CODEWITHSUNDEEP
javaarraysjson
RaHuL
RaHuL

Reputation: 24

[Java]: Unable to parse a JSON with no array / sub array in it

I am using the json-simple-1.1.jar and trying to get multiple (atleast 3) values from the json as shown in the code section.

My code works for a JSON with multiple arrays but not working for simple json format.

{
"Addresses": {
    "UserName": "Rahul", 
    "Status": "Active", 
    "CreateDate": "2017-01-09T11:39:31.244Z", 
    "SecretAccessKey": "ABCD-EFGH-HIJK", 
    "AccessKeyId": "1234567"
 }
}

Following is the java logic I am trying to use:

public static String[] getValuesFromJson(String filename, Object key, int exp_sizeOfArray, String[] exp_keys) throws FileNotFoundException, IOException, ParseException { 

    String valuesFromJson[] = new String[exp_keys.length]; 

    /** Create a JSONParser object*/
    JSONParser parser = new JSONParser();

    /** Read the JSON file using parser*/
    JSONObject jsonObject = (JSONObject) parser.parse(new FileReader(
            filename));

    System.out.println("JsonObject size: "+jsonObject.keySet().size());
    for (Object object : jsonObject.keySet()) {
        System.out.println(jsonObject.get(object.toString()));
    }
    /** Get the values in JSONArray using the key*/
    JSONArray jsonArray = (JSONArray) jsonObject.get(key);
    for (int i = 0; i < jsonArray.size(); i++) {

        /** Add the individual set from JSONArray to a JSONObject */
        JSONObject subJsonObject = (JSONObject) parser.parse(jsonArray.get(i).toString());

        /** Check for expected size of array */
        if(subJsonObject.size() <= exp_sizeOfArray){
            int index=0;
            /** Check for each key value in the sub-JSONObject keySet*/
            for (Object object : subJsonObject.keySet()) {

                /** Iterate until the expected key value matches with the actual value*/
                for (int j = 0; j < exp_keys.length; j++) {

                    /** Check if the expected key matches with any of the key value*/
                    if(object.toString().trim().equals(exp_keys[j].toString().trim())){
                        System.out.println("Key: '".concat(object.toString()).concat("'\tValue: '").concat(subJsonObject.get(object)+"'"));
                        valuesFromJson[index] = subJsonObject.get(exp_keys[j]).toString();
                        index++;
                        break;
                    }
                }
            } 
        }
    }

    /** Return the value of expected key*/
    return valuesFromJson;
}

I am getting error: "org.json.simple.JSONObject cannot be cast to org.json.simple.JSONArray" on below line:

JSONArray jsonArray = (JSONArray) jsonObject.get(key);

Upvotes: 0

Views: 113

Answers (2)

RaHuL
RaHuL

Reputation: 24

Voila! Done it without converting JSONObject to JSONArray

JSONObject jsonObject = (JSONObject) parser.parse(new FileReader(
            filename));
    /** Creating another JSONObject here */
    JSONObject jsonObject2 = (JSONObject) parser.parse(jsonObject.get(key).toString());
    for (Object newKey : jsonObject2.keySet()) {
        System.out.println("Key: '".concat(newKey.toString()).concat("'\tValue: '").concat(jsonObject2.get(newKey)+"'"));
    }

Thank you guys for the help!

Upvotes: 0

JiriS
JiriS

Reputation: 7550

You are trying to cast JSONObject to JSONArray, but there is no array. Rather get all object keys and iterate over it.

If you go to json.org(1) you can find there:

An array is an ordered collection of values. An array begins with [ (left bracket) and ends with ] (right bracket). Values are separated by , (comma)

Upvotes: 1

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