JAVA中批量下载文件，将下载多个文件打包成zip文件下载。

 /**   * 文件下载
* @param request
* @param response
* @param filePath 文件路径
* @param filename 下载时文件名称
*/
    public static void downLoadFile(HttpServletRequest request,HttpServletResponse response,String filePath,String filename){
        try {
            File file=new File(filePath);
// 先去掉文件名称中的空格,然后转换编码格式为utf-8,保证不出现乱码,这个文件名称 用于浏览器的下载框中自动显示的文件名
            String userAgent =request.getHeader("User-Agent");
            if(userAgent.contains("MSIE")||userAgent.contains("Trident")){
                filename= java.net.URLEncoder.encode(filename,"UTF-8");
            }else{
                filename=new String(filename.getBytes("utf-8"),"iso8859-1");
            }
            response.addHeader("Content-Disposition", "attachment;filename=" +filename );
//response.setContentType("application/vnd.ms-excel");
            response.setContentType("multipart/form-data");
            byte[] b = new byte[1024];
            int len=0;
            FileInputStream fs=new FileInputStream(file);
            PrintWriter writer = response.getWriter();
            while ((len = fs.read()) != -1) {
                writer.write(len);
            }
            fs.close();
            writer.close();
        } catch (FileNotFoundException e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
// TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    //JAVA中批量下载文件，将下载多个文件打包成zip文件下载。
    //批量文件下载(将多个文件打包成zip包下载)
    @RequestMapping(value = "/downloadzipss/{attachIds}", method = {RequestMethod.POST, RequestMethod.GET})
    public  void batchDownLoadFile(@PathVariable String attachIds,HttpServletRequest request,HttpServletResponse response,String filename,String[] filepath,String[] documentname,String loginname){

        List<String> attachId = Arrays.asList(attachIds.split(","));
        List<Long> attachs = new ArrayList<Long>();
        attachId.forEach(it->{
            attachs.add(Long.valueOf(it));
        });
        List<CuxFndAttachmentDomain> cuxFndAttachmentList =cuxFndAttachmentService.findAttachmentByIds(attachs);
        byte[] buffer = new byte[1024];
        Date date=new Date();
        //生成zip文件存放位置
        String path = diskPath;
        String strZipPath = diskPath +"/"+date.getTime()+".zip";
        File file=new File(diskPath);
        if(!file.isDirectory() && !file.exists()){
            //创建单层目录
            // f.mkdir();
            // 创建多层目录
            file.mkdirs();
        }
        try {
            ZipOutputStream out = new ZipOutputStream(new FileOutputStream(strZipPath));
            for (CuxFndAttachment attach:cuxFndAttachmentList){
                String storageDomain =  attach.getAttachStorageDomain();
                String fileName = attach.getAttachName();
                if(ZHIYUAN_OA.equals(storageDomain)){
                    String attachZhiyuanOaId = attach.getAttachZhiyuanOaId();
                    InputStream inputStream = FlowFileUpDown.FileDw(attachZhiyuanOaId);
                    out.putNextEntry(new ZipEntry(fileName));
                    //设置压缩文件内的字符编码，不然会变成乱码
                    out.setEncoding("GBK");
                    int len;
                    // 读入需要下载的文件的内容，打包到zip文件
                    while ((len = inputStream.read(buffer)) > 0) {
                        out.write(buffer, 0, len);
                    }
                    out.closeEntry();
                }
            }
            out.close();
           // downLoadFile(request, response, strZipPath, strZipPath);
            // 5.设置下载下载头
            SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
            String filenames = URLEncoder.encode("批量下载文件" + format.format(Calendar.getInstance().getTime()) + ".zip", "UTF-8");
            response.setHeader("Content-Disposition", "attachment; fileName=" + filenames);
            response.setContentType("application/octet-stream; charset=utf-8");
            FileInputStream fileInputStream = null;
            fileInputStream = new FileInputStream(strZipPath);
             //下载文件
            FileCopyUtils.copy(fileInputStream, response.getOutputStream());
            File temp=new File(strZipPath);
            if(temp.exists()){
                temp.delete();
            }
        } catch (Exception e) {
            System.out.println("文件下载错误");
        }
    }