java下载本地文件

public static Boolean download(HttpServletResponse response,String localPath,String fileName){
		boolean flag = false;
		try {
            // path是指欲下载的文件的路径。
            File file = new File(localPath);
            // 以流的形式下载文件。
            InputStream fis = new BufferedInputStream(new FileInputStream(localPath));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            // 清空response
            response.reset();
            // 设置response的Header，此处要对中文进行编码处理。
            response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            response.addHeader("Content-Length", "" + file.length());
            OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
            response.setContentType("application/octet-stream");
            toClient.write(buffer);
            toClient.flush();
            toClient.close();
            flag = true;
        } catch (IOException ex) {
            ex.printStackTrace();
        }
		return flag;
	}