PersistenceManager.java 文件源码

private Object loadJNLP() throws UnavailableServiceException, IOException {

        Window frame = getFrame();

        // Get the JNLP service for opening files.
        FileOpenService fos = (FileOpenService)ServiceManager.lookup( "javax.jnlp.FileOpenService" );
        if( fos == null ) {
            throw new UnavailableServiceException( "JNLP FileOpenService is unavailable" );
        }

        // Read the configuration from a file.
        FileContents fc = fos.openFileDialog( _directoryName, null );
        if( fc == null ) {
            return null;
        }
        _directoryName = getDirectoryName( fc.getName() );

        // Convert the FileContents to an input stream.
        InputStream inputStream = fc.getInputStream();

        // XML-decode the input stream.
        Object object = null;
        XMLDecoder decoder = new XMLDecoder( inputStream );
        decoder.setExceptionListener( new ExceptionListener() {
            private int errors = 0;

            // Report the first recoverable exception.
            public void exceptionThrown( Exception e ) {
                if( errors == 0 ) {
                    showError( QWIResources.getString( "Load.error.decode" ), e );
                    errors++;
                }
            }
        } );
        object = decoder.readObject();
        decoder.close();

        return object;
    }