Java纯代码实现导出文件为压缩包

/**
     * 下载压缩包
     * @param request
     * @param response
     * @param idDTO 传入文件id
     */
    @SneakyThrows
    @PostMapping("/download-zip")
    @ApiOperation(value = "下载文件为压缩包")
    public SwaggerAjaxResult downloadFileZip(HttpServletRequest request, HttpServletResponse response, @RequestBody @Valid UpdateFileDTO idDTO){
        return SwaggerAjaxResult.success(inspectionProblemService.downloadFileZip(request,response,idDTO.getId()));
    }

/**
     * 下载文件为压缩包
     *
     * @param request
     * @param response
     * @param id
     */
    @Override
    @Transactional(rollbackFor = Exception.class)
    public SwaggerAjaxResult downloadFileZip(HttpServletRequest request, HttpServletResponse response, String id) {
        try {
            List<TFile> fileVOList = fileService.lambdaQuery()
                    .eq(TFile::getParentId, id)
                    .eq(TFile::getParentTable, PROBLEM_TABLE_NAME)
                    .eq(TFile::getType, WJXX)
                    .list();
            Assert.notNull(fileVOList, "文件为空!");

            String fileName = super.baseMapper.getFileName(id);
            Assert.notNull(fileName, "文件名不能为空!");
            //创建临时路径，存放压缩文件
            String zipFilePath = System.getProperty("user.dir") + File.separator + "downloadZip" + File.separator;
            log.info("文件临时路径为:{}", zipFilePath);
            //如果文件不存在创创建新文件
            File zipFile = new File(zipFilePath);
            if (!zipFile.exists()) {
                zipFile.mkdirs();
            }
            //在临时文件夹里创建临时文件
            String temporaryZipName = zipFilePath + "临时存放.zip";
            //如果不存在就新创建一个
            File zipFiles = new File(temporaryZipName);
            if (!zipFiles.exists()) {
                zipFiles.createNewFile();
            }

            //压缩输出流，将临时文件输出流包装成压缩流,将所有文件输出到这里,打成zip包
            ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(temporaryZipName));
            //将文件写入压缩包
            for (TFile file : fileVOList) {
                writingFilesToZip(zipFilePath, zipOut, file, request);
            }
            //压缩完成关闭压缩流
            zipOut.close();
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "utf-8") + ".zip");
            response.setCharacterEncoding("UTF-8");
            response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
            ServletOutputStream outputStream = response.getOutputStream();
            FileInputStream inputStream = new FileInputStream(temporaryZipName);
            IOUtils.copy(inputStream, outputStream);
            //关闭输入流
            inputStream.close();
            //下载完成，删除临时文件
            File file = new File(zipFilePath);

            FileUtils.deleteFile(file);
            log.info("下载zip成功！");
            return SwaggerAjaxResult.success("下载zip成功！");
        } catch (IOException e) {
            e.printStackTrace();
            log.warn("下载zip失败!{}", e.getMessage());
            return SwaggerAjaxResult.error("下载zip失败!{}", e.getMessage());
        }
    }

/**
     * @param zipFilePath
     * @param zipOut
     * @param fileVO
     */
    private void writingFilesToZip(String zipFilePath, ZipOutputStream zipOut, TFile fileVO, HttpServletRequest request) throws IOException {
        String savePath = fileVO.getFileLink();
        //通过URL将文件下载至本地
        downLoadFromUrl(savePath, zipFilePath, fileVO.getFileName(), request);
        byte[] buf = new byte[2 * 1024];
        String srcDir = zipFilePath + fileVO.getFileName();
        File sourceFile = new File(srcDir);
        zipOut.putNextEntry(new ZipEntry(fileVO.getFileName()));
        int len;
        FileInputStream in = new FileInputStream(sourceFile);
        while ((len = in.read(buf)) != -1) {
            zipOut.write(buf, 0, len);
        }
        zipOut.closeEntry();
        in.close();

    }

private void downLoadFromUrl(String savePath, String zipFilePath, String fileName, HttpServletRequest request) throws IOException {
        File file1 = new File(savePath);
        byte[] getData = new byte[0];
        try {
            getData = org.apache.commons.io.FileUtils.readFileToByteArray(file1);
        } catch (IOException e) {
            log.warn("文件:{}不能访问!", savePath);
        }
        //文件保存位置
        File saveDir = new File(zipFilePath);
        if (!saveDir.exists()) {
            saveDir.mkdir();
        }

        File file = new File(saveDir + File.separator + fileName);
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(getData);
        fos.close();
    }