Java – excel cell format in jasperreport Report

I'm studying the jasperreport report that generates Excel files For some reason, my cell format / type is not how they should be For example, I have a date object in the cell, but when I generate an excel file, it sets the cell type to number, or the long type is the text in the cell, but the cell format is a number, and when the user edits the date cell (for example, the date is 11 / 02 / 2012 is changed to 11 / 03 / 2012), it converts the date to a number (41581.00)

This is my code (it just outputs the pop-up stream to the browser window with the report):

public void generateXLSPopup(String tmpltFileLocation,Map<String,Object> params,Collection vo) {
    log.fine("ReportEngine: Start Generate XLS Popup Report Function!");

    Filename f = new Filename(tmpltFileLocation);

    String xlsFileName = f.getFileName() +  "_" + sDateFormated + ".xlsx";

    try {
        JasperPrint jasperPrint = getJRPrint(tmpltFileLocation,params,new JRBeanCollectionDataSource(vo));

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        JRXlsxExporter exporter = getCommonXlsxExporter();

        exporter.setParameter(JRXlsExporterParameter.JASPER_PRINT,jasperPrint);
        exporter.setParameter(JRXlsExporterParameter.OUTPUT_STREAM,baos); // fill byte array output stream

        exporter.exportReport();

        FacesContext context = FacesContext.getCurrentInstance();
        HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse();

        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        response.setHeader("Content-disposition","attachment; filename=" + xlsFileName);
        response.setContentLength(baos.size());
        response.getOutputStream().write(baos.toByteArray());
        context.responseComplete();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    log.fine("ReportEngine: Finish Generate XLS Popup Report Function!");
}


private JRXlsxExporter getCommonXlsxExporter(){
    JRXlsxExporter exporter = new JRXlsxExporter();
    exporter.setParameter(JRXlsExporterParameter.IGNORE_PAGE_MARGINS,Boolean.TRUE);
    exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET,Boolean.FALSE);
    exporter.setParameter(JRXlsExporterParameter.IS_AUTO_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.setParameter(JExcelApiExporterParameter.IS_DETECT_CELL_TYPE,Boolean.TRUE);
    //exporter.setParameter(JRXlsExporterParameter.IS_DETECT_CELL_TYPE,Boolean.TRUE);


    return exporter;
}

The following are examples of the first few lines in my Jasper report XML file:

<textField isStretchWithOverflow="true" isBlankWhenNull="true">
                <reportElement style="alternateStyle" stretchType="RelativeToBandHeight" x="0" y="0" width="100" height="20"/>
                <textElement/>
                <textFieldExpression class="java.lang.Long"><![CDATA[$F{id}]]></textFieldExpression>
            </textField>
            <textField isStretchWithOverflow="true" isBlankWhenNull="true">
                <reportElement style="alternateStyle" stretchType="RelativeToBandHeight" x="200" y="0" width="100" height="20"/>
                <textElement/>
                <textFieldExpression class="java.lang.String"><![CDATA[$F{emsProdNo}]]></textFieldExpression>
            </textField>
            <textField isStretchWithOverflow="true" isBlankWhenNull="true">
                <reportElement style="alternateStyle" stretchType="RelativeToBandHeight" x="100" y="0" width="100" height="20"/>
                <textElement/>
                <textFieldExpression class="java.lang.String"><![CDATA[$F{courseName}]]></textFieldExpression>
            </textField>
            <textField isStretchWithOverflow="true" pattern="MMMMM dd,yyyy" isBlankWhenNull="true">
                <reportElement style="alternateStyle" stretchType="RelativeToBandHeight" x="300" y="0" width="98" height="20"/>
                <textElement>
                    <font isUnderline="true"/>
                </textElement>
                <textFieldExpression class="java.util.Date"><![CDATA[$F{startDate}]]></textFieldExpression>
            </textField>
            <textField isStretchWithOverflow="true" isBlankWhenNull="true">
                <reportElement style="alternateStyle" stretchType="RelativeToBandHeight" x="474" y="0" width="81" height="20"/>
                <textElement/>
                <textFieldExpression class="java.lang.String"><![CDATA[$F{endDateStr}]]></textFieldExpression>
            </textField>

(please don't ask me why I generate jasperreport template files dynamically, which is the way I need.)

Solution

The parameter net. Net has been introduced in the new version of Jasper reports sf. jasperreports. export. xls. pattern.

example:

<textField pattern="EEE,MMM d,yyyy">
    <reportElement x="100" y="12" width="75" height="11">
        <property name="net.sf.jasperreports.export.xls.pattern" value="ddd,mmm d,yyyy"/>
    </reportElement>
    <textElement textAlignment="Right"/>
    <textFieldExpression class="java.sql.Timestamp"><![CDATA[$F{dateField}]]>
    </textFieldExpression>
</textField>

The information about this parameter is here The sample used is here