边压缩边下载197

后台代码

/**
 * 
 * @param request
 * @param response
 * @param urls 文件路径  格式   a.jpg,b.jpg...
 */
@ResponseBody
@RequestMapping(value = "downloadFilesZip", method = RequestMethod.POST)
public void downloadFilesZip(HttpServletRequest request, HttpServletResponse response, String urls){
    String[] split = null;
    if(com.ds.platform.core.util.StringUtils.isNotNull(urls)){
        split = urls.split(",");
    }else{
        return;
    }

    //响应头的设置
    response.reset();
    response.setCharacterEncoding("utf-8");
    response.setContentType("multipart/form-data");

    //设置压缩包的名字
    //解决不同浏览器压缩包名字含有中文时乱码的问题
    String downloadName = System.currentTimeMillis()+".zip";
    String agent = request.getHeader("USER-AGENT");
    try {
        if (agent.contains("MSIE")||agent.contains("Trident")) {
            downloadName = java.net.URLEncoder.encode(downloadName, "UTF-8");
        } else {
            downloadName = new String(downloadName.getBytes("UTF-8"),"ISO-8859-1");
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    response.setHeader("Content-Disposition", "attachment;fileName="" + downloadName + """);

    //设置压缩流：直接写入response，实现边压缩边下载
    ZipOutputStream zipos = null;
    try {
        zipos = new ZipOutputStream(new BufferedOutputStream(response.getOutputStream()));
        zipos.setMethod(ZipOutputStream.DEFLATED); //设置压缩方法
    } catch (Exception e) {
        e.printStackTrace();
    }

    //循环将文件写入压缩流
    DataOutputStream os = null;
    for(int i = 0; i < split.length; i++ ){
        String url = split[i];
        // editorImagePath真实路径(从配置文件读取) 
        File file = new File(editorImagePath+url);
        try {
            //添加ZipEntry，并ZipEntry中写入文件流
            //这里，加上i是防止要下载的文件有重名的导致下载失败
            zipos.putNextEntry(new ZipEntry(i + url.substring(url.lastIndexOf("/")+1)));
            os = new DataOutputStream(zipos);
            InputStream is = new FileInputStream(file);
            byte[] b = new byte[100];
            int length = 0;
            while((length = is.read(b))!= -1){
                os.write(b, 0, length);
            }
            is.close();
            zipos.closeEntry();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //关闭流
    try {
        os.flush();
        os.close();
        zipos.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

}

模拟表单提交

function openDownload () {
  let url ='/api/cms/article/downloadFilesZip'

  let form = $('<form></form>').attr('action', url).attr('method', 'post')

  let imgUrl = this.imgList
  const urlFix = '/ueditor/net'
  let urls = ''
//拼接url路径
  if (imgUrl && imgUrl.length > 0) {
    imgUrl.forEach(item => {
      let url = item.picture_image
      if (url.includes(urlFix)) {
//截取部分url路径  真实路径要在后台再拼接
        urls += url.substring(url.indexOf('word') + 4) + ','
      }
    })
    form.append($('<input/>').attr('type', 'hidden').attr('name', 'urls').attr('value', urls.substring(0, urls.lastIndexOf(','))))
    form.appendTo('body').submit().remove()
  }
}