直接调用iReport生成的jrxml文件生成报表

public class JasperReportsIntro

{

 public static void main(String[] args)

 {

    JasperReport jasperReport;

    JasperPrint jasperPrint;

    try

    {

      jasperReport = JasperCompileManager.compileReport(          "reports/jasperreports_demo.jrxml");      jasperPrint = JasperFillManager.fillReport(          jasperReport, new HashMap(), new JREmptyDataSource());      JasperExportManager.exportReportToPdfFile(          jasperPrint, "reports/simple_report.pdf");

    }

    catch (JRException e)

    {

      e.printStackTrace();

    }

 }

}