使用PHPExcel下载时获取损坏的xls文件

/** Error reporting */
if (PHP_SAPI == 'cli')
     die('This example should only be run from a Web Browser');

/** Include PHPExcel */
require_once '../Classes/PHPExcel.php';

// Create new PHPExcel object
$objPHPExcel = new PHPExcel();

// Set document properties
$objPHPExcel->getProperties()->setCreator("Maarten Balliauw")
      ->setLastModifiedBy("Maarten Balliauw")
      ->setTitle("PHPExcel Test Document")
      ->setSubject("PHPExcel Test Document")
      ->setDescription("Test document for PHPExcel,generated using PHP classes.")
      ->setKeywords("office PHPExcel php")
      ->setCategory("Test result file");

// Add some data
$objPHPExcel->setActiveSheetIndex(0)
         ->setCellValue('A1','Hello')
         ->setCellValue('B1','world!')
         ->setCellValue('C1','Hello')
         ->setCellValue('D1','world!');

// Miscellaneous glyphs,UTF-8
$objPHPExcel->setActiveSheetIndex(0)
            ->setCellValue('A2','Miscellaneous glyphs')
            ->setCellValue('B2','This is test text by me');

// Rename worksheet
$objPHPExcel->getActiveSheet()->setTitle('Simple');


// Set active sheet index to the first sheet,so Excel opens this as the first sheet
$objPHPExcel->setActiveSheetIndex(0);

// Redirect output to a client’s web browser (Excel5)
header("Content-Type: application/vnd.ms-excel");
header("Content-Disposition: attachment; filename="filename.xls"");
header("Cache-Control: max-age=0");

// Save Excel 2007 file
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel,'Excel5');
$objWriter->save(str_replace('.php','.xls',__FILE__));
$objWriter->save("php://output");
exit;

谢谢.