Detailed Java file download several ways to implement _java

Java file downloads in several ways, as follows:

Public httpservletresponse Download (String path, httpservletresponse response) {try {//path is the path to the file you want to download.
      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.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 filen Ame = "Operator.doc". toString (); Default save name//read to stream InputStream instream = new FileInputStream ("C:/operator.doc");//file storage path//format of output re
    Sponse.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 Bytesu
    m = 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 ();
 }

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