Shulou(Shulou.com)06/01 Report--

This article will explain in detail how to deal with the java file stream. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

The processing files of the java file stream are packaged into zip1, downloaded to the local public void download (HttpServletResponse response) {String filePath = ""; / / the file path String fileName = ""; / / the file name / / read into the stream InputStream inStream = new FileInputStream (filePath); / / set the format of the output response.reset (); response.setContentType ("bin"); response.addHeader ("Content-Disposition", "attachment") Filename=\ "+ fileName +"\ "); IOUtils.copy (inStream, response.getOutputStream ());} 2, java backend download

Method 1:

New URL (fileUrl + item.getcBhFileserver ()) .openStream ()

Method 2:

Public Boolean addFile (String url, String id, String fileName) {RequestCallback requestCallBack = new RequestCallback () {@ Override public void doWithRequest (ClientHttpRequest request) throws IOException {request.getHeaders () .add ("accept", MediaType.APPLICATION_OCTET_STREAM_VALUE);}} ResponseExtractor responseExtractor = new ResponseExtractor () {@ Override public Boolean extractData (ClientHttpResponse response) throws IOException {if (response.getStatusCode () = = HttpStatus.OK) {/ / get the file stream InputStream input = response.getBody (); return true;} return false }}; return restTemplate.execute (url, HttpMethod.GET, requestCallBack, responseExtractor, id);} 3. The file is packaged into zippublic void zipFilesAll () throws Exception {String zipPath = ""; / / zip package path String zipFileName = ""; / / zip package name File zipFile = new File (zipFileName. ToString ()); / / create FileOutputStream object FileOutputStream fileOutputStream = null / / create ZipOutputStream ZipOutputStream zipOutputStream = null; try {/ / create a folder zipFile = new File (zipPath); FileUtils.forceMkdir (zipFile); / / create a file zipFile = new File (zipFileName. ToString ()); if (! zipFile.exists ()) {zipFile.createNewFile () } / / instantiate FileOutputStream object fileOutputStream = new FileOutputStream (zipFileName.toString ()); / / instantiate ZipOutputStream object zipOutputStream = new ZipOutputStream (fileOutputStream); / / create ZipEntry object ZipEntry zipEntry = null For (CL cl: ClList) {/ / instantiate the ZipEntry object, the current file in the source file array zipEntry = new ZipEntry (tCltjjl.getcClmc () + ".zip"); zipOutputStream.putNextEntry (zipEntry); IOUtils.copy (new FileInputStream (cl.getcPath (), zipOutputStream) }} catch (Exception e) {} finally {/ / remember to delete files}} background multiple files are packaged into zip return streams the foreground provides one-click download button

Add QR code operations to project pom files, and maven support for file packaging:

Net.glxn.qrgen javase 2.0 org.apache.commons commons-compress 1.12

Foreground code:

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