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DynamicJasper (DJ) is an API that hides the complexity of Jasper Reports, it helps developers to save time when designing simple/medium complexity reports generating the layout of the report elements automatically. It creates reports dynamically, defining at runtime the columns, column width (auto width), groups, variables, fonts, charts, crosstabs, sub reports (that can also be dynamic), page size and everything else that you can define at design time. DJ keeps full compatibility with Jasper Reports since it's a tool that helps create reports programmatically in a easy way (it only interferes with the creation of the report design doing the layout of the elements). You can use the classic .jrxml files as templates while the content and layout of the report elements are handled by the DJ API. http://dynamicjasper.com

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/*
 * Dynamic Jasper: 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 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;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

/**
 * @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();
        }
    }
}