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Searching & Setting Directories in Java

Posted on 2003-12-08
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Last Modified: 2010-03-31
Hello i am producing a java program and in my program it involves chosing a directory to search for different file types.  Currently, i have created the code to search for a file, now i just need to edit this code in order to set a directory in which to search.

public class directory extends JFrame implements ActionListener
{
FileDialog f = new FileDialog(this, "Choose A Folder To Search For Files", FileDialog.LOAD); // Loads the file select box
}

public void actionPerformed(ActionEvent e)
{
 if(e.getSource() == rootDir){
f.setDirectory("M:\\Year 2");       // If root directory is selected go here
f.setVisible(true);
 }

So all i basiclly need to do is to select a dirctoty and subdirectories not files.

Thanks Ian.
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Comment
Question by:ian_willo
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16 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 9896703
set the FileDialog.DIRECTORIES_ONLY flag
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Expert Comment

by:jimmack
ID: 9896711
>> select a dirctoty

You could get the selected directory (in the FileDialog) into a File object using:

File selectedDir = f.getDirectory();

listFiles() will give you a list of files and directories from a given directory.

You can then use isDirectory() on each entry to see if it is a directory or not.
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Author Comment

by:ian_willo
ID: 9896713
What do you mean.  how do i implement that in my code??????????
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Expert Comment

by:jimmack
ID: 9896727
Who are you asking?
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LVL 86

Expert Comment

by:CEHJ
ID: 9896734
You should stick to Swing if you're generally using Swing:

JFileChooser fileChooser = new JFileChooser(file);
    fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
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Author Comment

by:ian_willo
ID: 9896738
either of you i dont understand what you mean. Only been doing java for about 1 and a half months
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Expert Comment

by:CEHJ
ID: 9896744
Here are some useful chooser examples

http://javaalmanac.com/egs/javax.swing.filechooser/pkg.html
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Author Comment

by:ian_willo
ID: 9896760
CEHJ where do i put this code mate
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Expert Comment

by:jimmack
ID: 9896784
When you have selected the directory from either the JFileChooser or FileDialog, you want a File object.  From a JFileChooser, you can call getSelectedFile(), from FileDialog, you can call getDirectory(), but this only returns a String:

JFileChooser (let's call it jfc):

File selectedDir = jfc.getSelectedFile();

FileDialog (from your example - f)

File selectedDir = new File(f.getDirectory());

Now you have the File you can get the files/directories that it contains.  You can either create a filter for this method (to only return directories), or you can search the returned array for directories:

File[] dirContent = selectedDir.listFiles();

for (int i = 0; i < dirContent.length; i++)
{
    if (dirContent[i].isDirectory())
    {
    }
    else  // must be a file
    {
    }
}
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Accepted Solution

by:
CEHJ earned 100 total points
ID: 9896796
Wherever you want to show the dialog, e.g.

void showDialog() {
JFileChooser chooser = new JFileChooser();
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
     
    int returnVal = chooser.showOpenDialog(this);
    if(returnVal == JFileChooser.APPROVE_OPTION) {
       System.out.println("You chose to open this directory: " +
            chooser.getSelectedFile().getName());
    }

}
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Author Comment

by:ian_willo
ID: 9896799
let me explain a bit more.  I have two buutons called movies and pictures.  Also a root dircetory button.  I want to click the root dir button to set the directory.  Then click the movies button to display mpgs and the pictures to display bmps.
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Expert Comment

by:CEHJ
ID: 9896816
Just call my code from actionPerformed. The API docs show how to set filters:

http://java.sun.com/j2se/1.4.2/docs/api/javax/swing/JFileChooser.html
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Expert Comment

by:jimmack
ID: 9896819
Does the root dir button open the file choosing dialog?

Where are the other buttons?

You might want to consider closing your old question: http://www.experts-exchange.com/Programming/Programming_Languages/Cplusplus/Q_20776870.html
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Expert Comment

by:CEHJ
ID: 9896826
If you want to set a root, create the chooser with a String representing where the root is (see API doc)
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Expert Comment

by:jimmack
ID: 9896885
And here is an example of a FileFilter that the listFiles method can use to retrieve specified files from a directory:

private class MyFilter implements FileFilter
{
    private String suffix;

    public boolean accept(File pathname)
    {
        return (pathname.getName().endsWith(suffix));
    }

    public MyFilter(String suffix)
    {
        this.suffix = suffix;
    }
}

You could then get the .mpg files in a directory using:

File[] mgpFiles = currentDirectory.listFiles(new MyFilter("mpg"));
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Expert Comment

by:CEHJ
ID: 9911562
8-)
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