How do I extract value from Json

Question

I am getting a response String from server like below       name    Json      detail          first name    Json        last name    Scott        age    23          status    success      I want to get the value of First name  How can I do that  Thanks in Advance

User · Answer

Use a JSON parser  There are plenty of JSON parsers written in Java   http   www json org   Look under the Java section and find one you like

User · Answer

import java util ArrayList        import org bson Document       Document root   Document parse    n                     name      Json    n                     detail      n                       first name      Json    n                       last name      Scott    n                       age      23   n                      n                     status      success   n                           System out println   String  root get  name          System out println   String    Document  root get  detail    get  first name          System out println   String    Document  root get  detail    get  last name          System out println   String    Document  root get  detail    get  age          System out println   String  root get  status

User · Answer

Pasting my code here  this should help  It shows the package which can be used   import org json JSONException  import org json JSONObject   public class extractingJSON        public static void main String   args  throws JSONException              TODO Auto-generated method stub          String jsonStr       name     SK     arr      a     1     b     2               JSONObject jsonObj   new JSONObject jsonStr           String name   jsonObj getString  name            System out println name            String first   jsonObj getJSONObject  arr   getString  a            System out println first

User · Answer

we can use the below to get key as string from JSON OBJECT  JsonObject json   new JsonObject      json get  key   getAsString      this gives the string without double quotes     in the string

User · Answer

If you don t mind adding a dependency  you can use JsonPath   import com jayway jsonpath JsonPath   String firstName   JsonPath read rawJsonString     detail first name          specifies the root of the raw json string and then you just specify the path to the field you want   This will always return a string   You ll have to do any casting yourself   Be aware that it ll throw a PathNotFoundException at runtime if the path you specify doesn t exist

User · Answer

String jsonErrorString   HttpClientErrorException exception  getResponseBodyAsString    JSONObject jsonObj null  String errorDetails null  String status null  try           jsonObj   new JSONObject jsonErrorString           int index  jsonObj getString  detail   indexOf                       errorDetails jsonObj getString  detail   substring index                   status jsonObj getString  status                   catch  JSONException e                       TODO Auto-generated catch block                 e printStackTrace                              item put  status   status               item put  errordetailMsg   errorDetails

User · Answer

see this code what i am used in my application  String data    foo   bar   coolness  2 0   altitude  39000   pilot    firstName   Buzz   lastName   Aldrin     mission   apollo 11       I retrieved like this   JSONObject json    JSONObject  JSONSerializer toJSON data               double coolness   json getDouble   coolness         int altitude   json getInt   altitude         JSONObject pilot   json getJSONObject  pilot        String firstName   pilot getString  firstName        String lastName   pilot getString  lastName         System out println   Coolness      coolness        System out println   Altitude      altitude        System out println   Pilot      lastName

User · Answer

JSONArray ja   new JSONArray json       JSONObject ob   ja getJSONObject 0       String nh   ob getString  status              status     true                where  json  is a String and status is the key from which i will get value

[java] How do I extract value from Json

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