Codeigniter+PHPExcel导出Excel文件

1. 准备工作

下载PHPExcel：http://phpexcel.codeplex.com

这是个强大的Excel库，这里只演示导出Excel文件的功能，其中的大部分功能可能都用不着。

2. 安装PHPExcel到Codeigniter

1） 解压压缩包里的Classes文件夹中的内容到application\libraries\目录下，目录结构如下：

  -- application\libraries\PHPExcel.php

  -- application\libraries\PHPExcel (文件夹)

2）修改application\libraries\PHPExcel\IOFactory.php 文件

  -- 将其类名从PHPExcel_IOFactory改为IOFactory，遵从CI类命名规则。

  -- 将其构造函数改为public

3. 安装完毕，写一个导出excel的控制器（Controller）

代码如下：

<?php 
 
 class Table_export extends CI_Controller {
  
     function __construct()
     {
         parent::__construct();
  
         // Here you should add some sort of user validation
         // to prevent strangers from pulling your table data
     }
  
     function index($table_name)
     {
         $query = $this->db->get($table_name);
  
         if(!$query)
             return false;
  
         // Starting the PHPExcel library
         $this->load->library('PHPExcel');
         $this->load->library('PHPExcel/IOFactory');
  
         $objPHPExcel = new PHPExcel();
         $objPHPExcel->getProperties()->setTitle("export")->setDescription("none");
  
         $objPHPExcel->setActiveSheetIndex(0);
  
         // Field names in the first row
         $fields = $query->list_fields();
         $col = 0;
         foreach ($fields as $field)
         {
             $objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, 1, $field);
             $col++;
         }
  
         // Fetching the table data
         $row = 2;
         foreach($query->result() as $data)
         {
             $col = 0;
             foreach ($fields as $field)
             {
                 $objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, $row, $data->$field);
                 $col++;
             }
  
             $row++;
         }
  
         $objPHPExcel->setActiveSheetIndex(0);
  
         $objWriter = IOFactory::createWriter($objPHPExcel, 'Excel5');
  
         // Sending headers to force the user to download the file
         header('Content-Type: application/vnd.ms-excel');
         header('Content-Disposition: attachment;filename="Products_'.date('dMy').'.xls"');
         header('Cache-Control: max-age=0');
  
         $objWriter->save('php://output');
     }
  
 }

4. 测试

加入数据库有表名为products，此时可以访问http://www.yoursite.com/table_export/index/products 导出Excel文件了。

参考：http://www.dannyherran.com/2011/03/exporting-your-mysql-table-data-with-phpexcel-codeigniter/