jasperReport实现动态列打印

public ActionResult projectPrint() {
    String[] printValue = null;
    // 从页面中获得要查询的字段
    String reqPrintValue = getRequest().getParameter("printValue");
    // 没有选择则默认全打印
    if (null == reqPrintValue || StringUtils.isEmpty(reqPrintValue)) {
      printValue = new String[] { "pnumber", "pname", "pdepart", "pdecision", "pthrow", "plastmonth", "pfund", "ploan" };
    } else {
      printValue = reqPrintValue.split(",");
    }
    // 查询统计数据
    List projectList = getEntityManager().queryPrintProjectInfo(printValue);

    // 将数据转换为Map对象，换化成Map对象
    List

 

public static void export(JasperPrint jasperPrint, HttpServletResponse response, HttpServletRequest request,
      String type) throws IOException {
    if (EXCEL_TYPE.equals(type)) {
      exportExcel(jasperPrint, response, request);
    } else if (PDF_TYPE.equals(type)) {
      exportPDF(jasperPrint, response, request);
    } else if (HTML_TYPE.equals(type)) {
      exportHTML(jasperPrint, response, request);
    } else {
      exportPrint(jasperPrint, response, request);
    }

  }

 

public static void exportExcel(JasperPrint jasperPrint, HttpServletResponse response, HttpServletRequest request)
      throws IOException {
    response.setContentType("application/vnd.ms-excel");
    String filename = DownloadHelper.encodeFilename("未命名.xls", request);
    response.setHeader("Content-disposition", "attachment;filename=" + filename);
    ServletOutputStream ouputStream = response.getOutputStream();
    JRXlsExporter exporter = new JRXlsExporter();
    exporter.setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
    exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, ouputStream);
    exporter.setParameter(JRXlsExporterParameter.IS_REMOVE_EMPTY_SPACE_BETWEEN_ROWS, Boolean.TRUE);
    exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET, Boolean.FALSE);
    exporter.setParameter(JRXlsExporterParameter.IS_WHITE_PAGE_BACKGROUND, Boolean.FALSE);
    try {
      exporter.exportReport();
    } catch (JRException e) {
      e.printStackTrace();
    }
    ouputStream.flush();
    ouputStream.close();
  }

  public static void exportPDF(JasperPrint jasperPrint, HttpServletResponse response, HttpServletRequest request)
      throws IOException {
    response.setContentType("application/pdf");
    String filename = DownloadHelper.encodeFilename("未命名.pdf", request);
    response.setHeader("Content-disposition", "attachment;filename=" + filename);
    ServletOutputStream ouputStream = response.getOutputStream();
    try {
      JasperExportManager.exportReportToPdfStream(jasperPrint, ouputStream);
    } catch (JRException e) {
      e.printStackTrace();
    }
    ouputStream.flush();
    ouputStream.close();
  }