Convert a JSON string to object in Java ME?

Question

I used a few of them and my favorite is,

http://code.google.com/p/json-simple/

The library is very small so it's perfect for J2ME.

You can parse JSON into Java object in one line like this,

JSONObject json = (JSONObject)new JSONParser().parse("{\"name\":\"MyNode\", \"width\":200, \"height\":100}");
System.out.println("name=" + json.get("name"));
System.out.println("width=" + json.get("width"));

The simplest option is Jackson:

MyObject ob = new ObjectMapper().readValue(jsonString, MyObject.class);

There are other similarly simple to use libraries (Gson was already mentioned); but some choices are more laborious, like original org.json library, which requires you to create intermediate "JSONObject" even if you have no need for those.

GSON is a good option to convert java object to json object and vise versa.
It is a tool provided by google.

for converting json to java object use: fromJson(jsonObject,javaclassname.class)
for converting java object to json object use: toJson(javaObject)
and rest will be done automatically

For more information and for download

You can do this easily with Google GSON.

Let's say you have a class called User with the fields user, width, and height and you want to convert the following json string to the User object.

{"name":"MyNode", "width":200, "height":100}

You can easily do so, without having to cast (keeping nimcap's comment in mind ;) ), with the following code:

Gson gson = new Gson(); 
final User user = gson.fromJson(jsonString, User.class);

Where jsonString is the above JSON String.

For more information, please look into https://code.google.com/p/google-gson/