Flask请求参数获取常用方式详解

@app.route('/detail/<int:aid>')
def detail(aid):
    return f"文章ID是: {aid}"

@app.route('/search')
def search():
    keyword = request.args.get('q')
    return f"搜索关键词: {keyword}"

/search?q=flask&page=2
       ↑         ↑
       |         request.args.get('page') → "2"
       request.args.get('q') → "flask"

@app.route('/login', methods=['POST'])
def login():
    username = request.form.get('username')
    password = request.form.get('password')
    return f"用户{username}登录中..."

<form action="/login" method="post">
  <input type="text" name="username">
  <input type="password" name="password">
  <button>提交</button>
</form>

@app.route('/detail/<int:aid>')
def detail():
    aid = request.args.get('aid')  # 这样获取不到!

@app.route('/detail/<int:aid>')
def detail(aid):  # 直接从参数获取
    return str(aid)

# 访问URL: /api?user=john
user = request.form.get('user')  # 返回None

# 提交了一个登录表单
username = request.args.get('username')  # 返回None

username = request.form.get('username')

print(request.args)  # 查看所有查询参数
print(request.form)  # 查看所有表单数据

from flask import Flask, request

app = Flask(__name__)

# 路由参数 + 查询参数
@app.route('/user/<int:user_id>')
def user_profile(user_id):
    action = request.args.get('action', 'view')  # 带默认值
    return f"用户{user_id}的个人资料，操作: {action}"

# 表单处理
@app.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'POST':
        username = request.form.get('username')
        email = request.form.get('email')
        return f"注册成功: {username} ({email})"
    return '''
        <form method="post">
            用户名: <input name="username"><br>
            邮箱: <input name="email"><br>
            <button>注册</button>
        </form>
    '''