I am using JAKSON in my Android Project. Now i have a JSON Object in String format. How can i convert this String into a JAVA POJO class.
There are several different ways to archive this:
1) Use org.json.JSONObject, mannually parse data and put it in POJO.
2) Use third party library like GSON and decode your JSON string directly to Object. GSON for example, use annotations to define serrialization/deserrialization rules for Objects/JSONs.
With Jackson:
MyThing thing = new ObjectMapper().readValue(jsonString, MyThing.class);
For an introduction to using Jackson, I recommend taking a look at http://wiki.fasterxml.com/JacksonInFiveMinutes.
ObjectMapper mapper = new ObjectMapper();
PojoClassName Obj = mapper.readValue(JsonString, PojoClassName.class);
P.S JsonString is the String which contains Json and is to be converted to POJO
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I am working on an Android project where I am using volley to parse the data from JSON. I am able to parse the data if it is an array by following this tutorial. But when I try to parse a single object using getJSONObject, it is returning null. I want to get the value of that particular object.
This is my JSON file:
In the above file I want to retrieve only responseInfo which is a JSON object.
You need to create JSONObject
JSONObject object = new JSONObject(responce);
//get responce code
String query = object.getString("responceCode");
Please use Gson library for json parsing
https://github.com/google/gson
I'm trying to convert this string :
{"status":200,"message":"OK","response":{"result":1,"time":0.29773306846619,"values":[]}}
to a Json OBJ, to be able to read values better, I read somewhere that I can use Gson library, but I don't know how.
You don't need to use GSON. Android has JSON parsing builtin. Just pass your string to the constructor.
JSONObject jObject = new JSONObject(myString);
Here are the docs for JSONObject.
I'm using com.fasterxml.jackson.databind with Retrofit to handle the response from the server in my Android app.
Since the JSONObject response is too complicated and contains lots of JSONArray, I want to be able to parse some of those array fields into String instead of creating POJO for each sub-object that those Array could contains.
Is there a way I could just tell Jackson to keep those field as String and not parse them into Entities?
I got below json response:
{
"session_id":"3c59ba77-8545-4de7-aae0-41a5s1fads19",
"user-info":{"username":"ganesh","website":null,"location":"newyork","bio":null,"ask":null,"name":"ganesh","isSelf":true}
}
how to create model class for this response:
Unable to create object name for user-info
How to parse this data using GSON?
You could create GSON parser with a FieldNamingPolicy
Gson gson = new GsonBuilder().setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_DASHES).create();
It would then convert standard Java naming convention userInfo to user-info (illegal in Java as a variable name) and vice versa.
But in your case separators are mixed (once dash, once underscore).
So there is another solution, set the name using annotation
import com.google.gson.annotations.SerializedName;
[..]
#SerializedName("user-info")
User_info userInfo;
I have this Json model and I want to parse only one object:
{"CodeMsg": "Server Local Time", "server_time": "2012-03-19 19:59:30", "CodeResult": "OK"}
How can I do that?
There are a number of libraries available to parse JSON. Two that are commonly used are:
Gson - http://code.google.com/p/google-gson/
Jackson - http://jackson.codehaus.org/
With both you do this:
Create a plain java object to represent your data - e.g. a class CodeMsg
Use the library to provide the JSON string/stream, and the type (CodeMsg) and an object of that type is created, with its members set according to the JSON (e.g. server_time, CodeResult, etc)
They are very easy to use.
var data = {"CodeMsg": "Server Local Time", "server_time": "2012-03-19 19:59:30", "CodeResult": "OK"};
JSONObject obj1 = new JSONObject(data);
and then use obj1.getJSONString('CodeMsg');