/**
  * @param args
  * @throws IOException 
  */
 public static void main(String[] args) throws IOException {
  URL url = new URL("https://www.koobe.com.tw/AssociateAPIs/Data/Quota.aspx?bookid=20ddd93c-d34e-40ce-996f-4cf3dd322d16");
  Reader reader = new InputStreamReader(new BufferedInputStream(url.openStream()));    
        int c;    
        String str = "[";
        while ((c = reader.read()) != -1) {    
         str += (char)c;    
        }
        str += "]";
        reader.close();   
        
        System.out.println(str);
        //将字符串转百json数据
        JSONArray ja = JSONArray.fromObject(str);
        JSONObject o=(JSONObject) ja.get(0);
        System.out.println(o.get("KoobeData"));

?

?

[{"KoobeData":{"Quota":3}}]
{"Quota":3}