Java tutorial
/** DR Radio 2 is developed by Jacob Nordfalk, Hanafi Mughrabi and Frederik Aagaard. Some parts of the code are loosely based on Sveriges Radio Play for Android. DR Radio 2 for Android is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. DR Radio 2 for Android 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 DR Radio 2 for Android. If not, see <http://www.gnu.org/licenses/>. */ package dk.dr.radio.data; import org.apache.http.HttpResponse; import org.apache.http.HttpVersion; import org.apache.http.client.HttpClient; 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.apache.http.params.HttpProtocolParams; import org.apache.http.protocol.HTTP; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.io.BufferedInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.Reader; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import dk.dr.radio.data.spiller_nu.SpillerNu; import dk.dr.radio.data.spiller_nu.SpillerNuElement; import dk.dr.radio.data.stamdata.Kanal; import dk.dr.radio.data.stamdata.Stamdata; import dk.dr.radio.data.udsendelser.Udsendelse; import dk.dr.radio.data.udsendelser.Udsendelser; import dk.dr.radio.diverse.Log; public class JsonIndlaesning { /** * Henter stamdata (faste data) * * @throws IOException hvis der er et problem med netvrk * eller parsning (dvs interne fejl af forskellig art som br rapporteres til udvikler) */ public static Stamdata parseStamdata(String str) throws JSONException { //Log.d("str=\n============="+str+"\n=================="); Stamdata d = new Stamdata(); JSONObject json = d.json = new JSONObject(str); d.kanalkoder = jsonArrayTilArrayListString(json.getJSONArray("kanalkoder")); d.p4koder = jsonArrayTilArrayListString(json.getJSONArray("p4koder")); JSONArray kanaler = json.getJSONArray("kanaler"); int antal = kanaler.length(); for (int i = 0; i < antal; i++) { JSONObject j = kanaler.getJSONObject(i); Kanal k = new Kanal(); k.shortName = j.optString("shortName", ""); k.longName = j.optString("longName", ""); k.aacUrl = j.optString("aacUrl", ""); k.rtspUrl = j.optString("rtspUrl", ""); k.shoutcastUrl = j.optString("shoutcastUrl", ""); d.kanaler.add(k); } //Log.d("TIDSTAGNING parsning tog "+dt("parsning stamdataUrl")); //d.lavKanalkodeTilKanalMap(); for (Kanal k : d.kanaler) { d.kanalkodeTilKanal.put(k.shortName, k); } d.kanalerDerSkalViseSpillerNu.addAll(jsonArrayTilArrayListString(json.getJSONArray("vis_spiller_nu"))); return d; } static Udsendelser hentUdsendelser(String url) throws Exception { String jsondata = hentUrlSomStreng(url); JSONObject json = new JSONObject(jsondata); Udsendelser uds = new Udsendelser(); uds.currentProgram = jsonTilUdsendelse(json.getJSONObject("currentProgram")); uds.nextProgram = jsonTilUdsendelse(json.getJSONObject("nextProgram")); //Log.d("TIDSTAGNING parsning tog "+dt("parsning "+url)); return uds; } private static HttpClient httpClient; public static String hentUrlSomStreng(String url) throws IOException { // AndroidHttpClient er frst defineret fra Android 2.2 //if (httpClient == null) httpClient = android.net.http.AndroidHttpClient.newInstance("Android DRRadio"); if (httpClient == null) { HttpParams params = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(params, 15 * 1000); HttpConnectionParams.setSoTimeout(params, 15 * 1000); HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1); HttpProtocolParams.setContentCharset(params, HTTP.DEFAULT_CONTENT_CHARSET); //HttpProtocolParams.setUseExpectContinue(params, true); HttpProtocolParams.setUserAgent(params, "Android DRRadio/1.x"); httpClient = new DefaultHttpClient(params); } //dt(""); //Log.d("Henter " + url); //Log.e(new Exception("Henter "+url)); //InputStream is = new URL(url).openStream(); HttpGet c = new HttpGet(url); HttpResponse response = httpClient.execute(c); InputStream is = response.getEntity().getContent(); String jsondata = lsInputStreamSomStreng(is); //Log.d("Hentede "+url+" p "+dt("hente "+url)); // frederik: GratisDanmark fix: Strip the file of XML tags that might ruin the JSON format jsondata.replaceAll("<[^>]*>", ""); return jsondata; } public static String lsInputStreamSomStreng(InputStream is) throws IOException, UnsupportedEncodingException { // Det kan vre ndvendigt at hoppe over BOM mark - se http://android.forums.wordpress.org/topic/xml-pull-error?replies=2 //is.read(); is.read(); is.read(); // - dette virker kun hvis der ALTID er en BOM // Hop over BOM - hvis den er der! is = new BufferedInputStream(is); // bl.a. FileInputStream understtter ikke mark, s brug BufferedInputStream is.mark(1); // vi har faktisk kun brug for at sge n byte tilbage if (is.read() == 0xef) { is.read(); is.read(); } // Der var en BOM! Ls de sidste 2 byte else is.reset(); // Der var ingen BOM - hop tilbage til start final char[] buffer = new char[0x3000]; StringBuilder out = new StringBuilder(); Reader in = new InputStreamReader(is, "UTF-8"); int read; do { read = in.read(buffer, 0, buffer.length); if (read > 0) { out.append(buffer, 0, read); } } while (read >= 0); in.close(); return out.toString(); } static SpillerNu hentSpillerNuListe(String url) throws Exception { String str = hentUrlSomStreng(url); SpillerNu d = new SpillerNu(); //mapper.readValue(jsondata, SpillerNu.class); JSONObject json = new JSONObject(str); JSONArray liste = json.getJSONArray("tracks"); int antal = liste.length(); for (int i = 0; i < antal; i++) { JSONObject j = liste.getJSONObject(i); SpillerNuElement e = new SpillerNuElement(); e.title = j.optString("title", ""); e.displayArtist = j.optString("displayArtist", ""); e.lastFM = j.optString("lastFM", ""); e.start = j.optString("start", ""); d.liste.add(e); } return d; } /* private static long frsteTid; private static long sidsteTid; private static Map<String,Integer> tidstagning = new TreeMap<String,Integer>(); private static String dt(String hvad) { hvad = hvad + " "; long nu = System.currentTimeMillis(); int dt = (int) (nu - sidsteTid); sidsteTid = nu; if (frsteTid==0) frsteTid = nu; int samlet = dt; if (tidstagning.containsKey(hvad)) samlet += tidstagning.get(hvad); tidstagning.put(hvad, samlet); return dt + " ms"; }*/ public static ArrayList<String> jsonArrayTilArrayListString(JSONArray j) throws JSONException { int n = j.length(); ArrayList<String> res = new ArrayList<String>(n); for (int i = 0; i < n; i++) { res.add(j.getString(i)); } return res; } private static Udsendelse jsonTilUdsendelse(JSONObject j) throws JSONException { Udsendelse u = new Udsendelse(); u.description = j.optString("description", ""); u.start = j.optString("start", ""); u.stop = j.optString("stop", ""); u.title = j.optString("title", ""); return u; } }