Spring mvc 字节流

     public static void responseDownloadFile(HttpServletRequest request, HttpServletResponse response, File file) throws Exception {
         if(file != null && file.length() > 0){
             response.setContentType("x-download;charset=UTF-8");              // 显示文件类型      Microsoft Excel 逗号分隔值文件
 //            response.setContentType("text/html;charset=UTF-8");              // 显示文件类型     360 Chrome HTML Document
 //            response.setContentType("application/csv;charset=UTF-8");       // 显示文件类型      Microsoft Excel 逗号分隔值文件

             request.setCharacterEncoding("UTF-8");
             response.addHeader("Content-disposition", "attachment; filename="+ new String(file.getName().getBytes(), "ISO8859-1"));     // 解决文件名乱码问题，及文件名中的中文被自动去除问题
             response.addHeader("Content-Length", String.valueOf(file.length()));  

             BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
             BufferedOutputStream bos =  new BufferedOutputStream(response.getOutputStream());  

             byte[] buff = new byte[4096];
             int bytesRead;
             while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                 bos.write(buff, 0, bytesRead);
             }  

             bis.close();
             bos.close();
         }