GeneratePDF.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2019 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package org.turro.pdf;
 
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Collection;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import org.amic.util.file.FileUtil;
 
public class GeneratePDF {
  
  public static void writeAsResponse(HttpServletResponse response, String jasperFile, Collection collection, Map parameters) {
    ServletOutputStream output = null;
    try {
      response.setContentType("application/pdf");
      response.setHeader("pragma", "no-cache");
      response.setHeader("Cache-control", "no-cache, no-store, must-revalidate");
      response.setHeader("Expires", "01 Apr 1995 01:10:10 GMT");
      response.setHeader( "Content-Disposition", "filename=" + FileUtil.getBaseName(new File(jasperFile)) +".pdf" );
            
      output = response.getOutputStream();
      exportToStream(output, jasperFile, collection, parameters);
      output.flush();
    } catch (IOException ex) {
      Logger.getLogger(GeneratePDF.class.getName()).log(Level.SEVERE, null, ex);
    } finally {
      try {
        output.close();
      } catch (IOException ex) {
        Logger.getLogger(GeneratePDF.class.getName()).log(Level.SEVERE, null, ex);
      }
    }
  }
  
  public static void exportToStream(OutputStream out, String jasperFile, Collection collection, Map parameters) {
    try {
      JRDataSource dataSource = new JRBeanCollectionDataSource(collection);
      JasperPrint jasperPrint = JasperFillManager.fillReport(jasperFile, parameters, dataSource);
      JasperExportManager.exportReportToPdfStream(jasperPrint, out);
    } catch (JRException ex) {
      Logger.getLogger(GeneratePDF.class.getName()).log(Level.SEVERE, null, ex);
    }
  }
 
}