如何在控制器中将JSON格式的Java字符串转换为JSON对象

Question

All examples of converting string to json are of javascript. mine is java class. So, i have a simple java string but formated in json. now i have recieved that from jquery post. now i have to convert that string into json object so that i can access the specific fields.

controller class

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
    public void storeData(@RequestParam(value = "temp_str", required = false) String j_str, HttpServletRequest request) {


               // do the conversion and extraction of data from "j_str"


            }

j_str variable is recieveing this string

{"temp_data":[{"temp_email":"roykumarsuraj@gmail.com","temp_pwd":"abc123"}]}

Answer 1

http://www.javacreed.com/simple-gson-example/

Gson gson = new GsonBuilder().create();
            Person p = gson.fromJson("your json string", Person.class);
            System.out.println(p);

you can use that libary to manage json objectos its very cool the Person.class is a java bean must have all properties you have in your string

Answer 2

If your Json string is extremely simple, you can just use:

JSONObject jobj=new JSONObject(j_str);

Now you can access the JSON elements by:

JSONArray jarr=jobj.getJSONArray('temp_data');
JSONObject jarr1=jarr.get(0);  // will contain {"temp_email":"roykumarsuraj@gmail.com","temp_pwd":"abc123"}

Now you can further access jarr1 similar to jobj.