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使用 login_required 保护视图

限制路由访问并重定向匿名用户

使用 login_required 保护视图 是 CoddyKit 上的免费 Flask Academy 课时。 这是第 4 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Flask Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Flask Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Some Pages Need a Guard

A dashboard or settings page should never load for a stranger. You protect such routes so only a logged-in user can reach them.

The login_required Decorator

Flask-Login hands you a one-line gate: the login_required decorator. Stack it on any view and anonymous visitors get bounced away.

from flask_login import login_required

Apply It to a Route

Place login_required just below the route decorator. Order matters, so the auth check wraps the view that Flask actually calls.

@app.route("/dashboard")
@login_required
def dashboard():
    return "Welcome back"

What Happens to Strangers

If an anonymous user hits a guarded route, Flask-Login does not show the page. It redirects them to your login view instead.

Tell It Where Login Lives

For the redirect to work, set login_view on the manager. Give it the endpoint name of your login route so it knows the target.

login_manager.login_view = "login"

The next Parameter

Flask-Login appends a next query parameter to the login URL. It remembers where the user wanted to go before being redirected.

Send Them Back After Login

In your login view, read request.args.get for next and redirect there once they sign in. The user lands exactly where they started.

dest = request.args.get("next") or url_for("index")
return redirect(dest)

Customize the Message

You can set login_message to control the flash shown when access is denied. A friendly note beats a confusing silent redirect.

login_manager.login_message = "Please log in first."

Use current_user Inside

Inside a guarded view you can trust current_user is real and authenticated. No need to re-check, the decorator already did it.

@login_required
def profile():
    return current_user.email

Protecting Many Routes

For a whole admin area you can apply login_required per view, or attach it to a blueprint's before_request so every route is covered.

Beyond Just Logged In

login_required only checks that someone is authenticated. For role checks like admin-only, you add your own logic on top inside the view.

Quick Check

An anonymous visitor opens a login_required route. What does Flask-Login do?

Recap

You guarded routes with login_required, set login_view for redirects, and used next to return users home. Your protected pages are locked down. 🛡️

常见问题解答

「使用 login_required 保护视图」课时是免费的吗？

是的 — 「使用 login_required 保护视图」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Flask Academy 课程的其余内容，请升级到 CoddyKit PRO。 Flask Academy 课程共包含 4 节课。

「使用 login_required 保护视图」这节课中我会学到什么？

限制路由访问并重定向匿名用户 你通过在浏览器中直接运行的动手代码来练习 Flask Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Flask Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Flask Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 4 节课，共 4 节。

「使用 login_required 保护视图」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Flask Academy 课中编写并运行代码吗？

能。每节 Flask Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

  1. 哈希密码，绝不存储明文
  2. 用户加载器与 UserMixin
  3. login_user、logout_user 与会话
  4. 使用 login_required 保护视图
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