Magento无商品分类页及无效页码页面的301/404跳转需求

一、处理分类本身无商品的情况 #

通过创建插件拦截分类页面的加载逻辑，判断商品数量后执行重定向或返回404：

1. 创建插件文件 app/code/YourVendor/YourModule/Plugin/Catalog/Controller/Category/View.php：

<?php
namespace YourVendor\YourModule\Plugin\Catalog\Controller\Category;

use Magento\Catalog\Controller\Category\View as CategoryView;
use Magento\Framework\Controller\Result\RedirectFactory;
use Magento\Framework\Controller\Result\NotFoundFactory;

class View
{
    protected $redirectFactory;
    protected $notFoundFactory;

    public function __construct(
        RedirectFactory $redirectFactory,
        NotFoundFactory $notFoundFactory
    ) {
        $this->redirectFactory = $redirectFactory;
        $this->notFoundFactory = $notFoundFactory;
    }

    public function aroundExecute(CategoryView $subject, callable $proceed)
    {
        $category = $subject->_initCategory();
        if (!$category) {
            return $proceed();
        }

        // 统计分类下商品总数（含子分类商品，可根据需求调整逻辑）
        $productCount = $category->getProductCollection()->getSize();
        if ($productCount === 0) {
            // 301重定向到首页，可替换为其他目标URL
            $redirect = $this->redirectFactory->create();
            $redirect->setUrl('/');
            $redirect->setHttpResponseCode(301);
            return $redirect;

            // 若需返回404，替换为以下代码：
            // return $this->notFoundFactory->create();
        }

        return $proceed();
    }
}

2. 在 app/code/YourVendor/YourModule/etc/frontend/di.xml 中注册插件：

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Catalog\Controller\Category\View">
        <plugin name="yourmodule_category_empty_redirect" type="YourVendor\YourModule\Plugin\Catalog\Controller\Category\View" sortOrder="10"/>
    </type>
</config>

二、处理分类有效但页码无效的情况 #

拦截产品列表块的布局准备逻辑，判断页码有效性后执行对应操作：

1. 创建插件文件 app/code/YourVendor/YourModule/Plugin/Catalog/Block/Product/ListProduct.php：

<?php
namespace YourVendor\YourModule\Plugin\Catalog\Block\Product;

use Magento\Catalog\Block\Product\ListProduct;
use Magento\Framework\Controller\Result\RedirectFactory;
use Magento\Framework\Controller\Result\NotFoundFactory;
use Magento\Framework\App\RequestInterface;

class ListProduct
{
    protected $redirectFactory;
    protected $notFoundFactory;
    protected $request;

    public function __construct(
        RedirectFactory $redirectFactory,
        NotFoundFactory $notFoundFactory,
        RequestInterface $request
    ) {
        $this->redirectFactory = $redirectFactory;
        $this->notFoundFactory = $notFoundFactory;
        $this->request = $request;
    }

    public function afterPrepareLayout(ListProduct $subject, $result)
    {
        $toolbar = $subject->getToolbarBlock();
        $collection = $toolbar->getCollection();
        $currentPage = (int)$this->request->getParam('p');
        $lastPage = $toolbar->getLastPageNum();

        // 当页码大于总页数且分类存在商品时
        if ($currentPage > $lastPage && $lastPage > 0) {
            // 301重定向到分类首页
            $redirect = $this->redirectFactory->create();
            $redirect->setUrl($subject->getCategory()->getUrl());
            $redirect->setHttpResponseCode(301);
            $subject->getResponse()->setRedirect($redirect->getUrl(), 301);

            // 若需返回404，替换为以下代码：
            // $subject->getResponse()->setNotFound(true);
        }

        return $result;
    }
}

2. 在 app/code/YourVendor/YourModule/etc/frontend/di.xml 中注册插件：

<type name="Magento\Catalog\Block\Product\ListProduct">
    <plugin name="yourmodule_invalid_page_redirect" type="YourVendor\YourModule\Plugin\Catalog\Block\Product\ListProduct" sortOrder="10"/>
</type>

三、301 vs 404选择建议 #

• 若分类后续会添加商品，或无效页码为用户输入失误导致，用301重定向到分类首页/网站首页，保留流量与SEO权重。
• 若分类已废弃且不再使用，直接返回404，明确告知搜索引擎该页面已失效。

内容的提问来源于stack exchange，提问作者Amesh