jsp导出excel并支持分sheet导出的方法

public DownloadFile exportToExcel() throws Exception{
 String config_value = systemConfigService.getConfigValueByKey("Export.Xls");
 logger.info("获取的导出类型为execl表格"+",每页sheet导出的行数为:"+config_value+"行-------------------");
 File file = new File(new SimpleDateFormat("yyyy-MM-dd").format(new Date())+".xls");
 WritableWorkbook wbook = null ; WritableSheet wsheet =null;
 wbook = Workbook.createWorkbook(file); //建立excel文件 
 long startTime = System.currentTimeMillis();
 try {
  ExportToExcelSearchCondition condittion = ((ExportToExcelSearchCondition) ServletContext.currentSession().getAttribute("condittion"));
  List<ContentToExcel> cte = new ArrayList<ContentToExcel>();
  if(condittion == null){
   throw new Exception("session获取查询条件失败");
  }else{
   //根据条件查询需要导出的数据
   cte = category2ContentDAO.searchByCondition(condittion.getCategoryId(), condittion.getHSDFlag(),
     condittion.getExternalContentId(),condittion.getContentName(),condittion.getContentId(), condittion.getSystemId(), condittion.getState(),
     condittion.getCpId(),condittion.getContentType(),condittion.getBeforemodifyTime(),condittion.getAftermodifyTime());
  }
  logger.info("开始导出excel表格--");
  if(StringUtils.isNotBlank(config_value)){
    int value = NumberUtils.toInt(config_value);
   if( cte !=null && cte.size()>0 ){
   int k = 0;//分sheet的个数
   int i = 0;//用于循环Excel的行号
   Iterator<ContentToExcel> it = cte.iterator(); 
   Map<String,String> contentidAndContentTypeMap = new HashMap<String,String>(); 
   Map<String,String> contentIdAndDurationMap= new HashMap<String,String>();
   for (ContentToExcel contentToExcel : cte) {
    contentidAndContentTypeMap.put(contentToExcel.getContentId(), contentToExcel.getContentType());
   }
   //计算时长
   contentIdAndDurationMap = category2ContentDAO.getDurationByContentIdMap(contentidAndContentTypeMap);
   /**
   * 1)采用iterator迭代器进行迭代，与for循环相比可优化迭代效率。
   * 2)大量数据影响效率，求大数据量的解决办法。
   * add by guohua.yuan 2013-06-08
   */
   while(it.hasNext()){
    ContentToExcel contentToExcel = it.next();
    if( i % value == 0){
      wsheet = wbook.createSheet("节目单导出("+(int)(i/value+1)+")", (int)(i/value+1)); //工作表名称 
      //设置Excel字体 
      WritableFont wfont = new WritableFont(WritableFont.ARIAL, 10, WritableFont.BOLD, false, jxl.format.UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.BLACK); 
      WritableCellFormat titleFormat = new WritableCellFormat(wfont); 
      String[] title = { "标识","名称", "类型", "码流分档", "时长","快编人员" ,"初审人员","复审人员","终审人员","最后更新时间","内容创建时间","入库时间","状态"}; 
      //设置Excel表头 
      for (int j = 0; j < title.length; j++) { 
      Label excelTitle = new Label(j, 0, title[j], titleFormat); 
      wsheet.addCell(excelTitle); 
      } 
      k = k+1;
     }
      wsheet.addCell(new Label(0, i+1 -value*(k-1), contentToExcel.getContentId())); 
      wsheet.addCell(new Label(1, i+1 - value*(k-1), contentToExcel.getContentName()));
      if(contentToExcel.getContentType().equals("Serie")){
      wsheet.addCell(new Label(2, i+1 - value*(k-1), "电视剧单集")); 
      }else if(contentToExcel.getContentType().equals("Series")){
      wsheet.addCell(new Label(2, i+1 - value*(k-1), "连续剧")); 
      }else if(contentToExcel.getContentType().equals("Movie")){
      wsheet.addCell(new Label(2, i+1 - value*(k-1), "电影")); 
      }
      if(contentToExcel.getHSDFlag() == 1){
      wsheet.addCell(new Label(3, i+1 - value*(k-1), "标清")); 
      }else if(contentToExcel.getHSDFlag() == 2){
      wsheet.addCell(new Label(3, i+1 -value*(k-1), "高清")); 
      }else if(contentToExcel.getHSDFlag() == 3){
      wsheet.addCell(new Label(3, i+1 - value*(k-1), "超高清"));
      }
      //添加时长
      wsheet.addCell(new Label(4, i+1 - value*(k-1),contentIdAndDurationMap.get(contentToExcel.getContentId()))); 
      wsheet.addCell(new Label(5, i+1 - value*(k-1), contentToExcel.getKbPersonner())); 
      wsheet.addCell(new Label(6, i+1 - value*(k-1), contentToExcel.getCsPersonner())); 
      wsheet.addCell(new Label(7, i+1 - value*(k-1), contentToExcel.getFsPersonner())); 
      wsheet.addCell(new Label(8, i+1 - value*(k-1), contentToExcel.getZsPersonner())); 
      if(contentToExcel.getModifyTime()==null){
      wsheet.addCell(new Label(9, i+1 - value*(k-1), "")); 
      }else{
       wsheet.addCell(new Label(9, i+1 - value*(k-1), new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(contentToExcel.getModifyTime()))); 
      }
      if(contentToExcel.getCreateTime() == null){
       wsheet.addCell(new Label(10, i+1 - value*(k-1), "")); 
      }else{
       wsheet.addCell(new Label(10, i+1 - value*(k-1), new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(contentToExcel.getCreateTime()))); 
      }
      if(contentToExcel.getInstorageTime() ==null){
      wsheet.addCell(new Label(11,i+1 - value*(k-1),""));
      }else{
      wsheet.addCell(new Label(11,i+1 - value*(k-1),new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(contentToExcel.getInstorageTime())));
      }
      if(StringUtils.equals(contentToExcel.getStatus(), "1500")){
      wsheet.addCell(new Label(12, i+1 - value*(k-1), "成品就绪")); 
      }else if(StringUtils.equals(contentToExcel.getStatus(), "1700")){
      wsheet.addCell(new Label(12, i+1 - value*(k-1), "发布成功 ")); 
      }else if(StringUtils.equals(contentToExcel.getStatus(), "1800")){
      wsheet.addCell(new Label(12, i+1 - value*(k-1), "发布失败")); 
      }else if(StringUtils.equals(contentToExcel.getStatus(), "1901")){
      wsheet.addCell(new Label(12, i+1 - value*(k-1), "发布中")); 
      }
      i++;
   }
   wbook.write();//写入文件
   }else{
   throw new Exception("没有数据可导");
   }
  }else{
   throw new Exception("请检查系统配置管理是否配置导出类型的数据");
  }
 } catch (Exception e) {
  throw new Exception(e);
 }finally{
  if(wbook!=null){
   wbook.close();
  }
 }
 logger.info("导出excel耗时："+(System.currentTimeMillis() - startTime)+"ms");
 ServletContext.currentSession().removeAttribute("condittion");
 return new DownloadFile(file.getName()).readFrom(file);
}