJSONObject  geodata    you have to get it as JSONArray geoObject   jObject getJSONArray  geodata     Once you have the JSONArray you can fetch each entry in the JSONArray using geoObject get  lt index gt     I am using org codehaus jettison json

User · Answer

Looks like for both of your objects  inside the array   you have an extra closing brace after  Longitude

User · Answer

To convert your JSON string to hashmap you can make use of this     HashMap lt String  Object gt  hashMap   new HashMap lt  gt  Utility jsonToMap response       Use this class     handles even lists   nested lists and json   public class Utility        public static Map lt String  Object gt  jsonToMap Object json  throws JSONException            if json instanceof JSONObject              return  jsonToMap   JSONObject json             else if  json instanceof String                        JSONObject jsonObject   new JSONObject  String json                return  jsonToMap  jsonObject                      return null              private static Map lt String  Object gt   jsonToMap  JSONObject json  throws JSONException           Map lt String  Object gt  retMap   new HashMap lt String  Object gt              if json    JSONObject NULL                retMap   toMap json                     return retMap              private static Map lt String  Object gt  toMap JSONObject object  throws JSONException           Map lt String  Object gt  map   new HashMap lt String  Object gt              Iterator lt String gt  keysItr   object keys            while keysItr hasNext                  String key   keysItr next                Object value   object get key                if value instanceof JSONArray                    value   toList  JSONArray  value                              else if value instanceof JSONObject                    value   toMap  JSONObject  value                             map put key  value                     return map              public static List lt Object gt  toList JSONArray array  throws JSONException           List lt Object gt  list   new ArrayList lt Object gt             for int i   0  i  lt  array length    i                  Object value   array get i               if value instanceof JSONArray                    value   toList  JSONArray  value                              else if value instanceof JSONObject                    value   toMap  JSONObject  value                             list add value                     return list

User · Answer

Here is the example of one Object  For your case you have to use JSONArray    public static final String JSON STRING     employee      name     Sachin     salary   56000       try       JSONObject emp  new JSONObject JSON STRING   getJSONObject  employee         String empname emp getString  name         int empsalary emp getInt  salary          String str  Employee Name   empname   n   Employee Salary   empsalary       textView1 setText str       catch  Exception e   e printStackTrace            Do when JSON has problem      I don t have time but tried to give an idea  If you still can t do it  then  I will help

User · Answer

you have an extra     in each object  you may write the json string like this   public class ShowActivity          private final static String  jString                     geodata                                                    id      1                               name      Julie Sherman                                                gender       female                               latitude       37 33774833333334                               longitude       -121 88670166666667                                                                                                           id      2                               name      Johnny Depp                                        gender       male                               latitude       37 336453                               longitude       -121 884985

User · Answer

See my comment  You need to include the full org json library when running as android jar only contains stubs to compile against   In addition  you must remove the two instances of extra   in your JSON data following longitude      private final static String JSON DATA                       geodata                                    id      1                    name      Julie Sherman                                     gender       female                    latitude       37 33774833333334                    longitude       -121 88670166666667                                               id      2                    name      Johnny Depp                             gender       male                    latitude       37 336453                    longitude       -121 884985                                           Apart from that  geodata is in fact not a JSONObject but a JSONArray   Here is the fully working and tested corrected code   import org json JSONArray  import org json JSONException  import org json JSONObject   public class ShowActivity       private final static String JSON DATA                       geodata                                    id      1                    name      Julie Sherman                                     gender       female                    latitude       37 33774833333334                    longitude       -121 88670166666667                                               id      2                    name      Johnny Depp                             gender       male                    latitude       37 336453                    longitude       -121 884985                                            public static void main final String   argv  throws JSONException       final JSONObject obj   new JSONObject JSON DATA       final JSONArray geodata   obj getJSONArray  geodata        final int n   geodata length        for  int i   0  i  lt  n    i          final JSONObject person   geodata getJSONObject i         System out println person getInt  id           System out println person getString  name           System out println person getString  gender           System out println person getDouble  latitude           System out println person getDouble  longitude                   Here s the output   C  dev scrap gt java -cp json jar   ShowActivity 1 Julie Sherman female 37 33774833333334 -121 88670166666667 2 Johnny Depp male 37 336453 -121 884985

User · Answer

Correct me if i m wrong  but json is just text seperated by      so just use   String line         stores the text to parse   StringTokenizer st   new StringTokenizer line        String input1   st nextToken      keep using st nextToken   until you re out of data  Make sure to use  st hasNextToken    so you don t get a null exception

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