🚀 go-pugleaf

Take a look at this chunk of code.  I have a vector of URL objects that contain
filenames on some webserver.

I get the name of the url file, and transform it into a windows valid filename.
Then open a stream to the webserver, and just start reading bytes.  There are
more efficient ways of reading the file.  I wrote this when I first started
learning Java.  Now I would read a huge buffer, but you can figure this out.

Should do you well.  I can't believe that I commented it.  :)

John 


  protected void downloadImages()
  {
     StringBuffer fileName;
     int info;
     
     // ImgList is a vector of URL objects that contain jpeg files names.


     for( int x=0; x<ImgList.size(); x++ )
     {
        // create the file name to save this to.
        fileName = new StringBuffer( ((URL)ImgList.elementAt(x)).getHost() +
((URL)ImgList.elementAt(x)).getFile() );

        try
        {
           // create a proper file name
           for( int y=0; y<fileName.length(); y++)
              if( (fileName.charAt(y) == '/') || (fileName.charAt(y) == ':'))
                 fileName.setCharAt(y,'_');


           // create the buffered output file stream
           BufferedOutputStream webSaveFile = new BufferedOutputStream(
                                                new
FileOutputStream(filePath+fileName.toString() ) );

           // create the buffered input stream
           BufferedInputStream webStream = new BufferedInputStream(
((URL)ImgList.elementAt(x)).openStream(), 65536 );

           System.out.println(getName() + " Downloading(" + x + ")  " +
ImgList.elementAt(x) + "   to   " + fileName);

           // move throught the input stream one byte at a time
           // and put the byte into the output stream.
           while(  (info = webStream.read()) != -1 )
              webSaveFile.write( (byte)info );

           // count the number of images downloaded
           imagesDL++;

           webSaveFile.close();

//           yield();
        }
        catch( IOException e )
        {
           System.out.println("Error: " + e.getMessage() );
           System.out.println("  " + getName() + " IOException,     " +
((URL)ImgList.elementAt(x)) + "      " + filePath + fileName);
        }
     }

     // clear image list
     System.out.println("Clearing Image List");
     ImgList.removeAllElements();
  }

}// end of class




On Mon, 11 Mar 2002 17:58:39 +0100, "Laurent Souriau"
<lsouriau@club-internet.fr> wrote:

>        hi,
>
>
>I would like to know if it is possible to :
>
>- check existence of a  file on a  client side
>
>- download this file on the  client PC via http
>with java instructions ?
>
>If yes, how do you do it ?
>
>Thank you
>
>Laurent
>