java下载zip文件
1.参考API可见,Java的JDK中提供一个java.util.zip的接口。其压缩过程主要是通过这两个接口压缩文件或者文件夹;
java.util.zip.ZipEntry;
java.util.zip.ZipOutputStream;
2.功能实现
1)页面请求方式:
window.location.href = "/file/do_upload;
2) web端实现
@RequestMapping("/do_upload") public void test(HttpServletResponse response, String taskId) throws IOException { long start = System.currentTimeMillis(); // 获取附件信息 List<File> files = fileService.listAllFiles(fileId); //判断是否为excel类型文件 if(CollectionUtils.isEmpty(files)) { LOGGER.error("查询无关联图片或者视频"); } else { // 设置文件名 formatFileName(response, task); ZipOutputStream zos = null; try { zos = new ZipOutputStream(response.getOutputStream()); for (File srcFile : files) { if (StringUtils.isNotEmpty(srcFile.getFileHbasePath()) && StringUtils.isNotEmpty(srcFile.getFileName())) { // 下载附件 byte[] bytes = fastDFSService.downloadFile(srcFile.getFileHbasePath()); byte[] buf = new byte[1024]; zos.putNextEntry(new ZipEntry(srcFile.getFileName())); int len; ByteArrayInputStream in = new ByteArrayInputStream(bytes); while ((len = in.read(buf)) != -1){ zos.write(buf, 0, len); } zos.closeEntry(); } } long end = System.currentTimeMillis(); System.out.println("压缩完成,耗时:" + (end - start) +" ms"); } catch (Exception e) { throw new RuntimeException("zip error from ZipUtils",e); }finally{ if(zos != null){ try { zos.close(); } catch (IOException e) { e.printStackTrace(); } } } } }
设置文件名字和响应信息设置
/** * @methodname formatFileName * @Description {设置响应信息和格式化附件名字} * @author admin */ private void formatFileName(HttpServletResponse response) throws UnsupportedEncodingException { String fileName = "附件文字"; Long actualEndTime = new Date().getTime(); fileName += actualEndTime + ".zip"; // 获取浏览器信息 if (request.getHeader("User-Agent").toLowerCase().indexOf("firefox") > 0) { fileName = new String(fileName.getBytes("GB2312"),"ISO-8859-1"); } else { // 处理中文文件名的问题 fileName = java.net.URLEncoder.encode(fileName, "UTF-8"); fileName = new String(fileName.getBytes("UTF-8"), "GBK"); } // 清除首部的空白行 response.reset(); // 设置Response容器的编码 response.setCharacterEncoding("UTF-8"); // 不同类型的文件对应不同的MIME类型 response.setContentType("application/x-msdownload"); response.setHeader("Content-Disposition","attachment; filename="+fileName); }
参考原文地址:
获取游览器信息:https://blog.csdn.net/w410589502/article/details/73163383
压缩文件:https://blog.csdn.net/yunyingxiaoyi/article/details/103407789