Java tutorial
/** * * Copyright (c) 2009-2013 Freedomotic team http://freedomotic.com * * This file is part of Freedomotic * * This Program 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 2, or (at your option) any later version. * * This Program 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 * Freedomotic; see the file COPYING. If not, see * <http://www.gnu.org/licenses/>. */ package com.freedomotic.plugin.purl; import com.freedomotic.api.EventTemplate; import com.freedomotic.api.Protocol; import com.freedomotic.events.GenericEvent; import com.freedomotic.exceptions.UnableToExecuteException; import com.freedomotic.reactions.Command; import java.io.IOException; import java.io.InputStreamReader; import java.io.Reader; import java.net.Authenticator; import java.net.PasswordAuthentication; import java.net.URL; import java.net.URLDecoder; import java.util.logging.Level; import java.util.logging.Logger; import org.apache.http.HttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; public class Purl extends Protocol { private static final Logger LOG = Logger.getLogger(Purl.class.getName()); public Purl() { super("pURL", "/pURL/purl-manifest.xml"); setPollingWait(configuration.getIntProperty("polling_rate", 5000)); //waits 2000ms in onRun method before call onRun() again } @Override public void onStart() { //called when the user starts the plugin from UI } @Override public void onStop() { //called when the user stops the plugin from UI } @Override protected void onRun() { //called in a loop while this plugin is running //loops waittime is specified using setPollingWait() Authenticator.setDefault(new MyAuthenticator()); String pageContent = ""; String url = ""; try { url = URLDecoder.decode(configuration.getStringProperty("url", ""), "UTF-8"); pageContent = readPage(new URL(url)); } catch (Exception ex) { Logger.getLogger(Purl.class.getName()).log(Level.SEVERE, null, ex); } if (!pageContent.isEmpty()) { GenericEvent event = new GenericEvent(this); event.setDestination("app.event.sensor.url"); event.addProperty("url", url); event.addProperty("url.content", pageContent); event.addProperty("url.content.length", String.valueOf(pageContent.length())); notifyEvent(event); setDescription("Readed " + pageContent.length() + "characters"); } } private static String readPage(URL url) throws Exception { DefaultHttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(url.toURI()); HttpResponse response = client.execute(request); Reader reader = null; try { reader = new InputStreamReader(response.getEntity().getContent()); StringBuilder sb = new StringBuilder(); int read; char[] cbuf = new char[1024]; while ((read = reader.read(cbuf)) != -1) { sb.append(cbuf, 0, read); } return sb.toString(); } finally { if (reader != null) { try { reader.close(); } catch (IOException e) { //do nothing } } } } @Override protected void onCommand(Command c) throws IOException, UnableToExecuteException { throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. } @Override protected boolean canExecute(Command c) { throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. } @Override protected void onEvent(EventTemplate event) { throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates. } class MyAuthenticator extends Authenticator { @Override public PasswordAuthentication getPasswordAuthentication() { String kuser, kpass; // I haven't checked getRequestingScheme() here, since for NTLM // and Negotiate, the usrname and password are all the same. //System.err.println("Feeding username and password for " + getRequestingScheme()); kuser = configuration.getStringProperty("url_username", ""); kpass = configuration.getStringProperty("url_password", ""); return (new PasswordAuthentication(kuser, kpass.toCharArray())); } } }