【SpringBoot多文件压缩zip浏览器下载】

通过浏览器下载文件(返回文件流)

• 下载文件到本地(下载文件，返回base64数据流，再将数据流转换为文件)

 /**
 * 批量下载附件
 */
public void batchDownloadDoc(HttpServletResponse response）{
 	 /**
     * 批量下载文件路径
     */
 public static final String DOWLOAD_FILE_PATH = "D:\\bathFile";
    /**
     * 将bathDocFile目录下的所有文件目录打包到d:/bathDocFile.zip
     */
 public static final String BATH_FILE_PATH = "D:/bathFile";
//先删除临时存在的文件夹
FileUtils.deleteDirectory(Constants.BATH_FILE_PATH);
//通过fileId下载文件
FileVO download = fileService.download(fileId);
FileUtils.base64ToFile(download.getFileBase64(),download.getFileName());
//调用批量下载签名文件方法
this.downloadDataZip(response);
}	

/**
* base64转换为文件，放入文件目录
* @param base64
* @param name
*/
    public static void base64ToFile(String base64, String name) {
        File file = null;
        //创建文件目录
        String filePath = Constants.DOWLOAD_FILE_PATH;
        File dir = new File(filePath);
        if (!dir.exists() && !dir.isDirectory()) {
            dir.mkdirs();
        }
        BufferedOutputStream bos = null;
        java.io.FileOutputStream fos = null;
        try {
            byte[] bytes = Base64.getDecoder().decode(base64);
            file = new File(filePath + "\\" + name);
            fos = new java.io.FileOutputStream(file);
            bos = new BufferedOutputStream(fos);
            bos.write(bytes);
        } catch (Exception e) {
            log.error(e.getMessage());
        } finally {
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e) {
                    log.error(e.getMessage());
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    log.error(e.getMessage());
                }
            }
        }
    }

/**
 * 批量下载签名文件
 */
    private void downloadDataZip(HttpServletResponse response) throws IOException {
    	//调用hutool的压缩zip文件的工具类(打包文件夹，压缩成ZIP文件，放入本地) 
    	File zip = ZipUtil.zip(Constants.BATH_FILE_PATH);
        InputStream inputStream = FileUtils.fileToInputStream(zip);
        //调用文件下载方法
        this.downloadFile(response, inputStream);
    }

	/**
     * 下载文件流
     *
     * @param response
     * @param inputData
     * @throws IOException
     */
    public void downloadFile(HttpServletResponse response, InputStream inputData) throws IOException {
        //放到缓冲流里面
        BufferedInputStream bins = new BufferedInputStream(inputData);
        //获取文件输出IO流
        OutputStream outs = response.getOutputStream();
        BufferedOutputStream bouts = new BufferedOutputStream(outs);
        response.setContentType("application/x-download");
        response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
        response.setHeader("Content-disposition", "attachment;filename=" + URLEncoder.encode("压缩文件", "UTF-8") + ".zip");
        int bytesRead = 0;
        byte[] buffer = new byte[8192];
        //开始向网络传输文件流
        while ((bytesRead = bins.read(buffer, 0, 8192)) != -1) {
            bouts.write(buffer, 0, bytesRead);
        }
        //这里一定要调用flush()方法
        bouts.flush();
        inputData.close();
        bins.close();
        outs.close();
        bouts.close();
    }

前端调用下载接口，直接浏览器下载压缩文件即可。