java.awt.FileDialog#show ( )源码实例Demo

private void jMenuItem4ActionPerformed (java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jMenuItem4ActionPerformed
    // Add your handling code here:
    FileDialog fileDialog = new FileDialog (this, "Open...", FileDialog.LOAD);
    fileDialog.show ();
    if (fileDialog.getFile () == null)
        return;
    fileName = fileDialog.getDirectory () + File.separator + fileDialog.getFile ();

    FileInputStream fis = null;
    String str = null;
    try {
        fis = new FileInputStream (fileName);
        int size = fis.available ();
        byte[] bytes = new byte [size];
        fis.read (bytes);
        str = new String (bytes);
    } catch (IOException e) {
    } finally {
        try {
            fis.close ();
        } catch (IOException e2) {
        }
    }

    if (str != null)
        textBox.setText (str);
}
 

private void doSaveAs () {
    FileDialog fileDialog = new FileDialog (this, "Save As...", FileDialog.SAVE);
    fileDialog.show ();
    if (fileDialog.getFile () == null)
        return;
    fileName = fileDialog.getDirectory () + File.separator + fileDialog.getFile ();

    doSave (fileName);
}
 

/** Invoker for the saveas action */
public void saveAs() {
    Doc doc = getSelectedDoc();
    if (doc == null) {
        throw new NullPointerException ("no doc");
    }
    

    FileDialog fd = new FileDialog (MiniEdit.this, "Save as");
    fd.setMode(fd.SAVE);
    fd.show();
    if (fd.getFile() != null) {
        File nue = new File (fd.getDirectory() + fd.getFile());
        try {
            boolean success = nue.createNewFile();
            if (success) {
                FileWriter w = new FileWriter (nue);
                doc.getTextPane().write(w);
                file = nue;
                documentTabs.setTitleAt(documentTabs.getSelectedIndex(), nue.getName());
                documentTabs.setToolTipTextAt(documentTabs.getSelectedIndex(), nue.toString());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
 

/** This method is called when File -> Open menu item is invoked.
 * It displays a dialog to choose the file to be opened and edited.
 * @param evt ActionEvent instance passed from actionPerformed event.
 */
private void openMenuItemActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_openMenuItemActionPerformed
    FileDialog fileDialog = new FileDialog(this, "Open...", FileDialog.LOAD);
    fileDialog.show();
    if (fileDialog.getFile() == null)
        return;
    fileName = fileDialog.getDirectory() + File.separator + fileDialog.getFile();

    FileInputStream fis = null;
    String str = null;
    try {
        fis = new FileInputStream(fileName);
        int size = fis.available();
        byte[] bytes = new byte [size];
        fis.read(bytes);
        str = new String(bytes);
    } catch (IOException e) {
    } finally {
        try {
            fis.close();
        } catch (IOException e2) {
        }
    }

    if (str != null)
        textBox.setText(str);
}
 

/** Asks for a file name. then saves the current content of editor pane to the file.
 */
private void doSaveAs() {
    FileDialog fileDialog = new FileDialog(this, "Save As...", FileDialog.SAVE);
    fileDialog.show();
    if (fileDialog.getFile() == null)
        return;
    fileName = fileDialog.getDirectory() + File.separator + fileDialog.getFile();

    doSave(fileName);
}
 

public String rChooseFile(Rengine re, int newFile) {
	FileDialog fd = new FileDialog(new Frame(),
			(newFile == 0) ? "Select a file" : "Select a new file",
			(newFile == 0) ? FileDialog.LOAD : FileDialog.SAVE);
	fd.show();
	String res = null;
	if (fd.getDirectory() != null)
		res = fd.getDirectory();
	if (fd.getFile() != null)
		res = (res == null) ? fd.getFile() : (res + fd.getFile());
	return res;
}
 

/**
* Import to a jMusic score a standard MIDI file
* Assume the MIDI file name is the same as the score title with .mid appended
* prompt for a fileName
* @param Score
*/ 
public static void midi(Score score) {
    FileDialog fd = new FileDialog(new Frame(), 
                                   "Select a MIDI file to open.", 
                                   FileDialog.LOAD);
    fd.show();
    if (fd.getFile() != null) {
        Read.midi(score, fd.getDirectory() + fd.getFile());                
    }
}
 

/**
* Import the xml file as a jMusic score.
* Prompt for a fileName
* @param Score
*/ 
public static void xml(Score score) {
    FileDialog fd = new FileDialog(new Frame(), 
            "Select a jMusic XML file to open.", 
            FileDialog.LOAD);
    fd.show();
    if (fd.getFile() != null) {
        Read.xml(score, fd.getDirectory() + fd.getFile());                
    }
}
 

/**
* Save the jMusic score as a standard MIDI file
* Prompt user for a filename
* @param Score
*/ 
public static void midi(Score score) {
    FileDialog fd = new FileDialog(new Frame(), 
                                   "Save as a MIDI file ...", 
                                   FileDialog.SAVE);
    fd.setFile("jMusic_composition.mid");
    fd.show();
    if (fd.getFile() != null) {
        Write.midi(score, fd.getDirectory() + fd.getFile());                
    }
    
}
 

/**
* Dialog to import a MIDI file
*/
 public void openMidi() {
    Score s = new Score();
    FileDialog loadMidi = new FileDialog(this, "Select a MIDI file.", FileDialog.LOAD);
    loadMidi.setDirectory( lastDirectory );
    loadMidi.setFile( lastFileName );
    loadMidi.show();
    String fileName = loadMidi.getFile();
    if (fileName != null) {
        lastFileName = fileName;
        lastDirectory = loadMidi.getDirectory();                        
        Read.midi(s, lastDirectory + fileName);  
        setNewScore(s);
    }
}
 

/**
 * Dialog to import a jm file
 */
 
 public void openJM() {
    FileDialog loadjm = new FileDialog(this, "Select a jm score file.", FileDialog.LOAD);
    loadjm.setDirectory( lastDirectory );
    loadjm.show();
    String fileName = loadjm.getFile();
    if (fileName != null) {
        Score s = new Score();
        lastDirectory = loadjm.getDirectory();  
        Read.jm(s, lastDirectory + fileName);
        setNewScore(s);
    }
}
 

/**
 * Dialog to import a jm XML file
 */
 
 public void openJMXML() {
    FileDialog loadjmxml = new FileDialog(this, "Select a jMusic XML score file.", FileDialog.LOAD);
    loadjmxml.setDirectory( lastDirectory );
    loadjmxml.show();
    String fileName = loadjmxml.getFile();
    if (fileName != null) {
        Score s = new Score();
        lastDirectory = loadjmxml.getDirectory(); 
        Read.xml(s, lastDirectory + fileName);
        setNewScore(s);
    }
}
 

/**
 * Dialog to save phrase as a MIDI file.
 */
public void saveMidi() {
    FileDialog fd = new FileDialog(this, "Save as a MIDI file...",FileDialog.SAVE);
            fd.show();
                        
    //write a MIDI file and stave properties to disk
    if ( fd.getFile() != null) {
        Write.midi(score, fd.getDirectory()+fd.getFile());
        /*
        for(int i=0; i<staveArray.length; i++){
            System.out.println(i);
            StavePhraseProperties props =
                new StavePhraseProperties(
                        staveArray[i], staveArray[i].getPhrase());
            try {    
                System.out.println("props");
                props.writeToFile(                                         
                    fd.getDirectory()+fd.getFile());   
            }
            catch ( Throwable e) {
                System.out.println(
                    "Error Saving Properties " +
                    e.getMessage() );                                                
            }
        } 
        */
                                          
    }
}
 

/**
 * Dialog to save score as a jMusic serialized jm file.
 */
public void saveJM() {
    FileDialog fd = new FileDialog(this, "Save as a jm file...",FileDialog.SAVE);
            fd.show();
                        
    //write a MIDI file to disk
    if ( fd.getFile() != null) {
        Write.jm(score, fd.getDirectory()+fd.getFile());
    }
}
 

/**
 * Dialog to save score as a jMusic XML file.
 */
public void saveJMXML() {
    FileDialog fd = new FileDialog(this, "Save as a jMusic XML file...",FileDialog.SAVE);
            fd.show();
                        
    //write an XML file to disk
    if ( fd.getFile() != null) {
        Write.xml(score, fd.getDirectory()+fd.getFile());
    }
}
 

/**
* Get the first phrase from a MIDI file.
*/
public Phrase readMidiPhrase() {
    FileDialog loadMidi = new FileDialog(this, "Select a MIDI file.", FileDialog.LOAD);
    loadMidi.show();
    String fileName = loadMidi.getFile();
    Phrase phr = new Phrase(0.0);
    Score scr = new Score();
    if (fileName != null) {
        Read.midi(scr, loadMidi.getDirectory() + fileName); 
    }
    scr.clean();
    if (scr.size() > 0 && scr.getPart(0).size() > 0) phr = scr.getPart(0).getPhrase(0);
    //System.out.println("Size = " + phr.size());
    return phr;
}