Sets up a FileDialog box that lets the user choose a file. - Java Swing

Java examples for Swing:JDialog

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Description

Sets up a FileDialog box that lets the user choose a file.

Demo Code


import java.applet.*;
import java.awt.*;
import java.io.*;
import java.net.URL;
import java.net.URI;

public class Main{
    /**/*  www.ja va  2s .  com*/
     * Sets up a dialog box that lets the user choose a file.
     * Have to copy in the ComponentUtil.java class to use the "getParent"
     * which is necessary for our FileDialog 
     */
    static URL getSomeOldFile(Component C) {
        File myF = null;
        URL url = null;
        Frame dFrame = ComponentUtil.getParent(C);
        FileDialog myFDialog = new FileDialog(dFrame, "hiya");
        /* have to "import java.io.*;" to use FileDialog */;
        /* note: can append ",FileDialog.LOAD)" or ",FileDialog.SAVE)" to FileDialog constructor */;
        myFDialog.setVisible(true); // show(); deprecated
        try {
            myF = new File(myFDialog.getDirectory(), myFDialog.getFile());
        } catch (Exception exc) {
            System.out.println("Error opening file:" + exc);
        }
        ;
        try {
            url = myF.toURI().toURL();
        } catch (Exception e) {
            System.out.println("Error converting file to URL:" + myF + "\n"
                    + e);
        }
        return url;
    }
    public static Frame getParent(Component theComponent) {
        // this finds the topmost ancestor parent of a component,;;
        // so that we can give that parent to dialog constructors...;;
        Component currParent = theComponent;
        Frame theFrame = null;
        while (currParent != null) {
            if (currParent instanceof Frame) {
                theFrame = (Frame) currParent;
                break;
            }
            ;
            currParent = currParent.getParent();
        }
        ;
        return theFrame;
    }
}

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