phpExcel导出excel的类，每步都有说明

 require_once WEB_PATH . '/lib/PHPExcel/PHPExcel.php';
 require_once WEB_PATH . '/lib/PHPExcel/PHPExcel/IOFactory.php';

 class ExcelExport{
     public static function export($orderList){
         $columnArr = array('A'=>20, 'B'=>20, 'C'=>'auto', 'D'=>'auto', 'E'=>'auto', 'F'=>'auto', 'G'=>'auto', 'H'=>6, 'I'=>'auto', 'J'=>10, 'K'=>10, 'L'=>10, 'M'=>10, 'N'=>10);

         $objPHPExcel = new PHPExcel();
         //设置属性
         $objPHPExcel->getProperties()->setCreator("gaoshikao@qq.com")
                                      ->setLastModifiedBy("gaoshikao@qq.com")
                                      ->setTitle("")
                                      ->setSubject("")
                                      ->setDescription("")
                                      ->setKeywords("")
                                      ->setCategory("");

         //设置标题
         $objPHPExcel->setActiveSheetIndex(0)
                     ->setCellValue('A1', '编号')
                     ->setCellValue('B1', '单号')
                     ->setCellValue('C1', '姓名')
                     ->setCellValue('D1', '街道')
                     ->setCellValue('E1', '城市')
                     ->setCellValue('F1', '州')
                     ->setCellValue('G1', '邮编')
                     ->setCellValue('H1', '国家')
                     ->setCellValue('I1', '联系电话')
                     ->setCellValue('J1', '中文品名')
                     ->setCellValue('K1', '英文品名')
                     ->setCellValue('L1', '内件件数')
                     ->setCellValue('M1', '商品重量')
                     ->setCellValue('N1', '申报金额');

         //设置列宽,邮编和电话为文本格式
         foreach($columnArr as $letter => $width){
             if($width == 'auto')$objPHPExcel->getActiveSheet()->getColumnDimension($letter)->setAutoSize(true);
             else $objPHPExcel->getActiveSheet()->getColumnDimension($letter)->setWidth($width);
         }

         //填充数据
         $currRow = 2;
         foreach($orderList as $key => $order){
             if($order['goods_count'] < 1)continue;

             $objPHPExcel->setActiveSheetIndex(0)
                 ->setCellValueExplicit('A'.$currRow, $order['sn'], PHPExcel_Cell_DataType::TYPE_STRING)
                 ->setCellValue('B'.$currRow, '')
                 ->setCellValue('C'.$currRow, $order['username'])
                 ->setCellValue('D'.$currRow, $order['street'].(empty($order['street2']) ? '' : "\n".$order['street2']))
                 ->setCellValue('E'.$currRow, $order['city'])
                 ->setCellValue('F'.$currRow, $order['state'])
                 ->setCellValueExplicit('G'.$currRow, $order['zipcode'], PHPExcel_Cell_DataType::TYPE_STRING)
                 ->setCellValue('H'.$currRow, $order['nation'])
                 ->setCellValueExplicit('I'.$currRow, $order['phone'], PHPExcel_Cell_DataType::TYPE_STRING)
                 ->setCellValue('J'.$currRow, '衣服')
                 ->setCellValue('K'.$currRow, 'clothes')
                 ->setCellValue('L'.$currRow, $order['goods_count'])
                 ->setCellValue('M'.$currRow, '')
                 ->setCellValue('N'.$currRow, '');

             $currRow++;
         }

         //文档名称
         $dateTip = date('Y-m-d');
         $objPHPExcel->getActiveSheet()->setTitle($dateTip);

         //设置第1个标签页为默认
         $objPHPExcel->setActiveSheetIndex(0);

         // Redirect output to a client’s web browser (Excel5)
         $filename = '订单-' . $dateTip . '.xls';
         header('Content-Type: application/vnd.ms-excel');
         header('Content-Disposition: attachment;filename="'.$filename.'"');
         header('Cache-Control: max-age=0');
         // If you're serving to IE 9, then the following may be needed
         header('Cache-Control: max-age=1');

         // If you're serving to IE over SSL, then the following may be needed
         header ('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past
         header ('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT'); // always modified
         header ('Cache-Control: cache, must-revalidate'); // HTTP/1.1
         header ('Pragma: public'); // HTTP/1.0

         $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
         $objWriter->save('php://output');
         exit;
     }
 }