I am not getting jsonArray in java?

Question

I am trying to get the json data from properties file in java.

emailServer.properties

{ 
   "Servers":
   [ 
      { 
         "Name":"Server1",
         "UserName":"[email protected]",
         "Password":"something",
         "Port":"993",
         "FolderName":"Server1"
      },
      { 
         "Name":"Server2",
         "UserName":"[email protected]",
         "Password":"something",
         "Port":"993",
         "FolderName":"Server2"
      }
   ]
}

When i am trying to get servers array it is showing The method getJSONArray(String) is undefined for the type JSONObject. How to solve this? Here is my java code :-

public void configure()
    {
        JSONParser parser = new JSONParser();
        try
        {
            String propertyFileName = "emailServer.properties";
            InputStream inputStream = getClass().getClassLoader().getResourceAsStream(propertyFileName);

            JSONObject jsonObject = (JSONObject) parser.parse(new InputStreamReader(inputStream, "StandardCharsets.UTF_8"));
            System.out.println(jsonObject);
            JSONArray jadata = jsonObject.getJSONArray("Servers");
            System.out.println(jadata);

        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
}

server.properties != emailServer.properties

Scary Wombat
– Scary Wombat

2019-09-18 06:22:38 +00:00
Commented Sep 18, 2019 at 6:22 — Scary Wombat
– Scary Wombat, Commented Sep 18, 2019 at 6:22
Sorry man, I mispelled the properties file.

Rockers
– Rockers

2019-09-18 06:27:28 +00:00
Commented Sep 18, 2019 at 6:27 — Rockers
– Rockers, Commented Sep 18, 2019 at 6:27
which json parser are you using?

Kris
– Kris

2019-09-18 06:27:36 +00:00
Commented Sep 18, 2019 at 6:27 — Kris
– Kris, Commented Sep 18, 2019 at 6:27
Are you importing the right JSONObject class?

Joakim Danielson
– Joakim Danielson

2019-09-18 06:30:12 +00:00
Commented Sep 18, 2019 at 6:30 — Joakim Danielson
– Joakim Danielson, Commented Sep 18, 2019 at 6:30
org.json.simple.parser.JSONParser

Rockers
– Rockers

2019-09-18 06:30:15 +00:00
Commented Sep 18, 2019 at 6:30 — Rockers
– Rockers, Commented Sep 18, 2019 at 6:30

Kris · Accepted Answer · 2019-09-18 06:52:31Z

2

Instead of using
jsonObject.getJSONArray("Servers"), you can use

JSONArray jadata =(JSONArray)jsonObject.get("Servers")

which may can solve your problem or if you still getting the issues then you can use google json library like Gson which you can find on maven and use below line:

yourjsonPojo[] data = gson.fromJson(jsonString, yourjsonPojo[].class);

edited Sep 18, 2019 at 6:52

Kris

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answered Sep 18, 2019 at 6:29

VISHAL AGGARWAL

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3 Comments

Rockers Over a year ago

Thanks man, Now i am getting. But there comes another issue, i am not getting the server1 and server2 details. int len = jadata.size(); for(int i=0; i<len; i++) { JSONArray jobject = (JSONArray)jsonObject.get("UserName"); System.out.println(jobject); }

VISHAL AGGARWAL Over a year ago

Now again, your json array contain json objects so, you need to iterate over it to get Server1 and Server2 like this for (int i = 0; i <jadata.length(); i++) { JSONObject obj= jsonArray.get(i); String videoId=obj.get("server1"); }

Vijay Over a year ago

Im getting exception like java.util.ArrayList can't cast to org.json.simple.JSONArray.. Please could you help me? why I'm getting this error.

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