Several ways to download Java files, as follows:
public HttpServletResponse download(String path, HttpServletResponse response) { try { // path refers to the path of the file to be downloaded. File file = new File(path); // Get the file name. String filename = file.getName(); // Get the suffix name of the file. String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase(); // Download the file in the form of a stream. InputStream fis = new BufferedInputStream(new FileInputStream(path)); byte[] buffer = new byte[fis.available()]; fis.read(buffer); fis.close(); // Clear response response response.reset(); // Set the response's Header response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes())); response.addHeader("Content-Length", "" + file.length()); OutputStream toClient = new BufferedOutputStream(response.getOutputStream()); response.setContentType("application/octet-stream"); toClient.write(buffer); toClient.flush(); toClient.close(); } catch (IOException ex) { ex.printStackTrace(); } return response; } public void downloadLocal(HttpServletResponse response) throws FileNotFoundException { // Download local file String fileName = "Operator.doc".toString(); // The default save name of the file// Read InputStream inStream = new FileInputStream("c:/Operator.doc");// The file storage path// Set the format of the output response.reset(); response.setContentType("bin"); response.addHeader("Content-Disposition", "attachment; filename=/"" + fileName + "/""); // Loop out the data in the stream byte[] b = new byte[100]; int len; try { while ((len = inStream.read(b)) > 0) response.getOutputStream().write(b, 0, len); inStream.close(); } catch (IOException e) { e.printStackTrace(); } } public void downloadNet(HttpServletResponse response) throws MalformedURLException { // Download the network file int bytesum = 0; int byteread = 0; URL url = new URL("windine.blogdriver.com/logo.gif"); try { URLConnection conn = url.openConnection(); InputStream inStream = conn.getInputStream(); FileOutputStream fs = new FileOutputStream("c:/abc.gif"); byte[] buffer = new byte[1204]; int length; while ((byteread = inStream.read(buffer)) != -1) { bytesum += byteread; System.out.println(bytesum); fs.write(buffer, 0, byteread); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } }//A way to open files online
public void downLoad(String filePath, HttpServletResponse response, boolean isOnLine) throws Exception { File f = new File(filePath); if (!f.exists()) { response.sendError(404, "File not found!"); return; } BufferedInputStream br = new BufferedInputStream(new FileInputStream(f)); byte[] buf = new byte[1024]; int len = 0; response.reset(); // Very important if (isOnLine) { // Online Open Method URL u = new URL("file:////" + filePath); response.setContentType(u.openConnection().getContentType()); response.setHeader("Content-Disposition", "inline; filename=" + f.getName()); // The file name should be encoded as UTF-8 } else { // Pure download method response.setContentType("application/x-msdownload"); response.setHeader("Content-Disposition", "attachment; filename=" + f.getName()); } OutputStream out = response.getOutputStream(); while ((len = br.read(buf)) > 0) out.write(buf, 0, len); br.close(); out.close(); }The above is all the content of this article. I hope it will be helpful to everyone's learning and I hope everyone will support Wulin.com more.