jasperreport使用list输出
http://www.blogjava.net/pdw2009/archive/2007/11/01/157570.html

jasperreport中可以使用List作为数据源，使用格式如下.

List list=this.customerDao.getAllCustomer();  //得到所有客户
JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
   JasperPrint jasperPrint = JasperFillManager.fillReport(
     reportFilePath, parameters, ds);

得填充数据后，即可输出显示到PDF,Excel,Html
到PDF:

public byte[] generatePDF(String begCustNo, String endCustNo,
   String reportTitle, String reportFilePath) throws DemoException {
  // TODO Auto-generated method stub
 //begCustNo,endCustNo分别为查询传入的开始编号，结束编号.
  jdbcCustomerDao = new JdbcCustomerDao();
  Map parameters = new HashMap();
  parameters.put("ReportTitle", reportTitle);//报表标题
  List list = jdbcCustomerDao.getAllCustomer(begCustNo, endCustNo);
   try {
   JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
   JasperPrint jasperPrint = JasperFillManager.fillReport(
     reportFilePath, parameters, ds);   return JasperExportManager.exportReportToPdf(jasperPrint);
  } catch (JRException e) {
   throw new DemoException("Report Export Failed.");
  }
 }

到Html:
public byte[] generateHtml(String begCustNo, String endCustNo,

   String reportTitle, String reportFilePath) throws DemoException {
  jdbcCustomerDao = new JdbcCustomerDao();
  Map parameters = new HashMap();
  parameters.put("ReportTitle", reportTitle);
  List list = jdbcCustomerDao.getAllCustomer(begCustNo, endCustNo);
  System.out.println("list size is :" + list.size());
  JRHtmlExporter exporter = new JRHtmlExporter();
  ByteArrayOutputStream oStream = new ByteArrayOutputStream();
  try {
   JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
   JasperPrint jasperPrint = JasperFillManager.fillReport(
     reportFilePath, parameters, ds);
   exporter.setParameter(
     JRHtmlExporterParameter.IS_USING_IMAGES_TO_ALIGN,
     Boolean.FALSE);
   exporter
     .setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
   exporter
     .setParameter(JRExporterParameter.CHARACTER_ENCODING, "GBK");
   exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, oStream);
   exporter.exportReport();
   byte[] bytes = oStream.toByteArray();
   return bytes;
  } catch (JRException e) {
   throw new DemoException("Report Export Failed.");
  }
 }

到Excel:

public byte[] generateExcel(String begCustNo, String endCustNo,
   String reportTitle, String reportFilePath) throws DemoException {
  jdbcCustomerDao = new JdbcCustomerDao();
  Map parameters = new HashMap();
  parameters.put("ReportTitle", reportTitle);
  List list = jdbcCustomerDao.getAllCustomer(begCustNo, endCustNo);
  System.out.println("list size is :" + list.size());
  JRXlsExporter exporter = new JRXlsExporter(); // Excel
  ByteArrayOutputStream oStream = new ByteArrayOutputStream();
  try {
   JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
   JasperPrint jasperPrint = JasperFillManager.fillReport(
     reportFilePath, parameters, ds);
   exporter
     .setParameter(JRExporterParameter.JASPER_PRINT, jasperPrint);
   exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, oStream);
   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);
   exporter.exportReport();
   byte[] bytes = oStream.toByteArray();
   return bytes;

  } catch (JRException e) {
   throw new DemoException("Report Export Failed.");
  }
 }

jsp调用方法：

<%
     
    
 String filePath=getServletContext().getRealPath("/")+"report.jasper"; 

 CustomerServiceImpl  custs=new C