批量下载文件，将文件打包成压缩文件

绝地灬酷狼 2022-03-30 02:38 380阅读 0赞

批量压缩文件

public static byte[] zipFiles(List<File> listfiles) throws IOException {
            byte[] buf = new byte[1024];
            ByteArrayOutputStream outPut = new ByteArrayOutputStream();
            ZipOutputStream out = new ZipOutputStream(outPut);
            List<String> nameList = new ArrayList<>();
            for (File file : listfiles) {
                InputStream input = new ByteArrayInputStream(file.getContent());
    
                if (nameList.size() > 0 && CommonUtil.existsStrList(nameList, file.getFileName())) {
                    out.putNextEntry(new ZipEntry(CommonUtil.returnChangeFileName(file.getFileName(), nameList.size())));
                } else {
                    nameList.add(file.getFileName());
                    out.putNextEntry(new ZipEntry(file.getFileName()));
                }
    
                int len;
                while ((len = input.read(buf)) > 0) {
                    out.write(buf, 0, len);
                }
                out.closeEntry();
                input.close();
            }
            out.close();
            return outPut.toByteArray();
        }

输出压缩后的文件

public Message downloadAll(Message msg) throws IOException {
            Message m = new Message();
    
            FileDto dto = getParamBean(msg, FileDto.class);
            // idList 为file的idlist
            List<File> list = fileService.getFileList(dto.getFileIdList());
            byte[] byteInfo = null;
            if (list != null) {
                byteInfo = ZIPUtils.zipFiles(list);
            }
            String fileName = new String((CommonUtil.uuid() + ".zip").getBytes("UTF-8"), "ISO-8859-1");
            m.setBody(byteInfo);
            m.setStatus(HttpStatus.HTTP_OK);
            m.setHead(Message.CONTENT_LENGTH, byteInfo.length + "");
            m.setHead("Content-Disposition", "attachment;filename=\"" + fileName
                    + "\"");
            return m;
        }