Instanciate Excel into JSP page

Hi all,

I'm new in JSP and Excel matters.

Background:
My J2EE application utilises JASPER REPORTS and generates a PDF
without any problems but I still have problems displaying my report in
Excel format. Anyway I need to display a XLS file within a JSP page.
Jasper already generates the XLS file but I'm not able to open the
file within my web browser.

My current code:

<%@ page language="java" %>
<%@ page import="java.io.*" %>
<%@ page import="java.util.*" %>
<%@ page import="net.sf.jasperreports.engine.*" %>
<%@ page import="net.sf.jasperreports.engine.export.*" %>
<%@ page import="net.sf.jasperreports.view.JasperViewer" %>
<%@ page import="java.sql.DriverManager" %>
<%@ page import="import java.sql.SQLException" %>
<%@ page import="import java.util.HashMap" %>
<%@ page import="import java.util.Map" %>
<%@ page import="import net.sf.jasperreports.engine.JRException" %>
<%@ page import="import
net.sf.jasperreports.engine.JasperCompileManager" %>
<%@ page import="import
net.sf.jasperreports.engine.JasperExportManager" %>
<%@ page import="import net.sf.jasperreports.engine.JasperFillManager"
%>
<%@ page import="import net.sf.jasperreports.engine.JasperPrint" %>
<%@ page import="import net.sf.jasperreports.engine.JasperReport" %>
<%@ page import="import net.sf.jasperreports.view.JasperViewer" %>
<%@ page import="net.sf.jasperreports.engine.design.JasperDesign" %>
<%@ page import="net.sf.jasperreports.engine.xml.JRXmlLoader" %>
<%@ page import="net.sf.jasperreports.engine.export.*" %>

<%
    String filename = "CondensadosSiniestros.jrxml";
    String reporttype = request.getParameter("formato");
    Map params = new HashMap();
    params.put("pFechaIni","01012007");
    params.put("pFechaFin","31012007");
    params.put("pUsuario","GUHD4624");
    params.put("pOrigen","1");

    //DATABASE
CONNECTION*******************************************************
    Class.forName("oracle.jdbc.driver.OracleDriver");
    java.sql.Connection conn =
DriverManager.getConnection("jdbc:oracle:thin:@10.0.00.00:1522:RG",
"login", "pwd");

    //PATH
GENERATION***********************************************************
    String path = application.getRealPath("/reports/templates/");
    String reportSource = path + "/" + filename;
    String pdfExportFile = path + "/exported.pdf";
    String xlExportFile = path + "/exported.xls";

    System.out.println("pdfExportFile:" + pdfExportFile);
    System.out.println("xlExportFile: " + xlExportFile);

    //JASPER
STUFF**************************************************************
    JasperReport jasperReport =
JasperCompileManager.compileReport(reportSource);
    JasperPrint jasperPrint =
JasperFillManager.fillReport(jasperReport, params, conn);

    OutputStream ouputStream = response.getOutputStream();

    JRExporter exporter = null;

    if( "pdf".equalsIgnoreCase(reporttype) ) {

    response.setContentType("application/pdf");
     response.setHeader("Content-disposition","inline; filename=
\"exported.pdf\"");
        response.setHeader("Cache-Control", "max-age=260");

    exporter = new JRPdfExporter();
    exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
    exporter.setParameter(JRExporterParameter.OUTPUT_STREAM,
ouputStream);
        JasperExportManager.exportReportToPdfFile(jasperPrint,
pdfExportFile);

    DataInputStream is=
       new DataInputStream(
          new FileInputStream(pdfExportFile));

    DataOutputStream os =
       new DataOutputStream(response.getOutputStream());

    try {
     while(true) os.write(is.readByte());
    } catch(EOFException eofexc) {
     //ready
    } catch(IOException ioexc) {

     System.out.println("Caught io exception:" + ioexc);
    }

    is.close();
    os.close();

        exporter.exportReport();

    } else if( "xls".equalsIgnoreCase(reporttype) ) {

        response.setContentType("application/xls");
     response.setHeader("Content-disposition","inline; filename=
\"exported3.xls\"");
            //response.setHeader("Cache-Control", "max-
age=260");

    ByteArrayOutputStream arrayOutputStream = new
ByteArrayOutputStream();

    //OutputStream out = response.getOutputStream();
        //exporterXLS = new JRXlsExporter();

     //JRXlsExporter exporterXLS = new JRXlsExporter();
        exporter = new JRXlsExporter();
    exporter.setParameter(JRXlsExporterParameter.JASPER_PRINT,
jasperPrint);
     exporter.setParameter(JRXlsExporterParameter.OUTPUT_STREAM,
ouputStream);
        //exporter.setParameter(JRXlsExporterParameter.OUTPUT_STREAM,
arrayOutputStream);
 
exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET,
Boolean.TRUE);
     exporter.setParameter(JRXlsExporterParameter.IS_DETECT_CELL_TYPE,
Boolean.TRUE);
 
exporter.setParameter(JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND,
Boolean.FALSE);
 
exporter.setParameter(JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS,
Boolean.TRUE);
     exporter.exportReport();

    }
    try {
    exporter.exportReport();
    } catch (JRException e) {
    throw new ServletException(e);
    } finally {
    if (ouputStream != null) {
        try{
            ouputStream.close();
        } catch (IOException ex) {}
    }
    }
%>

I appreciate your help,

David ;-)