Flask Web开发入门（十四）之使用蓝图（Blueprints）

旧城等待， 2022-05-31 23:37 148阅读 0赞

> Flask uses a concept of blueprints for making application components and supporting common patterns within an application or across applications. Blueprints can greatly simplify how large applications work and provide a central means for Flask extensions to register operations on applications. A Blueprint object works similarly to a Flask application object, but it is not actually an application. Rather it is a blueprint of how to construct or extend an application.

蓝图可以看作是构建模块或组件的模板，一个蓝图定义了可用于单个应用的视图，模板，静态文件等等的集合，在一个大型的应用中，你可以多次注册，每次构建都会生成一个新的副本。

![这里写图片描述][SouthEast]

下面我们示例说明：

*  定义蓝图

from flask import Blueprint, render_template, jsonify
    import monitor_logger
    import time
    
    # https://spacewander.github.io/explore-flask-zh/7-blueprints.html
    # http://flask.pocoo.org/docs/0.12/blueprints/
    admin = Blueprint('admin', __name__, template_folder='admin')
    
    logger = monitor_logger.get_logger(__name__)
    
    
    @admin.route('/admin/<page>')
    def admin_url(page):
        logger.debug('admin page is %s' % page)
        return render_template('/admin/%s.html' % page)
    
    
    @admin.route('/admin/<int:num>')
    def get(num):
        logger.debug('get method is %s' % num)
        return jsonify({
       'value': num + 1, 'timestamp': time.time()})

*  注册蓝图，注意我们注册两次，区别是我们通过**url\_prefix**参数实现同一应用中同一蓝图不同位置的挂载

app.register_blueprint(admin)
    app.register_blueprint(admin, url_prefix='/v1')

*  结果验证：同一页面，我们可以有两个不同的访问地址

**访问：**[http://127.0.0.1:9000/v1/admin/index][http_127.0.0.1_9000_v1_admin_index]

![这里写图片描述][SouthEast 1]

**访问：**[http://127.0.0.1:9000/admin/index][http_127.0.0.1_9000_admin_index]

![这里写图片描述][SouthEast 2]

[https://stackoverflow.com/questions/24420857/what-are-flask-blueprints-exactly][https_stackoverflow.com_questions_24420857_what-are-flask-blueprints-exactly]

**源码参考**：[https://github.com/ypmc/flask-sqlalchemy-web][https_github.com_ypmc_flask-sqlalchemy-web]

[SouthEast]: /images/20220601/8f6d255fb9b64cf8b19b604c91ec2637.png
[http_127.0.0.1_9000_v1_admin_index]: http://127.0.0.1:9000/v1/admin/index
[SouthEast 1]: /images/20220601/54896b47dff145adbf8934c4ad49f27d.png
[http_127.0.0.1_9000_admin_index]: http://127.0.0.1:9000/admin/index
[SouthEast 2]: /images/20220601/a86b899062e344a69bbf0b8aad04431c.png
[https_stackoverflow.com_questions_24420857_what-are-flask-blueprints-exactly]: https://stackoverflow.com/questions/24420857/what-are-flask-blueprints-exactly
[https_github.com_ypmc_flask-sqlalchemy-web]: https://github.com/ypmc/flask-sqlalchemy-web