java多檔案打包下載下傳方法

/**
     * 根據檔案，進行壓縮，批量下載下傳
     * @param response
     * @param files 檔案轉換成的byte位元組流
     * @throws Exception 
     */
    public void downloadBatchByFile(HttpServletResponse response, Map<String, byte[]> files, String zipName){
        try{
            response.reset();
            zipName = java.net.URLEncoder.encode(zipName, "UTF-8");
            response.setContentType("application/vnd.ms-excel;charset=UTF-8");
            response.setHeader("Content-Disposition", "attachment;filename=" + zipName + ".zip");
            
            ZipOutputStream zos = new ZipOutputStream(response.getOutputStream());
            BufferedOutputStream bos = new BufferedOutputStream(zos);
            
            for(Entry<String, byte[]> entry : files.entrySet()){
                String fileName = entry.getKey();            //每個zip檔案名
                byte[]    file = entry.getValue();            //這個zip檔案的位元組
                
                BufferedInputStream bis = new BufferedInputStream(new ByteArrayInputStream(file));
                zos.putNextEntry(new ZipEntry(fileName));
                
                int len = 0;
                byte[] buf = new byte[10 * 1024];
                while( (len=bis.read(buf, 0, buf.length)) != -1){
                    bos.write(buf, 0, len);
                }
                bis.close();
                bos.flush();
            }
            bos.close();
        }catch(Exception e){
            e.printStackTrace();
        }
    }