Results 1 to 10 of 10
  1. #1
    Join Date
    May 2012
    Posts
    15
    Rep Power
    0

    Default Trouble copying Image file from JAR directory

    Here's the code I'm using:

    Java Code:
     public void copyFile()throws IOException{
        	  File inputFile = new File("Default.png");
        	   File outputFile = new File("copy.png");
        	   FileReader in = new FileReader(inputFile);
        	   FileWriter out = new FileWriter(outputFile);
        	   int c;
    
        	   while ((c = in.read()) != -1)
        	     out.write(c);
    
        	   in.close();
        	   out.close();
        }
    Unfortunately, it isn't doing what its supposed to. I have an image file called "Default.png" in the directory where the JAR file is. I have another method confirming that it is able to find this file:

    Java Code:
    java.net.URL imageURL = getClass().getResource("Default.png");
    ImageIcon picture = new ImageIcon(imageURL);
    The method is supposed to make a copy of the file "Default.png" called "copy.png". The original snippet of code I got the method top method from actually had hard coded filepaths, e.g. "c://documents," but I need my program to be able to simply look for the file in whatever directory the JAR file is in - the default directory. I thought I'd beable to do that the same way I as I did in another method used to read Text files - by simply putting the name of the file. Not sure why this isn't working. Help is much appreciated. Hopefully I've explained the problem well enough.

  2. #2
    JosAH's Avatar
    JosAH is offline Moderator
    Join Date
    Sep 2008
    Location
    Voorschoten, the Netherlands
    Posts
    13,375
    Blog Entries
    7
    Rep Power
    20

    Default Re: Trouble copying Image file from JAR directory

    Is that image stored in your .jar file? If so, it isn't a file, it is a jar entry; you can get an input stream from that entry by using the getResourceAsStream( ... ) method; don't use Readers, they handle characters (including their encoding) not bytes.

    kind regards,

    Jos
    cenosillicaphobia: the fear for an empty beer glass

  3. #3
    Join Date
    May 2012
    Posts
    15
    Rep Power
    0

    Default Re: Trouble copying Image file from JAR directory

    Sorry, the file isn't actually in the .jar file, but the directory that the .jar file is in.

  4. #4
    doWhile is offline Moderator
    Join Date
    Jul 2010
    Location
    California
    Posts
    1,642
    Rep Power
    7

    Default Re: Trouble copying Image file from JAR directory

    As Tolls pointed out, don't use Reader/Writer. And to drive the point home, see the API
    FileWriter (Java Platform SE 6)
    And pay special attention to the following line:
    FileWriter is meant for writing streams of characters. For writing streams of raw bytes, consider using a FileOutputStream.
    A similar statement can be found on the FileReader API page.

  5. #5
    Join Date
    May 2012
    Posts
    15
    Rep Power
    0

    Default Re: Trouble copying Image file from JAR directory

    Swell, thanks! Here's the final code:

    Java Code:
     public void copyFile(String filenameoriginal, String filenamecopy)throws IOException{
        	   File destFile = new File(filenamecopy);
        	   if (!destFile.exists()) {
        	       destFile.createNewFile();
        	   }
    
        	   FileChannel fileSource = new FileInputStream(filenameoriginal).getChannel();
        	   FileChannel destination = new FileOutputStream(filenamecopy).getChannel();
        	   destination.transferFrom(fileSource, 0, fileSource.size());
    
        	   System.out.println("Success.");
        	   if (fileSource != null) {
        	       fileSource.close();
        	   }
        	   if (destination != null) {
        	       destination.close();
        	   }
        }

  6. #6
    Tolls is offline Moderator
    Join Date
    Apr 2009
    Posts
    11,856
    Rep Power
    19

    Default Re: Trouble copying Image file from JAR directory

    Quote Originally Posted by doWhile View Post
    As Tolls pointed out, don't use Reader/Writer.
    I did?
    ;)
    Please do not ask for code as refusal often offends.

    ** This space for rent **

  7. #7
    doWhile is offline Moderator
    Join Date
    Jul 2010
    Location
    California
    Posts
    1,642
    Rep Power
    7

    Default Re: Trouble copying Image file from JAR directory

    Quote Originally Posted by Tolls View Post
    I did?
    ;)
    Now that was a full on brain fart...I mean JosAH

  8. #8
    JosAH's Avatar
    JosAH is offline Moderator
    Join Date
    Sep 2008
    Location
    Voorschoten, the Netherlands
    Posts
    13,375
    Blog Entries
    7
    Rep Power
    20

    Default Re: Trouble copying Image file from JAR directory

    Quote Originally Posted by doWhile View Post
    Now that was a full on brain fart...I mean JosAH
    I did? ;-) I don't remember anything and I'll deny any accusations! I didn't do nothing! I was asleep! I mean, where am I? Who are you folks? Don't you stare at me that way! Help! I'm being oppressed!

    kind regards,

    Jos (innocent as always)
    cenosillicaphobia: the fear for an empty beer glass

  9. #9
    DarrylBurke's Avatar
    DarrylBurke is offline Member
    Join Date
    Sep 2008
    Location
    Madgaon, Goa, India
    Posts
    11,184
    Rep Power
    19

    Default Re: Trouble copying Image file from JAR directory

    Quote Originally Posted by doWhile View Post
    Now that was a full on brain fart...I mean JosAH
    Jos? He hasn't posted anything in this thread.

    db (exit, stage right)
    If you're forever cleaning cobwebs, it's time to get rid of the spiders.

  10. #10
    JosAH's Avatar
    JosAH is offline Moderator
    Join Date
    Sep 2008
    Location
    Voorschoten, the Netherlands
    Posts
    13,375
    Blog Entries
    7
    Rep Power
    20

    Default Re: Trouble copying Image file from JAR directory

    Quote Originally Posted by DarrylBurke View Post
    Jos? He hasn't posted anything in this thread.

    db (exit, stage right)
    See? See? I told you so. case closed.

    kind regards,

    Jos (runs ---------------------------------------------------------> that a'way)
    cenosillicaphobia: the fear for an empty beer glass

Similar Threads

  1. Replies: 0
    Last Post: 11-12-2011, 01:26 PM
  2. Trouble copying an array
    By xXRedneckXx in forum New To Java
    Replies: 10
    Last Post: 02-05-2011, 05:36 PM
  3. Trouble drawing image from file picked by JFileChooser
    By I = new NewToJava() in forum New To Java
    Replies: 6
    Last Post: 12-26-2010, 03:54 PM
  4. add to a zip file without copying it.
    By yurabita in forum New To Java
    Replies: 5
    Last Post: 08-21-2010, 03:16 AM
  5. problems copying a file
    By atom86 in forum Advanced Java
    Replies: 16
    Last Post: 10-01-2009, 02:40 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •