I am converting InputStream to JSONObject using following code. My question is, is there any simple way to convert InputStream to JSONObject. Without doing InputStream -> BufferedReader -> StringBuilder -> loop -> JSONObject.toString().
InputStream inputStreamObject = PositionKeeperRequestTest.class.getResourceAsStream(jsonFileName);
BufferedReader streamReader = new BufferedReader(new InputStreamReader(inputStreamObject, "UTF-8"));
StringBuilder responseStrBuilder = new StringBuilder();
String inputStr;
while ((inputStr = streamReader.readLine()) != null)
responseStrBuilder.append(inputStr);
JSONObject jsonObject = new JSONObject(responseStrBuilder.toString());
This question is related to
java
android
json
inputstream
Since you're already using Google's Json-Simple
library, you can parse the json from an InputStream
like this:
InputStream inputStream = ... //Read from a file, or a HttpRequest, or whatever.
JSONParser jsonParser = new JSONParser();
JSONObject jsonObject = (JSONObject)jsonParser.parse(
new InputStreamReader(inputStream, "UTF-8"));
If you don't want to mess with ready libraries you can just make a class like this.
public class JsonConverter {
//Your class here, or you can define it in the constructor
Class requestclass = PositionKeeperRequestTest.class;
//Filename
String jsonFileName;
//constructor
public myJson(String jsonFileName){
this.jsonFileName = jsonFileName;
}
//Returns a json object from an input stream
private JSONObject getJsonObject(){
//Create input stream
InputStream inputStreamObject = getRequestclass().getResourceAsStream(jsonFileName);
try {
BufferedReader streamReader = new BufferedReader(new InputStreamReader(inputStreamObject, "UTF-8"));
StringBuilder responseStrBuilder = new StringBuilder();
String inputStr;
while ((inputStr = streamReader.readLine()) != null)
responseStrBuilder.append(inputStr);
JSONObject jsonObject = new JSONObject(responseStrBuilder.toString());
//returns the json object
return jsonObject;
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
//if something went wrong, return null
return null;
}
private Class getRequestclass(){
return requestclass;
}
}
Then, you can use it like this:
JSONObject jObject = new JsonConverter(FILE_NAME).getJsonObject();
This code works
BufferedReader bR = new BufferedReader( new InputStreamReader(inputStream));
String line = "";
StringBuilder responseStrBuilder = new StringBuilder();
while((line = bR.readLine()) != null){
responseStrBuilder.append(line);
}
inputStream.close();
JSONObject result= new JSONObject(responseStrBuilder.toString());
Another solution: use flexjson.jar: http://mvnrepository.com/artifact/net.sf.flexjson/flexjson/3.2
List<yourEntity> yourEntityList = deserializer.deserialize(new InputStreamReader(input));
Here is a solution that doesn't use a loop and uses the Android API only:
InputStream inputStreamObject = PositionKeeperRequestTest.class.getResourceAsStream(jsonFileName);
byte[] data = new byte[inputStreamObject.available()];
if(inputStreamObject.read(data) == data.length) {
JSONObject jsonObject = new JSONObject(new String(data));
}
use JsonReader in order to parse the InputStream. See example inside the API: http://developer.android.com/reference/android/util/JsonReader.html
This worked for me:
JSONArray jsonarr = (JSONArray) new JSONParser().parse(new InputStreamReader(Nameofclass.class.getResourceAsStream(pathToJSONFile)));
JSONObject jsonobj = (JSONObject) new JSONParser().parse(new InputStreamReader(Nameofclass.class.getResourceAsStream(pathToJSONFile)));
InputStream inputStreamObject = PositionKeeperRequestTest.class.getResourceAsStream(jsonFileName);
JSONObject jsonObject = new JSONObject(IOUtils.toString(inputStreamObject));
Simple Solution:
JsonElement element = new JsonParser().parse(new InputStreamReader(inputStream));
JSONObject jsonObject = new JSONObject(element.getAsJsonObject().toString());
You can use this api https://code.google.com/p/google-gson/
It's simple and very useful,
Here's how to use the https://code.google.com/p/google-gson/ Api to resolve your problem
public class Test {
public static void main(String... strings) throws FileNotFoundException {
Reader reader = new FileReader(new File("<fullPath>/json.js"));
JsonElement elem = new JsonParser().parse(reader);
Gson gson = new GsonBuilder().create();
TestObject o = gson.fromJson(elem, TestObject.class);
System.out.println(o);
}
}
class TestObject{
public String fName;
public String lName;
public String toString() {
return fName +" "+lName;
}
}
json.js file content :
{"fName":"Mohamed",
"lName":"Ali"
}
you could use an Entity:
FileEntity entity = new FileEntity(jsonFile, "application/json");
String jsonString = EntityUtils.toString(entity)
The best solution in my opinion is to encapsulate the InputStream in a JSONTokener object. Something like this:
JSONObject jsonObject = new JSONObject(new JSONTokener(inputStream));
Make use of Jackson JSON Parser
ObjectMapper mapper = new ObjectMapper();
Map<String,Object> map = mapper.readValue(inputStreamObject,Map.class);
If you want specifically a JSONObject then you can convert the map
JSONObject json = new JSONObject(map);
Refer this for the usage of JSONObject constructor http://stleary.github.io/JSON-java/index.html
Source: Stackoverflow.com