Java tutorial
/* * DynamicJasper: A library for creating reports dynamically by specifying * columns, groups, styles, etc. at runtime. It also saves a lot of development * time in many cases! (http://sourceforge.net/projects/dynamicjasper) * * Copyright (C) 2008 FDV Solutions (http://www.fdvsolutions.com) * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * * License as published by the Free Software Foundation; either * * version 2.1 of the License, or (at your option) any later version. * * This library 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 * * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * */ package ar.com.fdvs.dj.output; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import javax.servlet.http.HttpServletResponse; import net.sf.jasperreports.engine.JRException; import net.sf.jasperreports.engine.JRExporter; import net.sf.jasperreports.engine.JRExporterParameter; import net.sf.jasperreports.engine.JasperPrint; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * @author Alejandro Gomez * Date: Feb 23, 2007 * Time: 5:48:17 PM */ public class FileReportWriter extends ReportWriter { private static final Log LOGGER = LogFactory.getLog(FileReportWriter.class); public FileReportWriter(final JasperPrint _jasperPrint, final JRExporter _exporter) { super(_jasperPrint, _exporter); } public void writeTo(final HttpServletResponse _response) throws IOException, JRException { LOGGER.info("entering FileReportWriter.writeTo()"); final File file = File.createTempFile("djreport", ".tmp"); try { exporter.setParameter(JRExporterParameter.OUTPUT_FILE, file); exporter.exportReport(); _response.setContentLength((int) file.length()); copyStreams(new FileInputStream(file), _response.getOutputStream()); } finally { LOGGER.info("deleting " + file.getAbsolutePath()); file.delete(); } } }