小编Sai*_*nik的帖子

在Excel中生成报告时，显示以下错误消息。请帮忙！！！

码：-

public String mainReportXLS(){

    Map<String, Object> jrxmlParams = null;

    try{

        String jrxmlFileName = "C:/Jasper/Dashboard2.jrxml";

        JasperReport objJReport = JasperCompileManager.compileReport(jrxmlFileName);
        connection = getConnection();

        JasperPrint print = JasperFillManager.fillReport(objJReport, jrxmlParams, connection);
        ByteArrayOutputStream outputByteArray = new ByteArrayOutputStream();
        //OutputStream outputfile= new FileOutputStream(new File("c:/output/JasperReport.xls"));

         JRXlsExporter exporterXLS = new JRXlsExporter();
         exporterXLS.setParameter(JRXlsExporterParameter.JASPER_PRINT, print);
         exporterXLS.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, "C:/Jasper/Dashboard2.xls" );
         exporterXLS.setParameter(JRXlsExporterParameter.OUTPUT_STREAM, outputByteArray);
         exporterXLS.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET, Boolean.FALSE);
         exporterXLS.setParameter(JRXlsExporterParameter.IS_DETECT_CELL_TYPE, Boolean.TRUE);
         exporterXLS.setParameter(JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND, Boolean.FALSE);
         exporterXLS.setParameter(JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS, Boolean.TRUE);
         exporterXLS.exportReport();

         //outputfile.write(outputByteArray.toByteArray()); 


    }catch (Exception e) {
           System.out.print("Exceptiion" + e);
      }

    return null;
}

查看错误消息：-

]] Root cause of ServletException.
javax.faces.FacesException: Error calling …

尝试下面的代码,但不生成PDF报告.刚开始使用Jasper integartion.请帮忙.

public String mainReport() {
      HashMap jrxmlParams = null;


      try {
       System.out.println("Start ....");
       // Get jasper report
       String jrxmlFileName = "C:/Jasper/DP_crosstabs.jrxml";


       JasperReport objJReport = JasperCompileManager.compileReport(jrxmlFileName);

       connection = getConnection();

       jrxmlParams = new HashMap();
       jrxmlParams.put("ID", "null");

       JasperPrint objJPrint = JasperFillManager.fillReport(objJReport, jrxmlParams, connection);

       ByteArrayOutputStream objBAOutputStream = new ByteArrayOutputStream();

       JasperExportManager.exportReportToPdfStream(objJPrint, objBAOutputStream);



       System.out.println("Done exporting reports to pdf");



      } catch (Exception e) {
       System.out.print("Exceptiion" + e);
      }
    return null;
     }