DownloadFileServlet.java

/*
 * Copyright (c) 2002-2020, City of Paris
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice
 *     and the following disclaimer.
 *
 *  2. Redistributions in binary form must reproduce the above copyright notice
 *     and the following disclaimer in the documentation and/or other materials
 *     provided with the distribution.
 *
 *  3. Neither the name of 'Mairie de Paris' nor 'Lutece' nor the names of its
 *     contributors may be used to endorse or promote products derived from
 *     this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * License 1.0
 */
package fr.paris.lutece.plugins.jasper.service;

import fr.paris.lutece.portal.service.util.AppLogService;

import java.io.IOException;

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

/**
 * DownloadFileServlet
 *
 *
 */
public class DownloadFileServlet extends HttpServlet
{
    private static final long serialVersionUID = -6564244054015195801L;

    public DownloadFileServlet( )
    {
        super( );
    }

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * 
     * @param request
     *            servlet request
     * @param response
     *            servlet response
     * @throws ServletException
     *             the servlet Exception
     * @throws IOException
     *             the io exception
     */
    protected void processRequest( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException
    {
        try
        {
            byte [ ] fileContent = JasperFileLinkService.exportFile( request );
            String strFileName = JasperFileLinkService.getFileName( request );

            if ( fileContent != null )
            {
                // the header and also the names set by which user will be prompted to save
                response.setHeader( "Content-Disposition", "attachment;filename=\"" + strFileName + "\"" );

                String strMimetype = getServletContext( ).getMimeType( strFileName );
                response.setContentType( ( strMimetype != null ) ? strMimetype : "application/octet-stream" );
                response.setHeader( "Cache-Control", "must-revalidate" );
                response.getOutputStream( ).write( fileContent );
            }
        }
        catch( Exception e )
        {
            AppLogService.error( e.getMessage( ), e );
        }
        finally
        {
            response.getOutputStream( ).flush( );
        }
    }

    /**
     * Handles the HTTP <code>GET</code> method.
     * 
     * @param request
     *            servlet request
     * @param response
     *            servlet response
     * @throws ServletException
     *             the servlet Exception
     * @throws IOException
     *             the io exception
     */
    protected void doGet( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException
    {
        processRequest( request, response );
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     * 
     * @param request
     *            servlet request
     * @param response
     *            servlet response
     * @throws ServletException
     *             the servlet Exception
     * @throws IOException
     *             the io exception
     */
    protected void doPost( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException
    {
        processRequest( request, response );
    }

    /**
     * Returns a short description of the servlet.
     * 
     * @return message
     */
    public String getServletInfo( )
    {
        return "Servlet downloadFile content";
    }
}