erste Lauffähige Fassung

com_eis/src/Controller/DisplayController.php

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+<?php
+namespace EIS\Component\EIS\Administrator\Controller;
+
+\defined('_JEXEC') or die;
+
+use Joomla\CMS\MVC\Controller\BaseController;
+use Joomla\CMS\Factory;
+
+class DisplayController extends BaseController
+{
+    protected $default_view = 'main';
+
+    /**
+     * Endpoint to generate JSON of PDF directory tree
+     */
+    public function scan(): void
+    {
+        $input = Factory::getApplication()->input;
+        // Default to PDF folder if no path provided
+        $defaultPath = JPATH_ROOT . DIRECTORY_SEPARATOR . 'pdf';
+        $path = $input->getString('path', $defaultPath);
+        $data  = $this->scanFolder($path);
+
+        // Encode JSON
+        $json = json_encode($data, JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);
+
+        // Determine output file path
+        $outputFile = JPATH_ROOT . DIRECTORY_SEPARATOR . 'media' . DIRECTORY_SEPARATOR . 'com_eis' . DIRECTORY_SEPARATOR . 'documents.json';
+        // Ensure directory exists
+        $dir = dirname($outputFile);
+        if (!is_dir($dir)) {
+            mkdir($dir, 0755, true);
+        }
+        // Write JSON to file
+        file_put_contents($outputFile, $json);
+
+        // Provide feedback and redirect
+        Factory::getApplication()
+            ->enqueueMessage('JSON file saved to ' . $outputFile, 'message');
+        // Ausgabe auch im Bachkend
+            Factory::getApplication()->setUserState('com_eis.pdfdata', $data);
+        $this->setRedirect('index.php?option=com_eis&view=main');
+    }
+
+    /**
+     * Recursively scans a directory and returns an array structure
+     * with names and absolute paths for PDF files.
+     *
+     * @param string $dir Absolute filesystem path
+     * @return array Structure: [ ['name'=>'FolderName','children'=>[...] ], ['name'=>'file.pdf','path'=>'/abs/path/file.pdf'] ]
+     */
+    private function scanFolder(string $dir): array
+    {
+        $result = [];
+        if (!is_dir($dir)) {
+            return $result;
+        }
+
+        foreach (scandir($dir) as $file) {
+            if ($file === '.' || $file === '..') {
+                continue;
+            }
+            $fullPath = $dir . DIRECTORY_SEPARATOR . $file;
+
+            if (is_dir($fullPath)) {
+                // Directory: include name and children
+                $result[] = [
+                    'name'     => $file,
+                    'children' => $this->scanFolder($fullPath)
+                ];
+            } elseif (is_file($fullPath) && strtolower(pathinfo($file, PATHINFO_EXTENSION)) === 'pdf') {
+                // File: include name and absolute path
+                $result[] = [
+                    'name' => $file,
+                    'path' => $fullPath
+                ];
+            }
+        }
+
+        return $result;
+    }
+}

com_eis/src/Extension/EISComponent.php

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+<?php
+namespace EIS\Component\EIS\Administrator\Extension;
+
+\defined('_JEXEC') or die;
+
+use Joomla\CMS\Extension\MVCComponent;
+
+final class EISComponent extends MVCComponent
+{
+}

com_eis/src/View/Main/HtmlView.php

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+<?php
+namespace EIS\Component\EIS\Administrator\View\Main;
+
+\defined('_JEXEC') or die;
+use Joomla\CMS\Factory;
+use Joomla\CMS\MVC\View\HtmlView as BaseHtmlView;
+
+class HtmlView extends BaseHtmlView
+{
+    public function display($tpl = null): void
+    {
+        echo "<h2>Willkommen bei EIS</h2>";
+        $this->data = Factory::getApplication()->getUserState('com_eis.pdfdata');
+        parent::display($tpl);
+    }
+}