Jasper生成Excel文件错误“ Excel在..中发现了不可读的内容”

Question

I'm using Java and Jasper to generate reports in .xlsx format. And I was successful and I have components in my application which create actual reports with data.

recently I was trying to add another component and the report generation was successful , but the generated .xslx file wont open with MS Excel or any other.

the code parts are below.

    ArrayList<ReportBean> reportBean =  new ArrayList<ReportBean>();

    response.setHeader("Content-Disposition",  "attachment;filename=BudgetaryQuote.xlsx");
    response.setContentType("application/xlsx");
    OutputStream outStream = response.getOutputStream();

    Report report = new Report(template, "xlsx", reportBean, outStream);
    //Report(String template, String format, ArrayList dataList,OutputStream outputStream) 
    report.generateReport();

in generateReport() it has ,

        InputStream inputStream = new FileInputStream(new File(this.template));  
        JRBeanCollectionDataSource beanColDataSource = new JRBeanCollectionDataSource(this.dataList); 
        JasperDesign jasperDesign = JRXmlLoader.load(inputStream); 
        JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign); 
        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, beanColDataSource);

        if(this.format.equalsIgnoreCase(XLSX)) {

            JRXlsxExporter Xlsxexporter = new JRXlsxExporter();
            Xlsxexporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
            Xlsxexporter.setParameter(JRExporterParameter.OUTPUT_STREAM,  outputStream);
            Xlsxexporter.exportReport();            

        }

the .jrxml file (It's pretty much blank)

     <?xml version="1.0" encoding="UTF-8"?>
     <jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="timeSheetDetailedReport" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="4ffef809-ea2d-4533-a0b9-bdd2d055afbe">
<property name="ireport.zoom" value="1.0"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<background>
    <band splitType="Stretch"/>
</background>
<title>
    <band height="79" splitType="Stretch"/>
</title>
<pageHeader>
    <band height="35" splitType="Stretch"/>
</pageHeader>
<columnHeader>
    <band height="61" splitType="Stretch"/>
</columnHeader>
<detail>
    <band height="125" splitType="Stretch"/>
</detail>
<columnFooter>
    <band height="45" splitType="Stretch"/>
</columnFooter>
<pageFooter>
    <band height="54" splitType="Stretch"/>
</pageFooter>
<summary>
    <band height="42" splitType="Stretch"/>
</summary>

There is an error like in the image. "Excel found unreadable content in filename.xls. Do you want to recover the contents of this workbook? If you trust the source of this workbook, click Yes."

How can I check what is the wrong with the file ?

Answer 1

I just solved the problem. But it's not clear.

my code had the below code ,

ArrayList<ReportBean> reportBean =  new ArrayList<ReportBean>();
Report report = new Report(template, "xlsx", reportBean, outStream);
report.generateReport();

The problem was the ArrayList reportBean was empty. The I add an dummy ReportBean to the list and the problem was solved.

But I have no idea how it solved the problem and why