文件下载2

/**
	 * 下载
	 * @param path
	 * @param response
	 * @return
	 */
	@RequestMapping(value = "/download/{fileName}.{fileType}")
	  public HttpServletResponse  download(@PathVariable("fileName")String fileName,@PathVariable("fileType")String fileType, HttpServletResponse response) {
	        try {
	        	System.out.println("fileNamefileNamefileName"+fileName);
	            // path是指欲下载的文件的路径。
	        	HttpServletRequest request = ThreadLocalUtil.getRequest();
	        	
	        	File file = new File(request.getSession().getServletContext()
						.getRealPath("/") + "upload/guide/"+fileName+"."+fileType);
	            // 取得文件名。
	            String filename = file.getName();
	            // 取得文件的后缀名。
	            String ext = filename.substring(filename.lastIndexOf(".")+1).toUpperCase();
	         
	            // 以流的形式下载文件。
	            InputStream fis = new BufferedInputStream(new FileInputStream(request.getSession().getServletContext()
						.getRealPath("/") + "upload/guide/"+fileName+"."+fileType));
	            byte[] buffer = new byte[fis.available()];
	            fis.read(buffer);
	            fis.close();
	            // 清空response
	           response.reset();
	            // 设置response的Header
	           
	          response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes("UTF-8"),"ISO8859-1"));
	            response.addHeader("Content-Length", "" + file.length());
	            OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
	        response.setContentType("application/octet-stream");
	            toClient.write(buffer);
	            toClient.flush();
	            toClient.close();
	        } catch (IOException ex) {
	            ex.printStackTrace();
	        }
			return response;
	   
	    }