Convertir une chaîne en un tableau JSON

Ici, vous obtenez JSONObject afin de changer

 JSONArray jsonArray = new JSONArray(readlocationFeed); 

ligne avec suite

 JSONObject jsnobject = new JSONObject(readlocationFeed); 

et après

 JSONArray jsonArray = jsnobject.getJSONArray("locations"); for (int i = 0; i < jsonArray.length(); i++) { JSONObject explrObject = jsonArray.getJSONObject(i); } 

Chaîne d’entrée

 [ { "userName": "sandeep", "age": 30 }, { "userName": "vivan", "age": 5 } ] 

Un moyen simple de convertir une chaîne en JSON

 public class Test { public static void main(Ssortingng[] args) throws JSONException { Ssortingng data = "[{\"userName\": \"sandeep\",\"age\":30},{\"userName\": \"vivan\",\"age\":5}] "; JSONArray jsonArr = new JSONArray(data); for (int i = 0; i < jsonArr.length(); i++) { JSONObject jsonObj = jsonArr.getJSONObject(i); System.out.println(jsonObj); } } } 

Sortie

 {"userName":"sandeep","age":30} {"userName":"vivan","age":5} 

Utiliser json lib: –

 Ssortingng data="[{"A":"a","B":"b","C":"c","D":"d","E":"e","F":"f","G":"g"}]"; Object object=null; JSONArray arrayObj=null; JSONParser jsonParser=new JSONParser(); object=jsonParser.parse(data); arrayObj=(JSONArray) object; System.out.println("Json object :: "+arrayObj); 

En utilisant la librairie GSON: –

 Gson gson = new Gson(); Ssortingng data="[{\"A\":\"a\",\"B\":\"b\",\"C\":\"c\",\"D\":\"d\",\"E\":\"e\",\"F\":\"f\",\"G\":\"g\"}]"; JsonParser jsonParser = new JsonParser(); JsonArray jsonArray = (JsonArray) jsonParser.parse(data); 

vous devrez convertir la chaîne donnée en JSONObject au lieu de JSONArray car la chaîne actuelle contient JsonObject tant qu’élément racine au lieu de JsonArray :

 JSONObject jsonObject = new JSONObject(readlocationFeed); 

 try { Log.e("log_tag", "Error in convert Ssortingng" + result.toSsortingng()); JSONObject json_data = new JSONObject(result); Ssortingng status = json_data.getSsortingng("Status"); { Ssortingng data = json_data.getSsortingng("locations"); JSONArray json_data1 = new JSONArray(data); for (int i = 0; i < json_data1.length(); i++) { json_data = json_data1.getJSONObject(i); String lat= json_data.getString("lat"); String lng= json_data.getString("long"); } } 

 Ssortingng b = "[" + readlocationFeed + "]"; JSONArray jsonArray1 = new JSONArray(b); jsonarray_length1 = jsonArray1.length(); for (int i = 0; i < jsonarray_length1; i++) { } 

ou le convertir en JSONOBJECT

 JSONObject jsonobj = new JSONObject(readlocationFeed); JSONArray jsonArray = jsonobj.getJSONArray("locations"); 

si la réponse est comme ça

 "GetDataResult": "[{\"UserID\":1,\"DeviceID\":\"d1254\",\"MobileNO\":\"056688\",\"Pak1\":true,\"pak2\":true,\"pak3\":false,\"pak4\":true,\"pak5\":true,\"pak6\":false,\"pak7\":false,\"pak8\":true,\"pak9\":false,\"pak10\":true,\"pak11\":false,\"pak12\":false}]" 

vous pouvez parsingr comme ça

 JSONObject jobj=new JSONObject(response); Ssortingng c = jobj.getSsortingng("GetDataResult"); JSONArray jArray = new JSONArray(c); deviceId=jArray.getJSONObject(0).getSsortingng("DeviceID"); 

ici la taille de JsonArray est 1. Sinon, vous devez utiliser pour la boucle pour obtenir des valeurs.

Vous pouvez effectuer les opérations suivantes:

 JSONArray jsonArray = jsnobject.getJSONArray("locations"); for (int i = 0; i < jsonArray.length(); i++) { JSONObject explrObject = jsonArray.getJSONObject(i); } 

Si JSON suivant de service Web, Json Array comme réponse:

  [3] 0: { id: 2 name: "a561137" password: "test" firstName: "abhishek" lastName: "ringsia" organization: "bbb" }- 1: { id: 3 name: "a561023" password: "hello" firstName: "hello" lastName: "hello" organization: "hello" }- 2: { id: 4 name: "a541234" password: "hello" firstName: "hello" lastName: "hello" organization: "hello" } 

Pour l’accepter d’abord en tant que tableau Json, alors en lisant son object, vous devez utiliser Object Mapper.readValue, car l’object Json est toujours en chaîne.

  List list = new ArrayList(); JSONArray jsonArr = new JSONArray(response); for (int i = 0; i < jsonArr.length(); i++) { JSONObject jsonObj = jsonArr.getJSONObject(i); ObjectMapper mapper = new ObjectMapper(); User usr = mapper.readValue(jsonObj.toString(), User.class); list.add(usr); } 

mapper.read est la fonction correcte, si vous utilisez mapper.convert (param, param). Cela vous donnera une erreur.

 //A very simple way to convert import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import com.google.gson.Gson; import com.google.gson.JsonArray; import com.google.gson.JsonElement; import com.google.gson.JsonParser; class Usuario { private Ssortingng username; private Ssortingng email; private Integer credits; private Ssortingng twitter_username; public Ssortingng getUsername() { return username; } public void setUsername(Ssortingng username) { this.username = username; } public Ssortingng getEmail() { return email; } public void setEmail(Ssortingng email) { this.email = email; } public Integer getCredits() { return credits; } public void setCredits(Integer credits) { this.credits = credits; } public Ssortingng getTwitter_username() { return twitter_username; } public void setTwitter_username(Ssortingng twitter_username) { this.twitter_username = twitter_username; } @Override public Ssortingng toSsortingng() { return "UserName: " + this.getUsername() + " Email: " + this.getEmail(); } 

}

 /* * put ssortingng into file jsonFileArr.json * [{"username":"Hello","email":"hello@email.com","credits" * :"100","twitter_username":""}, * {"username":"Goodbye","email":"goodbye@email.com" * ,"credits":"0","twitter_username":""}, * {"username":"mlsilva","email":"mlsilva@email.com" * ,"credits":"524","twitter_username":""}, * {"username":"fsouza","email":"fsouza@email.com" * ,"credits":"1052","twitter_username":""}] */ public class TestaGsonLista { public static void main(Ssortingng[] args) { Gson gson = new Gson(); try { BufferedReader br = new BufferedReader(new FileReader( "C:\\Temp\\jsonFileArr.json")); JsonArray jsonArray = new JsonParser().parse(br).getAsJsonArray(); for (int i = 0; i < jsonArray.size(); i++) { JsonElement str = jsonArray.get(i); Usuario obj = gson.fromJson(str, Usuario.class); System.out.println(obj); System.out.println(str); System.out.println("-------"); } } catch (IOException e) { e.printStackTrace(); } } 

}