Python 无法在 Flask 模板中显示来自 STATIC_FOLDER 的图像
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Cannot show image from STATIC_FOLDER in Flask template
提问by Nervosa
I set folder for static files like this
我为这样的静态文件设置文件夹
app.config['STATIC_FOLDER'] = 'tmp'
In template i use img tag to show an image stored in /tmp:
在模板中，我使用 img 标签来显示存储在 /tmp 中的图像：
<img src='IKE2low.jpg' width="200" height="85">
In firebug i see 404 error instead of image. Please tell me what did i do wrong?
在萤火虫中，我看到 404 错误而不是图像。请告诉我我做错了什么？
Thanks in advance.
提前致谢。
采纳答案by Miguel
I'm not sure what is this STATIC_FOLDERconfiguration item you are using. Where did you find it?
我不确定STATIC_FOLDER您使用的这个配置项是什么。你在哪里找到它？
There are actually two arguments to the Flaskclass constructor that govern the configuration of static files:
Flask类构造函数实际上有两个参数来管理静态文件的配置：
static_folder: defaults to "static". This is the prefix that you have to use in URLs to access the static files.
static_url_path: this is the disk location of the static folder. By default this value is the same as the static_folder setting.
static_folder：默认为“静态”。这是您必须在 URL 中使用以访问静态文件的前缀。
static_url_path：这是静态文件夹的磁盘位置。默认情况下，此值与 static_folder 设置相同。
For example, if you use this configuration:
例如，如果您使用此配置：
from flask import Flask
app = Flask(__name__, static_url_path = "/tmp", static_folder = "tmp")
Then you can access your images as follows:
然后您可以按如下方式访问您的图像：
<img src='/tmp/IKE2low.jpg' width="200" height="85">
You can also remove the need to have a prefix in the URLs as follows:
您还可以取消在 URL 中使用前缀的需要，如下所示：
from flask import Flask
app = Flask(__name__, static_url_path = "", static_folder = "tmp")
And then you can access your images as:
然后你可以访问你的图像：
<img src='/IKE2low.jpg' width="200" height="85">
Note that you still need to have a root /.
请注意，您仍然需要有一个 root /。
But the best way to do this is to not reference image paths explicitly and instead use url_forto generate the correct URLs. If you are using Jinja2 templates that would be:
但最好的方法是不显式引用图像路径，而是使用url_for生成正确的 URL。如果您使用的是 Jinja2 模板，则：
<img src="{{ url_for('static', filename = 'IKE2low.jpg') }}" width="200" height="85">
This last expression would work regardless of where and how the static files are configured.
无论静态文件的配置位置和方式如何，最后一个表达式都可以使用。
