com.jesjimher.bicipalma.BicipalmaJsonClient.java Source code

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Here is the source code for com.jesjimher.bicipalma.BicipalmaJsonClient.java

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/* Copyright 2012 Jess Jimnez Herranz
 * 
 * This file is part of BuscaBici
 * 
 * BuscaBici is free software: you can redistribute it and/or modify 
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or 
 * (at your option) any later version.
 * 
 * BuscaBici is distributed in the hope that it will be useful, but WITHOUT 
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
 * for more details.
 * 
 * You should have received a copy of the GNU General Public License along 
 * with BuscaBici. If not, see <http://www.gnu.org/licenses/>.
 */

package com.jesjimher.bicipalma;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONArray;
import org.json.JSONException;

public class BicipalmaJsonClient {

    // Se conecta a una URL para obtener un objeto JSON
    public static JSONArray connect(String url) {

        JSONArray json = new JSONArray();

        try {
            // Primero conectar a la URL base para capturar el id de sesin
            HttpGet hg = new HttpGet("http://83.36.51.60:8080/eTraffic3/Control?act=mp");
            HttpParams httpParameters = new BasicHttpParams();
            // Poner los timeouts apropiadamente
            int timeoutConnection = 5000;
            HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
            int timeoutSocket = 7000;
            HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
            DefaultHttpClient hcli = new DefaultHttpClient(httpParameters);
            HttpResponse resp = hcli.execute(hg);
            if (resp.getStatusLine().getStatusCode() == 200) {
                // Con el JSESSIONID, conectar a la URL que recupera el JSON
                String cookie = resp.getFirstHeader("Set-Cookie").getValue().split(";")[0];
                resp.getEntity().consumeContent();
                hg = new HttpGet(
                        "http://83.36.51.60:8080/eTraffic3/DataServer?ele=equ&type=401&li=2.6226425170898&ld=2.6837539672852&ln=39.588022779794&ls=39.555621694894&zoom=15&adm=N&mapId=1&lang=es");
                hg.setHeader("Referer", "http://83.36.51.60:8080/eTraffic3/Control?act=mp");
                hg.addHeader("Cookie", cookie);
                resp = hcli.execute(hg);
                if (resp.getStatusLine().getStatusCode() == 200) {
                    HttpEntity he = resp.getEntity();
                    if (he != null) {
                        // A Simple JSON Response Read
                        InputStream instream = he.getContent();
                        // Averiguar el encoding
                        String enc = he.getContentType().getValue();
                        enc = enc.substring(enc.indexOf("charset=") + 8);
                        if (enc.length() <= 0)
                            enc = "ISO-8859-1";
                        String result = convertStreamToString(instream, enc);

                        json = new JSONArray(result);
                        instream.close();
                    }
                    resp.getEntity().consumeContent();
                }
            }
        } catch (IOException e1) {
            e1.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return json;
    }

    // Convierte un InputStream a una cadena
    public static String convertStreamToString(InputStream is, String encoding) {
        BufferedReader reader = null;
        try {
            reader = new BufferedReader(new InputStreamReader(is, encoding));
        } catch (UnsupportedEncodingException e1) {
            // Si el encoding proporcionado no es vlido, usar el encoding por defecto
            reader = new BufferedReader(new InputStreamReader(is));
        }
        StringBuilder sb = new StringBuilder();

        String line = null;
        try {
            while ((line = reader.readLine()) != null)
                sb.append(line + "\n");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
}