PHPExcel创建一个新文件

I am trying to create a new Excel file by using PHPExcel library with this code :

   include ('/lib/PHPExcel/PHPExcel/IOFactory.php');
   include ('/lib/PHPExcel/PHPExcel.php');

   $objPHPExcel = new PHPExcel();
    $objPHPExcel->getProperties()
   ->setCreator("admin")
   ->setLastModifiedBy("admin")
   ->setTitle("Test")
   ->setSubject("template file")
   ->setDescription("template file")
   ->setKeywords("Prout");
   $objPHPExcel->setActiveSheetIndex(0);
   $objPHPExcel->getActiveSheet()->SetCellValue('A1', 'Hello');
   $objPHPExcel->getActiveSheet()->setTitle('Simple');
   $objWriter = new PHPExcel_Writer_Excel2007($objPHPExcel);
   $objWriter->save(dirname(__FILE__).'/file/test.xlsx');

The file is created, but when i try to open it my excel 2010 tells me there is unreadable content inside the file and i can't open it.

I tried a different way on a different forum but i am always arriving to the same result. I do this manipulation by using Ajax with jquery. Can this be the cause of this error?

I find how to resolve my problem ... but only half of it. Because it's work with this code :

 $objPHPExcel = new PHPExcel();
   $objPHPExcel->getProperties()
   ->setCreator("Temporaris")
   ->setLastModifiedBy("Temporaris")
   ->setTitle("Template Relevé des heures intérimaires")
   ->setSubject("Template excel")
   ->setDescription("Template excel permettant la création d'un ou plusieurs relevés d'heures")
   ->setKeywords("Template excel");
   $objPHPExcel->setActiveSheetIndex(0);
   $objPHPExcel->getActiveSheet()->SetCellValue('A1', "12");

   $writer = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');  
   header('Content-Type: application/vnd.ms-excel');
   header('Content-Disposition: attachment;filename="excel.xls"');
   header('Cache-Control: max-age=0');
   $writer->save('php://output');

But it's Excel5 not Excel2007 and when i remplace Excel5 by Excel2007 i have the same error message.

Did you try this ?

$objWriter = new PHPExcel_Writer_Excel2007($objPHPExcel);