diff -u b/core/modules/book/book.services.yml b/core/modules/book/book.services.yml
--- b/core/modules/book/book.services.yml
+++ b/core/modules/book/book.services.yml
@@ -6,3 +6,5 @@
-    class: Drupal\book\Access\BookExport
+    class: Drupal\book\Access\BookAccessCheck
     tags:
       - { name: access_check }
+  book.export:
+    class: Drupal\book\BookExport
reverted:
--- b/core/modules/book/lib/Drupal/book/Access/BookExport.php
+++ /dev/null
@@ -1,34 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\book\Access\BookAccessCheck.
- */
-
-namespace Drupal\book\Access;
-
-use Drupal\Component\Plugin\PluginManagerInterface;
-use Drupal\Core\Access\AccessCheckInterface;
-use Symfony\Component\Routing\Route;
-use Symfony\Component\HttpFoundation\Request;
-
-/**
- * Access check for book export.
- */
-class BookExport implements AccessCheckInterface {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function applies(Route $route) {
-    return array_key_exists('_book_export_access', $route->getRequirements());
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function access(Route $route, Request $request) {
-    return user_access('access printer-friendly version') && node_access('view', $request->attributes->get('node'));
-  }
-
-}
diff -u b/core/modules/book/lib/Drupal/book/Controller/BookController.php b/core/modules/book/lib/Drupal/book/Controller/BookController.php
--- b/core/modules/book/lib/Drupal/book/Controller/BookController.php
+++ b/core/modules/book/lib/Drupal/book/Controller/BookController.php
@@ -9,13 +9,11 @@
 use Drupal\Core\Controller\ControllerInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\Response;
-use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
 use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Drupal\Component\Utility\Unicode;
 
 use Drupal\node\NodeInterface;
 use Drupal\book\BookManager;
-use Drupal\node\Plugin\Core\Entity\Node;
 
 /**
  * Controller routines for book routes.
@@ -118,92 +116,15 @@
     $type = Unicode::strtolower($type);
 
-    // @todo Conver the custom export functionality to serializer.
+    // @todo Convert the custom export functionality to serializer.
+    $book_export_service = \Drupal::service('book.export');
     $method = 'bookExport' . $type;
-    if (method_exists($this, $method)) {
-      return new Response($this->{$method}($node));
-    }
-    else {
+    if (!method_exists($book_export_service, $method)) {
       drupal_set_message(t('Unknown export format.'));
       throw new NotFoundHttpException();
     }
-  }
 
-  /**
-   * Generates HTML for export when invoked by book_export().
-   *
-   * The given node is embedded to its absolute depth in a top level section. For
-   * example, a child node with depth 2 in the hierarchy is contained in
-   * (otherwise empty) <div> elements corresponding to depth 0 and depth 1.
-   * This is intended to support WYSIWYG output - e.g., level 3 sections always
-   * look like level 3 sections, no matter their depth relative to the node
-   * selected to be exported as printer-friendly HTML.
-   *
-   * @param \Drupal\node\NodeInterface $node
-   *   The node to export.
-   *
-   * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
-   *   Thrown when the node was not attached to a book.
-   * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
-   *   Thrown when the user does not have access to export a book.
-   *
-   * @internal param $ \Drupal\node\Plugin\Core\Entity\Node
-   *   The node to export.
-   *
-   * @return string A string containing HTML representing the node and its children in
-   */
-  public function bookExportHtml(NodeInterface $node) {
-    if (user_access('access printer-friendly version')) {
-      if (isset($node->book)) {
-        $tree = book_menu_subtree_data($node->book);
-        $contents = $this->exportTraverse($tree, 'book_node_export');
-        return theme('book_export_html', array('title' => $node->label(), 'contents' => $contents, 'depth' => $node->book['depth']));
-      }
-      else {
-        throw new NotFoundHttpException();
-      }
-    }
-    else {
-      throw new AccessDeniedHttpException();
-    }
+    return new Response($book_export_service->{$method}($node));
   }
 
-  /**
-   * Traverses the book tree to build printable or exportable output.
-   *
-   * During the traversal, the $visit_func() callback is applied to each node and
-   * is called recursively for each child of the node (in weight, title order).
-   *
-   * @param array $tree
-   *   A subtree of the book menu hierarchy, rooted at the current page.
-   * @param string $visit_func
-   *   A function callback to be called upon visiting a node in the tree.
-   *
-   * @return string
-   *   The output generated in visiting each node.
-   */
-  protected function exportTraverse($tree, $visit_func) {
-    $output = '';
-
-    foreach ($tree as $data) {
-      // Note- access checking is already performed when building the tree.
-      if ($node = node_load($data['link']['nid'])) {
-        $children = '';
-
-        if ($data['below']) {
-          $children = $this->exportTraverse($data['below'], $visit_func);
-        }
-
-        if (!empty($visit_func)) {
-          $output .= call_user_func($visit_func, $node, $children);
-        }
-        else {
-          // Use the default function.
-          $output .= book_node_export($node, $children);
-        }
-      }
-    }
-
-    return $output;
-  }
 
 }
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/book/lib/Drupal/book/Access/BookAccessCheck.php
@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\book\Access\BookAccessCheck.
+ */
+
+namespace Drupal\book\Access;
+
+use Drupal\Component\Plugin\PluginManagerInterface;
+use Drupal\Core\Access\AccessCheckInterface;
+use Symfony\Component\Routing\Route;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Access check for book export.
+ */
+class BookAccessCheck implements AccessCheckInterface {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function applies(Route $route) {
+    return array_key_exists('_book_export_access', $route->getRequirements());
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function access(Route $route, Request $request) {
+    return user_access('access printer-friendly version') && node_access('view', $request->attributes->get('node'));
+  }
+
+}
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/book/lib/Drupal/book/BookExport.php
@@ -0,0 +1,95 @@
+<?php
+/**
+ * @file
+ * Contains \Drupal\book\BookExport.
+ *
+ * Class used for exporting book to different formats. If you would like
+ * to add another format, swap this class in container.
+ */
+
+namespace Drupal\book;
+
+use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
+
+use Drupal\node\NodeInterface;
+
+class BookExport {
+
+  /**
+   * Generates HTML for export when invoked by book_export().
+   *
+   * The given node is embedded to its absolute depth in a top level section. For
+   * example, a child node with depth 2 in the hierarchy is contained in
+   * (otherwise empty) <div> elements corresponding to depth 0 and depth 1.
+   * This is intended to support WYSIWYG output - e.g., level 3 sections always
+   * look like level 3 sections, no matter their depth relative to the node
+   * selected to be exported as printer-friendly HTML.
+   *
+   * @param \Drupal\node\NodeInterface $node
+   *   The node to export.
+   *
+   * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+   *   Thrown when the node was not attached to a book.
+   * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
+   *   Thrown when the user does not have access to export a book.
+   *
+   * @internal param $ \Drupal\node\Plugin\Core\Entity\Node
+   *   The node to export.
+   *
+   * @return string A string containing HTML representing the node and its children in
+   */
+  public function bookExportHtml(NodeInterface $node) {
+    if (!user_access('access printer-friendly version')) {
+      throw new AccessDeniedHttpException();
+    }
+
+    if (!isset($node->book)) {
+      throw new NotFoundHttpException();
+    }
+
+    $tree = book_menu_subtree_data($node->book);
+    $contents = $this->exportTraverse($tree, 'book_node_export');
+    return theme('book_export_html', array('title' => $node->label(), 'contents' => $contents, 'depth' => $node->book['depth']));
+  }
+
+  /**
+   * Traverses the book tree to build printable or exportable output.
+   *
+   * During the traversal, the $visit_func() callback is applied to each node and
+   * is called recursively for each child of the node (in weight, title order).
+   *
+   * @param array $tree
+   *   A subtree of the book menu hierarchy, rooted at the current page.
+   * @param string $visit_func
+   *   A function callback to be called upon visiting a node in the tree.
+   *
+   * @return string
+   *   The output generated in visiting each node.
+   */
+  protected function exportTraverse($tree, $visit_func) {
+    $output = '';
+
+    foreach ($tree as $data) {
+      // Note- access checking is already performed when building the tree.
+      if ($node = node_load($data['link']['nid'])) {
+        $children = '';
+
+        if ($data['below']) {
+          $children = $this->exportTraverse($data['below'], $visit_func);
+        }
+
+        if (!empty($visit_func)) {
+          $output .= call_user_func($visit_func, $node, $children);
+        }
+        else {
+          // Use the default function.
+          $output .= book_node_export($node, $children);
+        }
+      }
+    }
+
+    return $output;
+  }
+
+}