Java File Download

Several ways to download Java files

PublicHttpServletResponse Download (String path, httpservletresponse response) {try{//path is the path to the file you want to download. File File = newFile (path);            Gets the file name. String filename =File.getname ();            Gets 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 (newFileInputStream (path)); byte[] buffer = new byte[Fis.available ()]; Fis.read (buffer); Fis.close (); Empty responseResponse.reset (); Set Response header Response.AddHeader ("Content-disposition", "attachment;filename=" + newString (Filename.getbytes ())); Response.AddHeader ("Content-length", "" "+File.length ()); OutputStream toclient = newBufferedoutputstream (Response.getoutputstream ()); Response.setcontenttype ("Application/octet-stream"); Toclient.write (buffer); Toclient.flush (); Toclient.close (); } catch(IOException ex) {Ex.printstacktrace ();} ReturnResponse } public void Downloadlocal (HttpServletResponse response) throwsFileNotFoundException {//download local file String fileName = "Operator.doc". toString ();//file default save name//read into stream inputstream instream = New FileInputStream ("C:/operator.doc");//file storage path//format outputResponse.reset (); Response.setcontenttype ("Bin"); Response.AddHeader ("Content-disposition", "attachment; Filename=\ "" + fileName + "\" "); Loop out the data in the stream byte[] b = new byte[100]; IntLen 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 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; wh Ile ((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 ()}}  

One way to support 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 mode 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 mode 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 (); }

　　

Java File Download