Java tutorial
/** Copyright (c) 2013 Sven Schindler Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ package com.lovbomobile.android.locsy.client.impl; import com.google.gson.Gson; import com.google.gson.JsonSyntaxException; import com.google.gson.reflect.TypeToken; import com.lovbomobile.android.locsy.client.LocsyClient; import com.lovbomobile.android.locsy.entities.Location; import com.lovbomobile.android.locsy.entities.ParceableLocation; import com.lovbomobile.android.locsy.utils.LocationUtils; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPut; import org.apache.http.entity.StringEntity; 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 java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.UnsupportedEncodingException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.HashMap; public class RestLocsyClient implements LocsyClient { private static final String MIME_TYPE_JSON = "application/json"; private static final String HEADER_FIELD_ACCEPT = "Accept"; private static final String HEADER_FIELD_CONTENT_TYPE = "Content-Type"; private static final int DEFAULT_TIMEOUT = 10000; public HashMap<String, ParceableLocation> getFriendsLocation(String userID, String password, String serverAddress) { try { HttpGet httpGet = getHttpGetRequestForFriendsLocations(userID, password, serverAddress); HttpClient httpClient = new DefaultHttpClient(); HttpResponse response = httpClient.execute(httpGet); if (response.getStatusLine().getStatusCode() == 200) { HashMap<String, ParceableLocation> friendLocations = extractFriendsLocationFromHttpResponse( response); return friendLocations; } } catch (IOException e) { } catch (IllegalStateException e) { } return null; } private HttpGet getHttpGetRequestForFriendsLocations(String userID, String password, String serverAddress) { HttpGet httpGet = new HttpGet(getFriendListUrl(userID, password, serverAddress)); httpGet.addHeader(HEADER_FIELD_ACCEPT, MIME_TYPE_JSON); HttpParams httpParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParams, DEFAULT_TIMEOUT); httpGet.setParams(httpParams); return httpGet; } private HashMap<String, ParceableLocation> extractFriendsLocationFromHttpResponse(HttpResponse response) throws IOException { HashMap<String, ParceableLocation> friendLocations = null; HttpEntity entity = response.getEntity(); if (entity != null) { BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent())); String jsonLocations = getJsonStringFromResponse(reader); friendLocations = getFriendsMapFromJsonString(jsonLocations); } return friendLocations; } private HashMap<String, ParceableLocation> getFriendsMapFromJsonString(String jsonLocations) { HashMap<String, ParceableLocation> friendLocations = null; Gson gson = new Gson(); try { friendLocations = gson.fromJson(jsonLocations, new TypeToken<HashMap<String, ParceableLocation>>() { }.getType()); } catch (JsonSyntaxException e) { } return friendLocations; } private String getJsonStringFromResponse(BufferedReader reader) throws IOException { String jsonLocations = ""; String line = null; while ((line = reader.readLine()) != null) { jsonLocations += line; } return jsonLocations; } public void sendLocationToServer(Location location, String userID, String password, String serverAddress) { String url = getUpdateLocationUrl(userID, password, serverAddress); location.setClientTime(System.currentTimeMillis()); String jsonLocation = getJsonStringFromLocation(location); try { HttpPut httpPut = getHttpPutRequestForSendingLocation(url, jsonLocation); HttpClient httpClient = new DefaultHttpClient(); HttpResponse response = httpClient.execute(httpPut); if (response.getStatusLine().getStatusCode() != 200) { //TODO what do we want to do here } } catch (Exception e) { } } private HttpPut getHttpPutRequestForSendingLocation(String url, String jsonLocation) throws UnsupportedEncodingException { HttpPut httpPut = new HttpPut(url); httpPut.setEntity(new StringEntity(jsonLocation)); httpPut.addHeader(HEADER_FIELD_CONTENT_TYPE, MIME_TYPE_JSON); httpPut.addHeader(HEADER_FIELD_ACCEPT, MIME_TYPE_JSON); HttpParams httpParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParams, DEFAULT_TIMEOUT); httpPut.setParams(httpParams); return httpPut; } private String getJsonStringFromLocation(Location location) { Gson gson = new Gson(); return gson.toJson(location); } private String getUpdateLocationUrl(String userID, String password, String serverAddress) { long timestamp = System.currentTimeMillis(); MessageDigest digest; try { digest = MessageDigest.getInstance("SHA1"); String hash = LocationUtils .hexBinaryToString(digest.digest((userID + password + timestamp).getBytes())); return serverAddress + "/locsy/rest/location/user/" + userID + "/" + timestamp + "/" + hash; } catch (NoSuchAlgorithmException e) { return null; } } private String getFriendListUrl(String userID, String password, String serverAddress) { long timestamp = System.currentTimeMillis(); MessageDigest digest; try { digest = MessageDigest.getInstance("SHA1"); String hash = LocationUtils .hexBinaryToString(digest.digest((userID + password + timestamp).getBytes())); return serverAddress + "/locsy/rest/location/user/" + userID + "/friends/" + timestamp + "/" + hash; } catch (NoSuchAlgorithmException e) { return null; } } }