CODEWITHSUNDEEP
javajson
B.minnick
B.minnick

Reputation: 75

Parsing JSON response(includes a list) in java

I did a http client and I'm getting a response. I am using a JSONObject to parse the data and when I execute the code below it prints out all of the JSON just fine

HttpResponse response = httpclient.execute(httppost);
        HttpEntity entity = response.getEntity();
        if(entity!=null){
            try(InputStream instream = entity.getContent()) {
                String responseString = readInputStream(instream);
                JSONObject job = new JSONObject(responseString);
                statusLabel.setText("Command Result: " + job.toString());

Here is the readInputSream function:

static private String readInputStream(InputStream inputStream) throws IOException {
    BufferedReader reader = new BufferedReader(new InputStreamReader(
            inputStream, "UTF-8"));
    String tmp;
    StringBuilder sb = new StringBuilder();
    while ((tmp = reader.readLine()) != null) {
        sb.append(tmp).append("\n");
    }
    if (sb.length() > 0 && sb.charAt(sb.length() - 1) == '\n') {
        sb.setLength(sb.length() - 1);
    }
    reader.close();
    return sb.toString();
}

If I change it from job.toString() to:

statusLabel.setText("Command Result: " + job.get("result"));

it prints a 1 which is correct, it works all the way up to my_list. I'm not sure how to parse the list. I put a snippet of the response below. Ive tried "my_list", "my_list[]", my_list[0]" which none have worked. I get JSONObject "blank" not found 

{"result":1,  "ver":1,"total":2,"catch":true,"my_list":[{"id":3,"mid":0,"format":3,"user":4,"property":1,"type":0,"title":"hello","start":146,"end":1464,"hid":3,"bid":1,"reason":1,"time":0,"creator":"1","hello":0,"my":0,"year":"0","ggg":614,"name":"","ch":"0","attr":0,"type":1,"vtype":1,"tm_log": {"fr":4,"action":0,"vr":"82","started":1,"av_ended":2,"tr":1}}

Upvotes: 0

Views: 706

Answers (2)

Michael Gantman
Michael Gantman

Reputation: 7808

Assuming that you are using json parser project JSON-java to parse your JSON you need to retrieve a JSONArray instance - this is how arrays are storred in JSONObject. so do the following: JSONArray my_list = job.getJSONArray("my_list"); and then use methods of JSONArray class to access your array. The Javadoc to JSON-java package can be found here: http://stleary.github.io/JSON-java/index.html. Also note that JSON-java is very simple and easy to use JSON parser project but it is not very efficient for any serious project. Common recommendation for commercial use is Jackson JSON Processor which is one of the fastest and powerful JSON parsers. Here are some links to read about it: https://github.com/FasterXML/jackson, http://wiki.fasterxml.com/JacksonHome

Upvotes: 1

The Head Rush
The Head Rush

Reputation: 3356

The element you trying to retrieve is parsed into a JSONArray, not a JSONObject. Try:

JSONArray my_list = job.getJSONArray("my_list");

Upvotes: 2

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