当前路径：Classes/PHPExcel/Writer/Excel2007/Workbook.php
<?php

/**
 * PHPExcel_Writer_Excel2007_Workbook
 *
 * Copyright (c) 2006 - 2015 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version    ##VERSION##, ##DATE##
 */
class PHPExcel_Writer_Excel2007_Workbook extends PHPExcel_Writer_Excel2007_WriterPart
{
    /**
     * Write workbook to XML format
     *
     * @param     PHPExcel    $pPHPExcel
     * @param    boolean        $recalcRequired    Indicate whether formulas should be recalculated before writing
     * @return     string         XML Output
     * @throws     PHPExcel_Writer_Exception
     */
    public function writeWorkbook(PHPExcel $pPHPExcel = null, $recalcRequired = false)
    {
        // Create XML writer
        $objWriter = null;
        if ($this->getParentWriter()->getUseDiskCaching()) {
            $objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
        } else {
            $objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_MEMORY);
        }

        // XML header
        $objWriter->startDocument('1.0', 'UTF-8', 'yes');

        // workbook
        $objWriter->startElement('workbook');
        $objWriter->writeAttribute('xml:space', 'preserve');
        $objWriter->writeAttribute('xmlns', 'http://schemas.openxmlformats.org/spreadsheetml/2006/main');
        $objWriter->writeAttribute('xmlns:r', 'http://schemas.openxmlformats.org/officeDocument/2006/relationships');

        // fileVersion
        $this->writeFileVersion($objWriter);

        // workbookPr
        $this->writeWorkbookPr($objWriter);

        // workbookProtection
        $this->writeWorkbookProtection($objWriter, $pPHPExcel);

        // bookViews
        if ($this->getParentWriter()->getOffice2003Compatibility() === false) {
            $this->writeBookViews($objWriter, $pPHPExcel);
        }

        // sheets
        $this->writeSheets($objWriter, $pPHPExcel);

        // definedNames
        $this->writeDefinedNames($objWriter, $pPHPExcel);

        // calcPr
        $this->writeCalcPr($objWriter, $recalcRequired);

        $objWriter->endElement();

        // Return
        return $objWriter->getData();
    }

    /**
     * Write file version
     *
     * @param     PHPExcel_Shared_XMLWriter $objWriter         XML Writer
     * @throws     PHPExcel_Writer_Exception
     */
    private function writeFileVersion(PHPExcel_Shared_XMLWriter $objWriter = null)
    {
        $objWriter->startElement('fileVersion');
        $objWriter->writeAttribute('appName', 'xl');
        $objWriter->writeAttribute('lastEdited', '...