最简单的hello world
#!/usr/bin/env python # encoding: utf-8 from flask import Flask app = Flask(__name__) @app.route(\'/\') def index(): return \'hello world\' if __name__ == \'__main__\': app.run(debug=True) #app.run(host=\'127.0.0.1\', port=8000)
之后,访问http://localhost:5000
支持post/get提交
@app.route(\'/\', methods=[\'GET\', \'POST\'])
多个url指向
@app.route(\'/\') @app.route(\'/index\')
不管post/get使用统一的接收
from flask import request args = request.args if request.method == \'GET\' else request.form a = args.get(\'a\', \'default\')
处理json请求
request的header中
\"Content-Type\": \"application/json\"
处理时:
data = request.get_json(silent=False)
获取post提交中的checkbox
{%for page in pages %}{%endfor%} page_ids = request.form.getlist(\"do_delete\") 使用url中的参数
@app.route(\'/query//\') def query(qid): pass 在request开始结束dosomething
一般可以处理数据库连接等等from flask import g app = ..... @app.before_request def before_request(): g.session = create_session() @app.teardown_request def teardown_request(exception): g.session.close()注册Jinja2模板中使用的过滤器
@app.template_filter(\'reverse\') def reverse_filter(s): return s[::-1]或者
def reverse_filter(s): return s[::-1] app.jinja_env.filters[\'reverse\'] = reverse_filter可以这么用
def a():... def b():... FIL = {\'a\': a, \'b\':b} app.jinja_env.filters.update(FIL)注册Jinja2模板中使用的全局变量
JINJA2_GLOBALS = {\'MEDIA_PREFIX\': \'/media/\'} app.jinja_env.globals.update(JINJA2_GLOBALS)定义应用使用的template和static目录
app = Flask(__name__, template_folder=settings.TEMPLATE_FOLDER, static_folder = settings.STATIC_PATH)使用Blueprint
from flask import Blueprint bp_test = Blueprint(\'test\', __name__) #bp_test = Blueprint(\'test\', __name__, url_prefix=\'/abc\') @bp_test.route(\'/\') -------- from xxx import bp_test app = Flask(__name__) app.register_blueprint(bp_test)实例:
bp_video = Blueprint(\'video\', __name__, url_prefix=\'/kw_news/video\') @bp_video.route(\'/search/category/\', methods=[\'POST\', \'GET\']) #注意这种情况下Blueprint中url_prefix不能以 \'/\' 结尾, 否则404使用session
包装cookie实现的,没有session idapp.secret_key = \'PS#yio`%_!((f_or(%)))s\'然后
from flask import session session[\'somekey\'] = 1 session.pop(\'logged_in\', None) session.clear() #过期时间,通过cookie实现的 from datetime import timedelta session.permanent = True app.permanent_session_lifetime = timedelta(minutes=5)反向路由
from flask import url_for, render_template @app.route(\"/\") def home(): login_uri = url_for(\"login\", next=url_for(\"home\")) return render_template(\"home.html\", **locals())上传文件