java - 在 Java 中检索数据

Question

我是一个java新手。是否可以从网站获取数据然后将其存储在某种数据结构中？例如，该程序在给定时间从雅虎财经获取股票的值(value)并存储它。就像我说的，我不太精通 Java，我想知道这是否可以完成。如果可以，做起来是不是很难？

Answer 1

    public class GetYahooData
    {
        public ArrayList<JSONObject> getOutputFromUrl(String url) 
        {
            ArrayList<JSONObject> output = new ArrayList<JSONObject>();
            HttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);
            HttpResponse response;
            StringBuilder builder= new StringBuilder();
            JSONObject myjson ;
            JSONArray the_json_array;
            try 
            {
                response = httpClient.execute(httpPost);
                BufferedReader in = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
                char[] buf = new char[8000];
                int l = 0;
                    while (l >= 0) 
                    {
                        builder.append(buf, 0, l);
                        l = in.read(buf);
                    }
                myjson = new JSONObject("{child:"+builder.toString()+"}");
                JSONObject mmm = new JSONObject(builder.toString());
                JSONArray mmmArr = mmm.getJSONArray("status");
                the_json_array = myjson.getJSONArray("child");
                for (int i = 0; i < the_json_array.length(); i++) 
                {
                    JSONObject another_json_object =  the_json_array.getJSONObject(i);//the_json_array.getJSONObject(i);
                    output.add(another_json_object);
                }
            } catch (ClientProtocolException e) {
                System.out.println("ClientProtocolException :"+e);
                e.printStackTrace();
            } catch (IOException e) {
                System.out.println("IOException :"+e);
                e.printStackTrace();
            } catch (JSONException e) {
                System.out.println("JSONException hussain :"+e);
                e.printStackTrace();
            }
            return output;
        }
    }

public class useYahoo
{
    public static void main(String args[])
    {
        String url = "the url you want the response from";
        getYahooData object = new GetYahooData();
        ArrayList<JSONObject> output = object.getOutputFromUrl(url);
    }
}