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POHow to gather data from a JSON URL and display it
 

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  1. POHow to gather data from a JSON URL and display it
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    <p>I am trying to write an automated Java test where the code will go to a specified URL, read the JSON data and print it up. Here is the JSON I am trying to access;</p> <pre><code>{ "status": "success", "records": [ { "timestamp": 1381222871868, "deviceId": "288", "temperature": 17 }, { "timestamp": 1381222901868, "deviceId": "288", "temperature": 17 }, { "timestamp": 1381222931868, "deviceId": "288", "temperature": 17 }, ]} </code></pre> <p>As you can see I only have 3 elements, Timestamp, DeviceId and Temperature.</p> <p>What I am ultimately aiming for it to be able to get 2 Timestamp values and take one value away from the other, if that is possible.</p> <p>Anyway I have been trying to do this all day and am having no luck whatsoever. I was recommended to use Gson and I have included the jar files into my classpath.</p> <p>If anyone knows anything or can help me in any way it would be much appreciated as I have exhausted Google and myself trying to work this out.</p> <p>Here is the code I have to display the full list, but I do not fully understand it and so far can't manipulate it to my advantage;</p> <pre><code>public static void main(String[] args) throws Exception { String jsonString = callURL("http://localhost:8000/eem/api/v1/metrics/temperature/288"); System.out.println("\n\njsonString: " + jsonString); // Replace this try catch block for all below subsequent examples /*try { JSONArray jsonArray = new JSONArray(jsonString); System.out.println("\n\njsonArray: " + jsonArray); } catch (JSONException e) { e.printStackTrace(); }*/ try { JSONArray jsonArray = new JSONArray(jsonString); int count = jsonArray.length(); // get totalCount of all jsonObjects for(int i=0 ; i&lt; count; i++) { // iterate through jsonArray JSONObject jsonObject = jsonArray.getJSONObject(i); // get jsonObject @ i position System.out.println("jsonObject " + i + ": " + jsonObject); } } catch (JSONException e) { e.printStackTrace(); } } public static String callURL(String myURL) { //System.out.println("Requested URL:" + myURL); StringBuilder sb = new StringBuilder(); URLConnection urlConn = null; InputStreamReader in = null; try { URL url = new URL(myURL); urlConn = url.openConnection(); if (urlConn != null) { urlConn.setReadTimeout(60 * 1000); } if (urlConn != null &amp;&amp; urlConn.getInputStream() != null) { in = new InputStreamReader(urlConn.getInputStream(), Charset.defaultCharset()); BufferedReader bufferedReader = new BufferedReader(in); if (bufferedReader != null) { int cp; while ((cp = bufferedReader.read()) != -1) { sb.append((char) cp); } bufferedReader.close(); } } in.close(); } catch (Exception e) { throw new RuntimeException("Exception while calling URL:"+ myURL, e); } return sb.toString(); } </code></pre> <p>Cheers</p>
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    1. COI doubt you've exhausted Google :). Start by showing us your attempt and why it didn't work.
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      1. USSotirios Delimanolis
    2. COha all the links have already been opened!
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      1. USDan
    3. COhave you looked into the GSON's fromJson ?
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      1. USBalaji Krishnan
 

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