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(); 
        }