为什么小弟我这段生成csv文件的代码，上载好文件之后，输出的是jsp对应的html页面呢

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() ;
				  }
				}