CODEWITHSUNDEEP
javaarraysjson
nmalloul
nmalloul

Reputation: 83

Create JSONObject from string

I know that this question was already asked, i tried all solutions but nothing works for me. So i have this json syntax string:

{
   tasks: [
      {
         blockId: "startpoint1",
         properties: [ "aaaa"  ]
      },
      {
         blockId: "endpoint2",
         properties: [ "tttttt" ]
      } 
   ]
}

I tried to create a JSONObject from this String by this way:

JSONParser parser=new JSONParser();
try {
    JSONObject json=(JSONObject) parser.parse(req.getParameter(WORKFLOW_DEFINITION_PROPERTIES));
    } catch (ParseException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();
    }

Now i want to loop on the tasks array to get every element blockId. I tried to do this by casting the JSONObject to JSONArray like this:

JSONArray tasks=(JSONArray) json.get("tasks");

but i still enable to loop over tasks to get the blockId's. Can you tell me what i made wrong or how to fix this?

Upvotes: 1

Views: 6647

Answers (3)

Chandrakant Thakkar
Chandrakant Thakkar

Reputation: 978

Do you need this?

    var arrayVariable=[
      {
         blockId: "startpoint1",
         properties: [ "aaaa"  ]
      },
      {
         blockId: "endpoint2",
         properties: [ "tttttt" ]
      } 
   ]

    arrayVariable.map(function(d){
       return d.blockId
       });

Out put you will get all you blockId as

     ["startpoint1", "endpoint2"]

Upvotes: -1

cralfaro
cralfaro

Reputation: 5948

Just change the way you create your JSONObject.

JSONObject jObject = new JSONObject(jsonStr);
//later you can access to your array 
JSONArray tasks=(JSONArray) jObject.get("tasks");

Upvotes: 1

Anas EL KORCHI
Anas EL KORCHI

Reputation: 2048

You have to use getJsonArray method instead of get method to retrieve the array of tasks : 

JSONArray tasks= json.getJsonArray("tasks");

Upvotes: 4

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