/**
     * Export the workbook to the end-user.
     * 
     * Code obtained from: http://vaadin.com/forum/-/message_boards/view_message/159583
     * 
     * @return true, if successful
     */
    @Override
    public boolean sendConverted() {
        File tempFile;
        try {
            tempFile = File.createTempFile("tmp", ".xls");
            final FileOutputStream fileOut = new FileOutputStream(tempFile);
            workbook.write(fileOut);
            if (null == mimeType) {
                setMimeType(EXCEL_MIME_TYPE);
            }
            fileOut.flush(); // тут
            fileOut.close(); //тут
            return super.sendConvertedFileToUser(table.getApplication(), tempFile, exportFileName);
        } catch (final IOException e) {
            return false;
        }
    }

package com.vaadin.addon.tableexport;

import java.io.*;

/**
 * This input stream deletes the given file when the InputStream is closed; intended to be used with
 * temporary files.
 *
 * Code obtained from: http://vaadin.com/forum/-/message_boards/view_message/159583
 *
 */
class DeletingFileInputStream extends FileInputStream implements Serializable{

    /** The file. */
    protected File file = null;

    /**
     * Instantiates a new deleting file input stream.
     *
     * @param file
     *            the file
     * @throws FileNotFoundException
     *             the file not found exception
     */
    public DeletingFileInputStream(final File file) throws FileNotFoundException {
        super(file);
        this.file = file;
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.io.FileInputStream#close()
     */
    @Override
    public void close() throws IOException {
        super.close();
        file.delete(); //тут

    }
}

import com.vaadin.ui.Table;

private Table toExcel;
...
                ExcelExport excelExport = new ExcelExport(toExcel,"report");

                excelExport.excludeCollapsedColumns();
                excelExport.setDisplayTotals(false);
                excelExport.setExportFileName("outReport.xls");

                excelExport.export();