在PHP中强制文件下载 - 在Joomla框架内

时间：2010-11-10 20:58:14

标签： php joomla download

我有一些PHP代码在数据库上运行查询，将结果保存到csv文件，然后允许用户下载文件。问题是，csv文件包含围绕实际csv内容的页面HTML。

我已经阅读了所有相关问题，包括this one。不幸的是我的代码存在于Joomla中，所以即使我尝试重定向到只包含标题的页面，Joomla也会自动用自己的导航代码包围它。这只发生在下载时;如果我查看保存在服务器上的csv文件，它不包含HTML。

任何人都可以帮我一个强制下载实际csv文件的方法，因为它在服务器上，而不是浏览器正在编辑它？我已尝试使用标头位置，如下所示：

header('Location: ' . $filename);

但它会在浏览器中打开文件，而不是强制保存对话框。

这是我目前的代码：

//set dynamic filename
$filename = "customers.csv";
//open file to write csv
$fp = fopen($filename, 'w');

//get all data
$query = "select 
   c.firstname,c.lastname,c.email as customer_email, 
   a.email as address_email,c.phone as customer_phone,
   a.phone as address_phone,
   a.company,a.address1,a.address2,a.city,a.state,a.zip, c.last_signin
   from {$dbpre}customers c
   left  join  {$dbpre}customers_addresses a  on c.id = a.customer_id  order by c.last_signin desc";

$votes = mysql_query($query) or die ("File: " . __FILE__ . "<br />Line: " . __LINE__ . "<p>{$query}<p>" . mysql_error());
$counter = 1;
while ($row = mysql_fetch_array($votes,1)) {
    //put header row
    if ($counter == 1){
       $headerRow = array();
       foreach ($row as $key => $val)
          $headerRow[] = $key;
       fputcsv($fp, $headerRow);
    }
    //put data row
    fputcsv($fp, $row);
    $counter++;
}

//close file
fclose($fp);

//redirect to file
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=".$filename);
header("Content-Transfer-Encoding: binary");
readfile($filename); 
exit;

EDITS 完整网址如下所示：

http://mysite.com/administrator/index.php?option=com_eimcart&task=customers

实际下载链接如下所示：

http://mysite.com/administrator/index.php?option=com_eimcart&task=customers&subtask=export

更多编辑 这是代码所在页面的一个镜头;生成的文件仍在拉入子菜单的html。所选链接的代码（导出为CSV）现在是

index.php?option=com_eimcart&task=customers&subtask=export&format=raw

alt text

现在，这是生成的已保存文件的屏幕截图：

alt text

在此处上传期间收缩，但以黄色突出显示的文本是subnav的html代码（列出客户，添加新客户，导出为csv）。这就是我的完整代码现在的样子;如果我能摆脱最后一点的HTML，那将是完美的。

  $fp= fopen("php://output", 'w');

            $query = "select c.firstname,c.lastname,c.email as customer_email, 
                      a.email as address_email,c.phone as customer_phone,
                      a.phone as address_phone,  a.company, a.address1,
                      a.address2,a.city,a.state,a.zip,c.last_signin

                      from {$dbpre}customers c
                      left  join  {$dbpre}customers_addresses a on c.id = a.customer_id  
                      order by c.last_signin desc";

            $votes = mysql_query($query) or die ("File: " . __FILE__ . "<br />Line: " . __LINE__ . "<p>{$query}<p>" . mysql_error());
            $counter = 1;

            //redirect to file
            header("Content-type: application/octet-stream");
            header("Content-Disposition: attachment; filename=customers.csv");
             header("Content-Transfer-Encoding: binary");

            while ($row = mysql_fetch_array($votes,1)) {

                    //put header row
                    if ($counter == 1){
                            $headerRow = array();
                            foreach ($row as $key => $val)
                                    $headerRow[] = $key;

                            fputcsv($fp, $headerRow);
                    }

                    //put data row
                    fputcsv($fp, $row);
                $counter++;
            }

            //close file
            fclose($fp);

BJORN更新

这是代码（我认为）对我有用。在调用操作的链接中使用RAW参数：

index.php?option=com_eimcart&task=customers&subtask=export&format=raw

因为这是程序性的，我们的链接位于名为customers.php的文件中，如下所示：

switch ($r['subtask']){
    case 'add':
    case 'edit':
        //if the form is submitted then go to validation
                include("subnav.php");
        if ($r['custFormSubmitted'] == "true")
            include("validate.php");
        else
            include("showForm.php");
        break;

    case 'delete':
                include("subnav.php");
        include("process.php");
            break;

    case 'resetpass':
                include("subnav.php");
        include("resetpassword");
            break;

    case 'export':
        include("export_csv.php");
            break;


    default:
                include("subnav.php");
        include("list.php");
        break;
}

因此，当用户点击上面的链接时，会自动包含export_csv.php文件。该文件包含所有实际代码：

<?
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=customers.csv");
header("Content-Transfer-Encoding: binary");
$fp= fopen("php://output", 'w');


//get all data
$query = "select 
    c.firstname,c.lastname,c.email as customer_email, 
    a.email as address_email,c.phone as customer_phone,
    a.phone as address_phone,
    a.company,a.address1,a.address2,a.city,a.state,a.zip, c.last_signin

    from {$dbpre}customers c

    left  join  {$dbpre}customers_addresses a  on c.id = a.customer_id  order by c.last_signin desc";


$votes = mysql_query($query) or die ("File: " . __FILE__ . "<br />Line: " . __LINE__ . "<p>{$query}<p>" . mysql_error());
$counter = 1;

while ($row = mysql_fetch_array($votes,1)) {

    //put header row
    if ($counter == 1){
        $headerRow = array();
        foreach ($row as $key => $val)
            $headerRow[] = $key;

        fputcsv($fp, $headerRow);
    }

    //put data row
    fputcsv($fp, $row);
    $counter++;
}

//close file
fclose($fp);

4 个答案:

答案 0 :(得分：3)

这是我刚刚编写的一段示例代码，可以帮助您解决问题。将它用作控制器中的操作方法。

function get_csv() {
        $file = JPATH_ADMINISTRATOR . DS . 'test.csv';

        // Test to ensure that the file exists.
        if(!file_exists($file)) die("I'm sorry, the file doesn't seem to exist.");

        // Send file headers
        header("Content-type: text/csv");
        header("Content-Disposition: attachment;filename=test.csv");

        // Send the file contents.
        readfile($file);
    }

仅此一项是不够的，因为您下载的文件仍将包含周围的html。要摆脱它并且只接收csv文件的内容，您需要在请求中添加format = raw参数。在我的例子中，该方法在com_csvexample组件内，因此url将是：

/index.php?option=com_csvexample&task=get_csv&format=raw

修改

为了避免使用中间文件替换

//set dynamic filename
$filename = "customers.csv";
//open file to write csv
$fp = fopen($filename, 'w');

与

//open the output stream for writing
//this will allow using fputcsv later in the code
$fp= fopen("php://output", 'w');

使用此方法，您必须在将任何内容写入输出之前移动发送标头的代码。您也不需要调用readfile函数。

答案 1 :(得分：3)

将此方法添加到您的控制器：

function exportcsv() {
  $model = & $this->getModel('export');
  $model->exportToCSV();
}

然后添加一个名为export.php的新模型，代码如下。您需要根据自己的情况更改或扩展代码。

<?php
/**
* @package TTVideo
* @author Martin Rose
* @website www.toughtomato.com
* @version 2.0
* @copyright Copyright (C) 2010 Open Source Matters. All rights reserved.
* @license http://www.gnu.org/copyleft/gpl.html GNU/GPL
*/

//No direct acesss
defined('_JEXEC') or die();
jimport('joomla.application.component.model');
jimport( 'joomla.filesystem.file' );
jimport( 'joomla.filesystem.archive' );
jimport( 'joomla.environment.response' );

class TTVideoModelExport extends JModel 
{

  function exportToCSV() {
    $files = array();
    $file = $this->__createCSVFile('#__ttvideo');
    if ($file != '') $files[] .= $file;
    $file = $this->__createCSVFile('#__ttvideo_ratings');
    if ($file != '') $files[] .= $file;
    $file = $this->__createCSVFile('#__ttvideo_settings');
    if ($file != '') $files[] .= $file;
    // zip up csv files to be delivered
    $random = rand(1, 99999);
    $archive_filename = JPATH_SITE.DS.'tmp'.DS.'ttvideo_'. strval($random) .'_'.date('Y-m-d').'.zip';
    $this->__zip($files, $archive_filename);
    // deliver file
    $this->__deliverFile($archive_filename);
    // clean up
    JFile::delete($archive_filename);
    foreach($files as $file) JFile::delete(JPATH_SITE.DS.'tmp'.DS.$file);
  }

  private function __createCSVFile($table_name) {
    $db = $this->getDBO();
    $csv_output = '';

    // get table column names
    $db->setQuery("SHOW COLUMNS FROM `$table_name`");
    $columns = $db->loadObjectList();

    foreach ($columns as $column) {
      $csv_output .= $column->Field.'; ';
    }
    $csv_output .= "\n";

    // get table data
    $db->setQuery("SELECT * FROM `$table_name`");
    $rows = $db->loadObjectList();
    $num_rows = count($rows);
    if ($num_rows > 0) {
      foreach($rows as $row) {
        foreach($row as $col_name => $value) {
          $csv_output .= $value.'; ';
        }
        $csv_output .= "\n";
      }
    }
    $filename = substr($table_name, 3).'.csv';
    $file = JPATH_SITE.DS.'tmp'.DS.$filename;
    // write file to temp directory
    if (JFile::write($file, $csv_output)) return $filename;
    else return '';
  }

  private function __deliverFile($archive_filename) {
    $filesize = filesize($archive_filename);
    JResponse::setHeader('Content-Type', 'application/zip');
    JResponse::setHeader('Content-Transfer-Encoding', 'Binary');
    JResponse::setHeader('Content-Disposition', 'attachment; filename=ttvideo_'.date('Y-m-d').'.zip');
    JResponse::setHeader('Content-Length', $filesize);
    echo JFile::read($archive_filename);
  }

  /* creates a compressed zip file */
  private function __zip($files, $destination = '') {
    $zip_adapter = & JArchive::getAdapter('zip'); // compression type
    $filesToZip[] = array();
    foreach ($files as $file) {
      $data = JFile::read(JPATH_SITE.DS.'tmp'.DS.$file); 
      $filesToZip[] = array('name' => $file, 'data' => $data); 
    }
    if (!$zip_adapter->create( $destination, $filesToZip, array() )) {
      global $mainframe; 
      $mainframe->enqueueMessage('Error creating zip file.', 'message'); 
    }
  }


}
?>

然后转到默认的view.php并添加自定义按钮，例如

// custom export to set raw format for download
$bar = & JToolBar::getInstance('toolbar');
$bar->appendButton( 'Link', 'export', 'Export CSV', 'index.php?option=com_ttvideo&task=export&format=raw' );
祝你好运！

答案 2 :(得分：0)

您可以使用Apache的mod_cern_meta将HTTP标头添加到静态文件中。 Content-Disposition: attachment。 PHP可以创建所需的.htaccess和.meta文件。

答案 3 :(得分：0)

在Joomla应用程序中输出CSV数据的另一种方法是使用CSV而不是HTML格式创建视图。也就是说，按如下方式创建文件：

组件/ com_mycomp /视图/东西/ view.csv.php

并添加类似于以下内容：

<?php
// No direct access
defined('_JEXEC') or die;

jimport( 'joomla.application.component.view');

class MyCompViewSomething extends JViewLegacy // Assuming a recent version of Joomla!
{        
    function display($tpl = null)
    {
        // Set document properties
        $document   = &JFactory::getDocument();
        $document->setMimeEncoding('text/csv');

        JResponse::setHeader('Content-disposition', 'inline; filename="something.csv"', true);

        // Output UTF-8 BOM
        echo "\xEF\xBB\xBF";

        // Output some data
        echo "field1, field2, 'abc 123', foo, bar\r\n";
    }
}
?>

然后您可以按如下方式创建文件下载链接：

/index.php?option=com_mycomp&view=something&format=csv

现在，您可以质疑＆＃39;内联＆＃39;参与Content-disposition。如果我几年前在编写这段代码时回忆得正确的话，那么“附件”就会出现问题。选项。我刚刚用Google搜索的这个链接似乎很熟悉它的驱动程序：https://dotanything.wordpress.com/2008/05/30/content-disposition-attachment-vs-inline/。我一直在使用＆＃39; inline＆＃39;从那时起，我仍然被提示从我测试的任何浏览器中适当地保存文件。我还没有尝试过使用附件＆＃39;最近的任何时候，所以它当然可以正常工作（现在有7年的链接！）

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