Flask用户登录之后查看学生信息的小案例

　　需求:

　　1. 用户名: anny密码: 123

　　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': 'anny', 'password': "123"}
 7 
 8 STUDENT_DICT = {
 9     1: {'name': '张三', 'age': 38, 'gender': '中'},
10     2: {'name': '李四', 'age': 73, 'gender': '男'},
11     3: {'name': '王五', '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)

 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:

 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>

 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>

 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>

 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>

　　补充：

　　在用户登录后，才能查看学员信息，这里简单使用flask中session验证

　　后端代码增加一个装饰器函数，把需要验证的函数都加上装饰器，这样就实现了登录之后才能查看学员信息的功能

　　后端部分代码：

from flask import Flask, render_template, request, session

# session的key，一个随机字符串
app.secret_key = "sdsfdsgdfgdfgfh"


# 登录验证装饰器
def wrapper(func):
    @wraps(func)
    def inner(*args, **kwargs):
        if session.get("user"):
            ret = func(*args, **kwargs)
            return ret
        else:
            return redirect("/login")

    return inner

@app.route("/login", methods=["GET", "POST"])
def login():
     if request.method == "POST":
        if request.form["username"] == USER["username"] and request.form["password"] == USER["password"]:
             session["user"] = user
             return redirect("/student_list")
         return render_template("login.html", msg="用户名密码错误")

    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


@app.route("/student_list")
@wrapper
def student():
     return render_template("student_list.html", student=STUDENT_DICT)
 
 
@app.route("/info")
@wrapper
def student_info():
     stu_id = int(request.args["id"])
     stu_info = STUDENT_DICT[stu_id]
     return render_template("student.html", student=stu_info, stu_id=stu_id)

posted @ 2019-07-11 15:35 Amorphous 阅读(521) 评论(0) 编辑收藏举报

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Flask用户登录之后查看学生信息的小案例

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