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从正文读取 POST 数据

在视图中访问表单和 JSON 负载

从正文读取 POST 数据 是 CoddyKit 上的免费 Flask Academy 课时。这是第 3 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。

POST Carries a Body

Unlike a plain GET, a POST request ships data in its body. Your view reads that body to learn what the client sent.

Two Common Body Types

Most bodies are either an HTML form submission or a JSON payload from an API client. Flask offers a separate accessor for each.

Form Fields via request.form

When a browser submits a form, the values live in request.form, a dict-like object keyed by each field name.

name = request.form["name"]

Use get to Avoid Errors

Reading a missing key with brackets raises an error. Prefer request.form.get, which returns None when the field is absent.

email = request.form.get("email")

Supply a Default

Pass a second argument to get for a fallback value. It keeps your view working even when a field was left out.

page = request.form.get("page", "1")

JSON via get_json

API clients send JSON, not form fields. Call request.get_json to parse the body into a Python dictionary.

data = request.get_json()
name = data["name"]

Content-Type Decides

Flask reads the request's Content-Type header. Form fields need urlencoded data, while get_json expects application/json.

Guard Against Missing JSON

If the body is not valid JSON, get_json can return None. Pass silent=True to get None instead of an error you must catch.

data = request.get_json(silent=True)

Do Not Mix Them Up

Calling request.form on a JSON body gives you nothing. Match the accessor to how the client actually sent the data.

Files Live Elsewhere

Uploaded files do not appear in request.form. They arrive in request.files, keyed by the file input's name.

Always Validate Body Data

Never trust the body blindly. Check that required keys exist and have sane values before you save or act on them.

Quick Check

Choose the right accessor for an API client.

Recap

Read form submissions with request.form.get and JSON payloads with request.get_json. Match the accessor to the Content-Type and validate. Solid! 👍

常见问题解答

「从正文读取 POST 数据」课时是免费的吗？

是的 — 「从正文读取 POST 数据」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。

「从正文读取 POST 数据」这节课中我会学到什么？

在视图中访问表单和 JSON 负载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 3 节课，共 4 节。

「从正文读取 POST 数据」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。

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