Java implementation of file downloads in two ways

Public httpservletresponse Download (String path, httpservletresponse response) {try {//path refers to the file you want to download
            The path.
            File File = new file (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 as a stream.
            InputStream fis = new Bufferedinputstream (new FileInputStream (path));
            byte[] buffer = new byte[fis.available ()];
            Fis.read (buffer);
            Fis.close ();
            Empty response Response.reset (); Sets the header Response.AddHeader of the response ("Content-disposition", "attachment;filename=" + New String (filename.ge
            Tbytes ()));
            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 St Ring FileName = "Operator.doc". toString (); File's default save/read to stream InputStream instream = new FileInputStream ("C:/operator.doc");//File storage Path/settings
        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 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 (); }
    }

//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 way url u = new URL ("file:///" + FilePath);
            Response.setcontenttype (U.openconnection (). getContentType ()); Response.setheader ("content-disposition", "inline;
            Filename= "+ f.getname ());
            The filename 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 (); }