需求:
1. 用户名: oldboy 密码: oldboy123
2. 用户登录成功之后跳转到列表页面
3. 失败有消息提示,重新登录
4.点击学生名称之后,可以看到学生的详细信息
后端:
1 from flask import Flask
2 from flask import request
3 from flask import render_template
4 from flask import redirect
5
6 USER = {'username': 'oldboy', 'password': "oldboy123"}
7
8 STUDENT_DICT = {
9 1: {'name': 'Old', 'age': 38, 'gender': '中'},
10 2: {'name': 'Boy', 'age': 73, 'gender': '男'},
11 3: {'name': 'EDU', 'age': 84, 'gender': '女'},
12 }
13
14 app = Flask(__name__)
15
16
17 @app.route("/login", methods=["GET", "POST"])
18 def login():
19 if request.method == "POST":
20 if request.form["username"] == USER["username"] and request.form["password"] == USER["password"]:
21 return redirect("/student_list")
22 return render_template("login.html", msg="用户名密码错误")
23
24 return render_template("login.html", msg=None) # 如果前端Jinja2模板中使用了msg,这里就算是传递None也要出现msg
25
26
27 @app.route("/student_list")
28 def student():
29 return render_template("student_list.html", student=STUDENT_DICT)
30
31
32 @app.route("/info")
33 def student_info():
34 stu_id = int(request.args["id"])
35 stu_info = STUDENT_DICT[stu_id]
36 return render_template("student.html", student=stu_info, stu_id=stu_id)
37
38
39 app.run("0.0.0.0", 5000, debug=True)
前端:
login.html:
1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <title>Welcome to Old Boy EDU</title>
6 </head>
7 <body>
8 <form method="post">
9 用户名:<input type="text" name="username">
10 密码:<input type="text" name="password">
11 <input type="submit" value="登录">
12 {{ msg }}
13 </form>
14 </body>
15 </html>
student_list.html:
1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <title>Old Boy EDU</title>
6 </head>
7 <body>
8 Welcome to Old Boy EDU
9 <table border="2xp">
10 <thead>
11 <tr>
12 <td>id</td>
13 <td>name</td>
14 <td>option</td>
15 </tr>
16 </thead>
17 <tbody>
18 {% for foo in student %}
19 <tr>
20 <td>{{ foo }}</td>
21 <td>{{ student[foo].name }}</td>
22 <td><a href="/info?id={{ foo }}">详细</a></td>
23 </tr>
24 {% endfor %}
25 </tbody>
26 </table>
27 </body>
28 </html>
student.html
1 <!DOCTYPE html>
2 <html lang="en">
3 <head>
4 <meta charset="UTF-8">
5 <title>Old Boy EDU</title>
6 </head>
7 <body>
8 Welcome to Old Boy EDU
9 <table border="1px">
10 <thead>
11 <tr>
12 <td>id</td>
13 <td>name</td>
14 <td>age</td>
15 <td>gender</td>
16 </tr>
17 </thead>
18 <tbody>
19 <tr>
20 <td>{{ stu_id }}</td>
21 <td>{{ student.name }}</td>
22 <td>{{ student["age"] }}</td>
23 <td>{{ student.get("gender") }}</td>
24 </tr>
25 </tbody>
26 </table>
27 <div><a href="/student_list">返回</a></div>
28 </body>
29 </html>
思考题:
1.如果我直接访问 /student_list 和 /student 是不是也可以?
2.怎么才能在所有的url地址中校验是否登录?
第五篇,完结