docs: 2026-04-14作业

2026-04-14/2026-04-14_hw_1.py

@@ -0,0 +1,32 @@
+from flask import Flask, after_this_request
+
+app = Flask(__name__)
+
+@app.before_first_request
+def before_first_request():
+    print('这是请求钩子 before_first_request 注册的函数')
+
+@app.before_request
+def before_request():
+    print('这是请求钩子 before_request 注册的函数')
+
+@app.route('/index')
+def index():
+    print('hello flask')
+    @after_this_request
+    def after_this_request_func(response):
+        print('这是请求钩子 after_this_request_func 注册的函数')
+        return response
+    return 'hello flask'
+
+@app.after_request
+def after_request(response):
+    print('这是请求钩子 after_request 注册的函数')
+    return response
+
+@app.teardown_request
+def teardown_request(error):
+    print('这是请求钩子 teardown_request 注册的函数')
+
+if __name__ == '__main__':
+    app.run()

2026-04-14/2026-04-14_hw_2.py

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+from flask import Flask, url_for, request, redirect, session
+
+app = Flask(__name__)
+app.secret_key = 'Your_secret_key$^52@!'
+
+@app.route('/index')
+def index():
+    if 'username' in session:
+        return f'你好，{session.get("username")}'
+    return redirect(url_for("login"))
+
+@app.route('/login', methods=['GET', 'POST'])
+def login():
+    if request.method == 'POST':
+        session['username'] = request.form['username']
+        return redirect(url_for('index'))
+    # 当发送GET请求时，页面显示输入框和"登录"按钮
+    return '''
+    <form method="post">
+        <p><input type=text name=username>
+        <p><input type=submit value=登录>
+    </form>
+    '''
+
+if __name__ == '__main__':
+    app.run()