public void downloadCsv(List<RepairCatalogSearchResultsVO> rowDataList) throws CROSException{

		   try{ 

			   

				/*  File file = new File("D:csv/result/results.csv");

				  FileOutputStream out = new FileOutputStream(file);

				  OutputStreamWriter osw = new OutputStreamWriter(out);

				  BufferedWriter bw = new BufferedWriter(osw);*/

			   	  ServletOutputStream servletOutputStream = null;

			      FileInputStream input = null;

				  File file = null;

				  FileOutputStream out = null;

				  OutputStreamWriter osw = null;

				  BufferedWriter bw = null;

				//insert data 

				  String filePath = ((HttpServletRequest)FacesContext.getCurrentInstance().getExternalContext().getRequest()).getRealPath("/")

							+ "WEB-INF\\" + System.currentTimeMillis() + "_" + "results.csv";

					out = new FileOutputStream(filePath);

					osw = new OutputStreamWriter(out);

					bw =  new BufferedWriter(osw);

				  bw.write("ATA");

				  bw.write(",");

				  bw.write("componentDesc");

				  bw.write(" ") ;

				  bw.newLine();

				  Iterator<RepairCatalogSearchResultsVO> ite = rowDataList.iterator();

					while (ite.hasNext()) {

						RepairCatalogSearchResultsVO vo = ite.next();

						  bw.write(vo.getAtaNum());

						  bw.write(",");

						  bw.write(vo.getComponentDesc());

						  bw.write(" ") ;

						  bw.newLine();

					}

				  //close

					

					out.flush();

					out.close();

					

					//以下代码是用来下载文件时，由用户选择保存的地址。

					file = new File(filePath);

					HttpServletResponse httpServletResponse = (HttpServletResponse) FacesContext.getCurrentInstance().getExternalContext().getResponse();

					servletOutputStream = httpServletResponse.getOutputStream();

					httpServletResponse.setHeader("Content-disposition",

							"attachment; filename=" + "results.csv");

					httpServletResponse.setContentLength((int) file.length());

					httpServletResponse.setContentType("application/x-download");

					httpServletResponse.setContentType("application/csv");

					byte[] buffer = new byte[1024];

					int flag = 0;

					input = new FileInputStream(file);

					while ((flag = input.read(buffer)) > 0) {

						servletOutputStream.write(buffer, 0, flag);

					}

					servletOutputStream.flush();

					

				   bw.close();

				   osw.close();

				   out.close();

				   }

				  catch(Exception e){

				   e.printStackTrace() ;

				  }

				}