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Delete nested folder in JSP?

Posted on 2002-07-01
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Last Modified: 2010-07-27
How to delete a nested folder that contains files/sub folders in JSP?

thanks.
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Question by:trowa
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Expert Comment

by:mraible
ID: 7121845
Same way you would in java.

Look at java.io.File in the Javadocs.

http://java.sun.com/j2se/1.3/docs/api/java/io/File.html

You should be able to delete a file or directory with the "delete" method.
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Accepted Solution

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cheekycj earned 200 total points
ID: 7121885
I found this in a FAQ:

public void nuke(File path)
   throws IOException
{
   File[] files = path.listFiles();

   for(int i=0; i<files.length; ++i)
   {
      if(files[i].isDirectory())
         nuke(files[i]);

      files[i].delete();
   }
}

its pretty much a recursive method that will delete a directory and all its files and sub-dirs.

call it using:
nuke("/path/to/dir/to/delete");

HTH,
CJ
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Author Comment

by:trowa
ID: 7126368
CJ, thanks again. The nuke function above work well, but it didn't delete the folder itself. Let's say:

i call nuke("\a");

all the sub-folder and files in a folder is deleted, but the a folder itself is not deleted.

Maybe you can show me how to delete the a folder also inside the Nuke function above.

and why when i compare a String value, i must use:

if (strvalue.equals("abc")) {
//
}

but not if (strvalue == "abc") {
//
}

?

Is this the syntax of Java? what's their difference?

Thanks :)
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Expert Comment

by:cheekycj
ID: 7127040
you can just after you call the nuke function do this:

nuke(path);
File dirToDelete = new File(path);
path.delete();

string1.equals(string2) or even
string1.equalsIgnoreCase(string2) are the way to compare strings in java b/c the String object has those methods implemented to compare the values whereas the "==" operator on Objects (Strings are Objects) compares if the two objects are pointing to the same memory reference.  Big Difference :-)

Here is a good link that explains this:
http://www.michael-thomas.com/java/javacert/JCP_ObjectEqual.htm

HTH,
CJ

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Author Comment

by:trowa
ID: 7131361
Thanks a lot again, CJ :)
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LVL 19

Expert Comment

by:cheekycj
ID: 7131762
Glad I could help and Thanx for the "A".

CJ
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