Java tutorial
/* ***** BEGIN LICENSE BLOCK ***** * Version: GPL 2.0 * * The contents of this file are subject to the GNU General Public * License Version 2 or later (the "GPL"). * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Initial Developer of the Original Code is * MiniG.org project members * * ***** END LICENSE BLOCK ***** */ package fr.aliasource.webmail.server.invitation; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.HttpStatus; import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.commons.httpclient.params.HttpConnectionManagerParams; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import com.google.gwt.core.client.GWT; import fr.aliasource.webmail.server.FrontEndConfig; import fr.aliasource.webmail.server.calendar.CalendarProxyImpl; import fr.aliasource.webmail.server.proxy.client.IAccount; /** * * @author adrienp * */ public class GoingInvitationProxyImpl extends HttpServlet { /** * */ private static final long serialVersionUID = -1678473146329711601L; @SuppressWarnings("unused") private static final Log logger = LogFactory.getLog(CalendarProxyImpl.class); private String backendUrl; private HttpClient hc; @SuppressWarnings("unchecked") @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { IAccount ac = (IAccount) req.getSession().getAttribute("account"); if (ac == null) { GWT.log("Account not found in session", null); resp.setStatus(HttpServletResponse.SC_FORBIDDEN); return; } PostMethod pm = new PostMethod(backendUrl); if (req.getQueryString() != null) { pm.setQueryString(req.getQueryString()); } Map<String, String[]> params = req.getParameterMap(); for (String p : params.keySet()) { String[] val = params.get(p); pm.setParameter(p, val[0]); } synchronized (hc) { try { int ret = hc.executeMethod(pm); if (ret != HttpStatus.SC_OK) { log("method failed:\n" + pm.getStatusLine() + "\n" + pm.getResponseBodyAsString()); resp.setStatus(ret); } else { InputStream is = pm.getResponseBodyAsStream(); transfer(is, resp.getOutputStream(), false); } } catch (Exception e) { log("error occured on call proxyfication", e); } finally { pm.releaseConnection(); } } } private HttpClient createHttpClient() { HttpClient ret = new HttpClient(new MultiThreadedHttpConnectionManager()); HttpConnectionManagerParams mp = ret.getHttpConnectionManager().getParams(); mp.setDefaultMaxConnectionsPerHost(4); mp.setMaxTotalConnections(8); return ret; } /** * Fast stream transfer method * * @param in * @param out * @throws IOException */ public static void transfer(InputStream in, OutputStream out, boolean closeIn) throws IOException { final byte[] buffer = new byte[4096]; try { while (true) { int amountRead = in.read(buffer); if (amountRead == -1) { break; } out.write(buffer, 0, amountRead); } } finally { if (closeIn) { in.close(); } out.flush(); out.close(); } } @Override public void init() throws ServletException { super.init(); Map<String, String> prefs = new FrontEndConfig().get(); backendUrl = prefs.get("frontend.proxyUrl") + "/goingEvent.do"; this.hc = createHttpClient(); } }