REST and JSON - converting string to JSON array

Question

I\'m new to JSON and REST. I\'m working with a server that returns strings like these:

[{\"username\":\"Hello\",\"email\":\"hello@email.com\",\"credits\":\"1         


        

Answer 1

• use GSON to format the string as JsonArray
• then traverse the JsonArray to get the values

the code sample

String json = "[{\"username\":\"Hello\",\"email\":\"hello@email.com\",\"credits\":\"100\",\"twitter_username\":\"\"},{\"username\":\"Goodbye\",\"email\":\"goodbye@email.com\",\"credits\":\"0\",\"twitter_username\":\"\"}]";
JsonArray jArray = new JsonParser().parse(json).getAsJsonArray();
for (int i=0;i<jArray.size();i++) {
    JsonObject jsonObject = jArray.get(i).getAsJsonObject();
    System.out.println(jsonObject.get("username"));
    System.out.println(jsonObject.get("email"));
    System.out.println(jsonObject.get("credits"));
    System.out.println(jsonObject.get("twitter_username"));
    System.out.println("*********");
}

Answer 2

I have used org.json.simple.JSONObject and org.json.simple.JSONArray, and I hope net.sf.json.JSONArray also work same.

You should put following string format for output (JSONArray array = new JSONArray(output); )

 {"YOUR_ARRAY_NAME": [{"username":"Hello","email":"hello@email.com","credits":"100","twitter_username":""},{"username":"Goodbye","email":"goodbye@email.com","credits":"0","twitter_username":""}]}

Now this is String representation of JSONArray.

Answer 3

I am using gson library to manipulate json. You can download gson from here. It is a very good library to handle json. Create json parser first, it will parse the json string:

JsonParser parser = new JsonParser();

now initialize an empty json array

JsonArray jArray = new JsonArray();

Now use the parser to create json array

jArray = parser.parse(outputString).getAsJsonArray();