jfilechooser - set directory to a path in a file

问题:

I am trying to set the directory path in JFilechooser through something like this(using commons-io ) :

String fileContents = IOUtils.toString(new FileInputStream("path.txt"));
File theDirectory = new File(fileContents);

filechooser = new JFileChooser();
fileChooser.setCurrentDirectory(theDirectory);
filechooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

I'm using getCanonicalPath() to get the path and write in the file path.txt

path = file.getCanonicalPath();

I don't intend to put all my code here,but I'm sure that the program writes and reads the path in path.txt. I don't get any error,but everytime I run the program it always open JFilechooser in my documents folder.What i am doing wrong?

回答1:

Try to pass the current directory directly in the constructor:

filechooser = new JFileChooser(theDirectory);

回答2:

If you consult the API, using the default constructor (i.e. new JFileChooser()):

Constructs a JFileChooser pointing to the user's default directory. This default depends on the operating system. It is typically the "My Documents" folder on Windows, and the user's home directory on Unix.

This would seem to account for always opening to My Documents, but this isn't your problem. In fact, your problem lies with setting the current directory (i.e. setCurrentDirectory(theDirectory)):

Sets the current directory. Passing in null sets the file chooser to point to the user's default directory. This default depends on the operating system. It is typically the "My Documents" folder on Windows, and the user's home directory on Unix. If the file passed in as currentDirectory is not a directory, the parent of the file will be used as the currentDirectory. If the parent is not traversable, then it will walk up the parent tree until it finds a traversable directory, or hits the root of the file system.

That being said, I'd pay attention to the highlighted text since it appears that you're setting a file as the current directory and not a directory.

回答3:

For select the last directory that you open :

chooser.setCurrentDirectory(lastDirectory);

int r = chooser.showOpenDialog(new JPanel());

if (r == JFileChooser.APPROVE_OPTION) {
   fileName = chooser.getSelectedFile().getPath();
   lastDirectory = chooser.getSelectedFile();
}

回答4:

JFileChooser Chooser = new JFileChooser("F:");

回答5:

In your main class declare

public static String dirpath=".";

private void btnBrowseActionPerformed(java.awt.event.ActionEvent evt) {    
 JFileChooser jfc = new JFileChooser(dirpath);
 dirpath =jfc.getSelectedFile().getAbsolutePath().toString();
}

回答6:

if you want to change the directory theb use System.getProperty method

String s=System.getProperty("user.dir");  // changes directory from documents to the user current Directory;

JFileChooser jfc=new JFileChooser(s);