org.daxplore.presenter.server.servlets.PresenterBrowserServlet.java Source code

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Here is the source code for org.daxplore.presenter.server.servlets.PresenterBrowserServlet.java

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/*
 *  This file is part of Daxplore Presenter.
 *
 *  Daxplore Presenter 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 2.1 of the License, or
 *  (at your option) any later version.
 *
 *  Daxplore Presenter 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 Daxplore Presenter.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.daxplore.presenter.server.servlets;

import java.io.IOException;
import java.io.Writer;
import java.text.MessageFormat;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.IOUtils;
import org.daxplore.presenter.server.throwable.InternalServerException;

@SuppressWarnings("serial")
public class PresenterBrowserServlet extends HttpServlet {
    private static Logger logger = Logger.getLogger(PresenterBrowserServlet.class.getName());
    private static String welcomeTemplate = null;

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) {
        try {
            if (welcomeTemplate == null) {
                try {
                    welcomeTemplate = IOUtils
                            .toString(getServletContext().getResourceAsStream("/templates/welcome.html"));
                } catch (IOException e) {
                    throw new InternalServerException("Failed to load the welcome template", e);
                }
            }

            String baseurl = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort();

            String[] arguments = { baseurl };

            String responseHTML = MessageFormat.format(welcomeTemplate, (Object[]) arguments);

            response.setContentType("text/html; charset=UTF-8");
            try (Writer writer = response.getWriter()) {
                writer.write(responseHTML);
            } catch (IOException e) {
                throw new InternalServerException("Failed to display presenter servlet", e);
            }
        } catch (InternalServerException e) {
            logger.log(Level.SEVERE, e.getMessage(), e);
            response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        } catch (Exception e) {
            logger.log(Level.SEVERE, "Unexpected exception: " + e.getMessage(), e);
            response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        }
    }
}