文件下载ZipOutputStream批量OutputStream单个文件下载图片到本地

1.使用ZipOutputStream批量打包文件到本地

demo&＃xff1a;

&＃64;RestController
&＃64;RequestMapping("download")
&＃64;Slf4j
public class DownLoadController {&＃64;RequestMapping("test")public void test(HttpServletResponse response) {try {String nowTimeString &＃61; "ll";//文件的名称String downloadFilename &＃61; nowTimeString &＃43; ".zip";//转换中文否则可能会产生乱码downloadFilename &＃61; URLEncoder.encode(downloadFilename, "UTF-8");// 指明response的返回对象是文件流response.setContentType("application/octet-stream");// 设置在下载框默认显示的文件名response.setHeader("Content-Disposition", "attachment;filename&＃61;" &＃43; downloadFilename);ZipOutputStream zos &＃61; new ZipOutputStream(response.getOutputStream());ArrayList<String> files &＃61; Lists.newArrayList("http://***/commodity_qrcode/qrcode_test/1983207019.jpg", "http://****/commodity_qrcode/qrcode_test/1979780937.jpg", "http://***/commodity_qrcode/qrcode_test/1979780935.jpg","http://***/commodity_qrcode/qrcode_test/1979780934.jpg", "http://****/commodity_qrcode/qrcode_test/1152809.jpg", "http://****/commodity_qrcode/qrcode_test/1152808.jpg","http://***/commodity_qrcode/qrcode_test/1152807.jpg","https://****/lll/test/2020-12/memo/f86dc6ba7a7642ac83f9f4409af2227e.jpg");for (int i &＃61; 0; i < files.size(); i&＃43;&＃43;) {URL url &＃61; new URL(files.get(i));//目录不能重复&＃xff0c;否则会duplicate entry: ll///因此需要加个时间戳或者是uuid作为后缀//也可以根据文件地址作为目录&＃xff0c;会自动根据路径分区文件夹&＃xff0c;一个/一个文件目录zos.putNextEntry(new ZipEntry("ll/" &＃43; i&＃43; ".jpg"));//此时会自动分级目录&＃xff0c;
// zos.putNextEntry(new ZipEntry(files.get(i));InputStream fis &＃61; url.openConnection().getInputStream();byte[] buffer &＃61; new byte[1024];int r &＃61; 0;while ((r &＃61; fis.read(buffer)) !&＃61; -1) {zos.write(buffer, 0, r);}fis.close();}//强制把数据输出&＃xff0c;清空缓存区&＃xff0c;(必须要&＃xff0c;因为一部分数据还在缓冲区)//面向缓冲区的&＃xff0c;不强制输出就关闭&＃xff0c;数据可能不完整//最后再关闭读写流调用close()就完成了zos.flush();//关闭输出流zos.close();} catch (Exception e) {log.error("下载失败", e);}}}


结果: 1.根据url分目录

2.自定义目录

2.OutputStream单个文件下载图片到本地

demo

&＃64;RestController
&＃64;RequestMapping("download")
&＃64;Slf4j
public class DownLoadController {&＃64;RequestMapping("singleQrCode")public void getSingleQrCode(HttpServletResponse response, String imgUrl) {try {String downloadFilename &＃61; "new url";downloadFilename &＃61; URLEncoder.encode(downloadFilename, "UTF-8");response.setContentType("application/octet-stream");response.setHeader("Content-Disposition", "attachment;filename&＃61;" &＃43; downloadFilename);response.setHeader("FileName", downloadFilename);OutputStream outputStream &＃61; response.getOutputStream();URL url &＃61; new URL(imgUrl);InputStream fis &＃61; url.openConnection().getInputStream();byte[] buffer &＃61; new byte[1024];int r;while ((r &＃61; fis.read(buffer)) !&＃61; -1) {outputStream.write(buffer, 0, r);}fis.close();outputStream.flush();outputStream.close();} catch (IOException e) {log.warn("品牌商二维码下载失败{}", JSON.toJSONString(imgUrl), e);}}