/**
 * 
 * @param list  導出的數據集合
 * @param request
 * @param response
 */

public static void exportExcel(List<Student> list, HttpServletRequest request,
      HttpServletResponse response) {
   HSSFWorkbook wb = new HSSFWorkbook();

   Sheet sheet = wb.createSheet();
   boolean flag = false;
   String headerTitle="編號,用戶名";  //表頭
 
   String[] headerTitles=headerTitle.split(",");
         try {
      Row row = sheet.createRow(0);
      
      for (int i = 0; i < headerTitles.length; i++) {             
         Cell cell = row.createCell(i);
         cell.setCellValue(headerTitles[i]);
      }


      for (int i = 0; i < list.size(); i++) {
 
         Row rowB = sheet.createRow(i + 1);
         Cell cellB1 = rowB.createCell(0);
         cellB1.setCellValue(list.get(i).getId());

         Cell cellB2 = rowB.createCell(1);
         cellB2.setCellValue(list.get(i).getUsername());

      }

      String filename = "文件名" + DateFormatUtils.formatDateTime(new Date()) + ".xls";
 
      if (wb != null) {
         if (response != null) {
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            response.setHeader("Content-Disposition",
                  "attachment;filename=\"" + new String(filename.getBytes("gb2312"), "ISO8859-1"));  //文件名中文需進行格式轉換，不然可能出現亂碼
            OutputStream out = response.getOutputStream();
            wb.write(out);
            out.close();
         }
      }
   } catch (Exception e) {
      e.printStackTrace();
   }
   
}

JAVA導出EXCEL