Parsing JSON from URL

First you need to download the URL (as text):

private static String readUrl(String urlString) throws Exception {
    BufferedReader reader = null;
    try {
        URL url = new URL(urlString);
        reader = new BufferedReader(new InputStreamReader(url.openStream()));
        StringBuffer buffer = new StringBuffer();
        int read;
        char[] chars = new char[1024];
        while ((read = reader.read(chars)) != -1)
            buffer.append(chars, 0, read); 

        return buffer.toString();
    } finally {
        if (reader != null)
            reader.close();
    }
}

Then you need to parse it (and here you have some options).

• GSON (full example):

  static class Item {
      String title;
      String link;
      String description;
  }
  
  static class Page {
      String title;
      String link;
      String description;
      String language;
      List<Item> items;
  }
  
  public static void main(String[] args) throws Exception {
  
      String json = readUrl("http://www.javascriptkit.com/"
                            + "dhtmltutors/javascriptkit.json");
  
      Gson gson = new Gson();        
      Page page = gson.fromJson(json, Page.class);
  
      System.out.println(page.title);
      for (Item item : page.items)
          System.out.println("    " + item.title);
  }
  

  Outputs:

  javascriptkit.com
      Document Text Resizer
      JavaScript Reference- Keyboard/ Mouse Buttons Events
      Dynamically loading an external JavaScript or CSS file
  

• Try the java API from json.org:

  try {
      JSONObject json = new JSONObject(readUrl("..."));
  
      String title = (String) json.get("title");
      ...
  
  } catch (JSONException e) {
      e.printStackTrace();
  }