/**

	 *  文件下载

	 * @param response

	 * @param downloadPath

	 * @param docName

	 */

	public void downLoadFile(

			HttpServletResponse response,String downloadPath, String docName) {

		response.setContentType("text/html;charset=utf-8");

		BufferedInputStream bis = null;

		BufferedOutputStream bos = null;

		File file = new File(downloadPath);

		try {

			response.addHeader("Content-Length", String.valueOf(file.length()));

			byte[] buff = new byte[2048];

			bis = new BufferedInputStream(new FileInputStream(file));

			bos = new BufferedOutputStream(response.getOutputStream());

			int bytesRead;

			while ((bytesRead = bis.read(buff, 0, buff.length)) != -1) {

				bos.write(buff, 0, buff.length);

			}

		} catch (IOException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		} finally {

			try {

				if(bis !=null){

					bis.close();

				}

			} catch (IOException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

			try {

				if(bos !=null){

					bos.close();

				}

			} catch (IOException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

			}

		}

	}

}