关于phpexcel有关问题

关于phpexcel问题
在本地运行。导出excel都没问题，但是部署到服务器上就没反应了，看了网上类似注销//require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/ZipStreamWrapper.php';也没作用，以下是导出代码，各位大神谢谢给出意见：

      //excel导出
    function excel(){
    require_once './Classes/PHPExcel.php';
    require_once './Classes/PHPExcel/IOFactory.php';
    $u = D('clients');   
    $data=$_SESSION['datas'];

    $objPHPExcel = new PHPExcel();
    // Set properties
    $objPHPExcel->getProperties()->setCreator("ctos")
    ->setLastModifiedBy("ctos")
    ->setTitle("Office 2007 XLSX Test Document")
    ->setSubject("Office 2007 XLSX Test Document")
    ->setDescription("Test document for Office 2007 XLSX, generated using PHP classes.")
    ->setKeywords("office 2007 openxml php")
    ->setCategory("Test result file");

    //set width
    $objPHPExcel->getActiveSheet()->getColumnDimension('A')->setWidth(8);
    $objPHPExcel->getActiveSheet()->getColumnDimension('B')->setWidth(10);
    $objPHPExcel->getActiveSheet()->getColumnDimension('C')->setWidth(25);
    $objPHPExcel->getActiveSheet()->getColumnDimension('D')->setWidth(12);
    $objPHPExcel->getActiveSheet()->getColumnDimension('E')->setWidth(50);
    $objPHPExcel->getActiveSheet()->getColumnDimension('F')->setWidth(10);
    $objPHPExcel->getActiveSheet()->getColumnDimension('G')->setWidth(12);
    $objPHPExcel->getActiveSheet()->getColumnDimension('H')->setWidth(12);
    $objPHPExcel->getActiveSheet()->getColumnDimension('I')->setWidth(12);
     $objPHPExcel->getActiveSheet()->getColumnDimension('J')->setWidth(30);

     //设置行高度
     $objPHPExcel->getActiveSheet()->getRowDimension('1')->setRowHeight(22);

     $objPHPExcel->getActiveSheet()->getRowDimension('2')->setRowHeight(20);

     //set font size bold
     $objPHPExcel->getActiveSheet()->getDefaultStyle()->getFont()->setSize(10);
     $objPHPExcel->getActiveSheet()->getStyle('A2:J2')->getFont()->setBold(true);

     $objPHPExcel->getActiveSheet()->getStyle('A2:J2')->getAlignment()->setVertical(PHPExcel_Style_Alignment::VERTICAL_CENTER);
     $objPHPExcel->getActiveSheet()->getStyle('A2:J2')->getBorders()->getAllBorders()->setBorderStyle(PHPExcel_Style_Border::BORDER_THIN);

     //设置水平居中
     $objPHPExcel->getActiveSheet()->getStyle('A1')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_LEFT);
     $objPHPExcel->getActiveSheet()->getStyle('A')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
     $objPHPExcel->getActiveSheet()->getStyle('B')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
     $objPHPExcel->getActiveSheet()->getStyle('D')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
     $objPHPExcel->getActiveSheet()->getStyle('F')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
     $objPHPExcel->getActiveSheet()->getStyle('G')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
     $objPHPExcel->getActiveSheet()->getStyle('H')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);
     $objPHPExcel->getActiveSheet()->getStyle('I')->getAlignment()->setHorizontal(PHPExcel_Style_Alignment::HORIZONTAL_CENTER);

     //
     $objPHPExcel->getActiveSheet()->mergeCells('A1:J1');

     // set table header content
     $objPHPExcel->setActiveSheetIndex(0)
     ->setCellValue('A1', '客户目录')
     ->setCellValue('A2', '客户编号')
     ->setCellValue('B2', '客户名称')
     ->setCellValue('C2', '地区')
     ->setCellValue('D2', '客户状态')
     ->setCellValue('E2', '项目分类')
     ->setCellValue('F2', '客户来源')
     ->setCellValue('G2', '操作人')
     ->setCellValue('H2', '更新时间')
     ->setCellValue('I2', '电话')
     ->setCellValue('J2', '单位');

     // Miscellaneous glyphs, UTF-8
     for($i=0;$i<count($data);$i++){
     $objPHPExcel->getActiveSheet(0)->setCellValue('A'.($i+3), $data[$i]['cnum']);

     // print_r( $data[$i]['cnum']);exit;
     $objPHPExcel->getActiveSheet(0)->setCellValue('B'.($i+3),  $data[$i]['cname']);
     $objPHPExcel->getActiveSheet(0)->setCellValue('C'.($i+3), $data[$i]['carea']);
     $objPHPExcel->getActiveSheet(0)->setCellValue('D'.($i+3),  $data[$i]['ctrade']);
     $objPHPExcel->getActiveSheet(0)->setCellValue('E'.($i+3),  $data[$i]['crecords']);
     $objPHPExcel->getActiveSheet(0)->setCellValue('F'.($i+3), $data[$i]['csource']);
     $objPHPExcel->getActiveSheet(0)->setCellValue('G'.($i+3),  $data[$i]['coperator']);
     $objPHPExcel->getActiveSheet(0)->setCellValue('H'.($i+3),  $data[$i]['cutime']);
     $objPHPExcel->getActiveSheet(0)->setCellValue('I'.($i+3),  $data[$i]['cphone']);
     $objPHPExcel->getActiveSheet(0)->setCellValue('J'.($i+3), $data[$i]['cunit']);
     $objPHPExcel->getActiveSheet()->getStyle('A'.($i+3).':J'.($i+3))->getAlignment()->setVertical(PHPExcel_Style_Alignment::VERTICAL_CENTER);
     $objPHPExcel->getActiveSheet()->getStyle('A'.($i+3).':J'.($i+3))->getBorders()->getAllBorders()->setBorderStyle(PHPExcel_Style_Border::BORDER_THIN);
     $objPHPExcel->getActiveSheet()->getRowDimension($i+3)->setRowHeight(16);
     }
     //print_r($objPHPExcel);exit;

     // Rename sheet
     $objPHPExcel->getActiveSheet()->setTitle('客户汇总表');


     // 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)

     //  iconv('utf-8", "gb2312", $filename);
     //header("Content-type: text/csv");
     header('Content-Type: application/vnd.ms-excel');
     header('Content-Disposition: attachment;filename="('.date('Ymd-His').').xls"');
     header('Cache-Control: max-age=0');

     $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');

        $objWriter->save('php://output');  
    
    } phpexcel?导出?linux
[解决办法]
一点一点的调试，是不是路径没写对？