from flask import Flask, render_template, request

app = Flask(__name__)

@app.route('/form', methods=['GET', 'POST'])
def form_handler():
    if request.method == 'POST':
        # 处理表单提交
        data = request.form
        # 执行相关处理逻辑
        return render_template('success.html', data=data)
    else:
        return render_template('form.html')

if __name__ == '__main__':
    app.run()

<!-- form.html -->
<form method="post" action="/form">
  <input type="text" name="username" placeholder="Username">
  <input type="password" name="password" placeholder="Password">
  <button type="submit">Submit</button>
</form>

<!-- success.html -->
<h1>Success!</h1>
<p>Welcome, {{ data.username }}! Your password is {{ data.password }}</p>