在线实时投票系统

在线实时投票系统

方案一：用户手动刷新

方案二：用轮询实现票数实时显示--flask

在前端页面写一个函数，每个两秒刷新页面

 app.py

from flask import Flask,request,render_template,redirect,session

app = Flask(__name__)
app.secret_key = 'asdfasdf'
@app.before_request
def check_login():
if request.path == '/login':
return None
user = session.get('user_info')
if not user:
return redirect('/login')

@app.route('/login',methods=['GET',"POST"])
def login():
if request.method == "GET":
return render_template('login.html')
else:
user = request.form.get('user')
pwd = request.form.get('pwd')
session['user_info'] = user
return redirect('/index')


GENTILEMAN = {
'1':{'name':'向龙','count':0},
'2':{'name':'霄汉','count':0},
}

@app.route('/index')
def index():
return render_template('index.html',gg=GENTILEMAN)


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

app.py

 login.html

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Title</title>
</head>
<body>
<form method="post">
<input type="text" name="user">
<input type="text" name="pwd">
<input type="submit" value="提交">
</form>

</body>
</html>

login.html

 index.html

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Title</title>
</head>
<body>
<h1>请选出最帅的男人</h1>
<ul>
{% for k,v in gg.items() %}
<li>ID:{{ k }}, 姓名：{{ v.name }} ，票数：{{ v.count }}</li>
{% endfor %}
</ul>

<script>
setInterval(function () {
location.reload();
},2000)
</script>
</body>
</html>

index.html

 方案二：用长轮询实现票数实时显示

 login.html

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Title</title>
</head>
<body>
<form method="post">
<input type="text" name="user">
<input type="text" name="pwd">
<input type="submit" value="提交">
</form>

</body>
</html>

login.html

 index.html

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Title</title>
</head>
<body>
<h1>请选出最帅的男人</h1>
<ul>
{% for k,v in gg.items() %}
<li style="cursor: pointer" id="user_{{ k }}" ondblclick="vote({{ k }});">ID:{{ k }}, 姓名：{{ v.name }} ，票数：<span>{{ v.count }}</span></li>
{% endfor %}
</ul>

<script src="/static/jquery-3.3.1.min.js"></script>
<script>
$(function () {
get_new_count();
});

function get_new_count() {
$.ajax({
url: '/get_new_count',
type:'GET',
dataType:'JSON',
success:function (arg) {
if (arg.status){
// 更新票数
var gid = "#user_" + arg.data.gid;
$(gid).find('span').text(arg.data.count);
}else{
// 10s内没有人投票
}
get_new_count();

}
})
}

function vote(gid) {
$.ajax({
url: '/vote',
type:'POST',
data:{gid:gid},
dataType:"JSON",
success:function (arg) {

}
})
}
</script>
</body>
</html>

index.html

 app.py

from flask import Flask,request,render_template,redirect,session,jsonify
import uuid
import queue

app = Flask(__name__)
app.secret_key = 'asdfasdf'

USER_QUEUE = {

}

@app.before_request
def check_login():
if request.path == '/login':
return None
user = session.get('user_info')
if not user:
return redirect('/login')

@app.route('/login',methods=['GET',"POST"])
def login():
if request.method == "GET":
return render_template('login.html')
else:
user = request.form.get('user')
pwd = request.form.get('pwd')
uid = str(uuid.uuid4())
USER_QUEUE[uid] = queue.Queue()
session['user_info'] = {'uid':uid,'name':user}
return redirect('/index')


GENTILEMAN = {
'1':{'name':'向龙','count':0},
'2':{'name':'霄汉','count':0},
}

@app.route('/index')
def index():
return render_template('index.html',gg=GENTILEMAN)

@app.route('/get_new_count')
def get_new_count():
"""
获取用户session中的uid
根据uid获取当前登录用的队列
:return:
"""
ret = {'status':True,'data':None }
uid = session['user_info']['uid']
q = USER_QUEUE[uid]
try:
data = q.get(timeout=10)
ret['data'] = data
except queue.Empty as e:
ret['status'] = False

return jsonify(ret)

@app.route('/vote',methods=['POST'])
def vote():
"""
接收用户请求，对帅哥进行投票
:return:
"""
gid = request.form.get('gid')
old = GENTILEMAN[gid]['count']
new = old + 1
GENTILEMAN[gid]['count'] = new

data = {'gid':gid,'count':new}
for q in USER_QUEUE.values():
q.put(data)

return 'OK'

 


if __name__ == '__main__':
app.run(host='0.0.0.0',threaded=True)

app.py

使用redis的列表实现：

 app.py

from flask import Flask,request,render_template,redirect,session,jsonify
import uuid
import queue
import json

app = Flask(__name__)
app.secret_key = 'asdfasdf'
import redis
conn = redis.Redis(host='127.0.0.1', port=6379)

GENTILEMAN = {
'1':{'name':'向龙','count':0},
'2':{'name':'霄汉','count':0},
}

@app.before_request
def check_login():
if request.path == '/login':
return None
user = session.get('user_info')
if not user:
return redirect('/login')

@app.route('/login',methods=['GET',"POST"])
def login():
if request.method == "GET":
return render_template('login.html')
else:
user = request.form.get('user')
pwd = request.form.get('pwd')
uid = str(uuid.uuid4())
conn.lpush('xxxxxxxxxxxxxxxxx',uid)
session['user_info'] = {'uid':uid,'name':user}
return redirect('/index')

@app.route('/index')
def index():
return render_template('index.html',gg=GENTILEMAN)

@app.route('/get_new_count')
def get_new_count():
"""
获取用户session中的uid
根据uid获取当前登录用的队列
:return:
"""
ret = {'status':True,'data':None }
uid = session['user_info']['uid']

data = conn.brpop(uid,timeout=20)
if not data:
ret['status'] = False
else:
# print(data[1]) # {'gid':gid,'count':new}
data_str = str(data[1], encoding='utf-8')
data_dict = json.loads(data_str)
ret['data'] = data_dict
return jsonify(ret)

@app.route('/vote',methods=['POST'])
def vote():
"""
接收用户请求，对帅哥进行投票
:return:
"""
gid = request.form.get('gid')
old = GENTILEMAN[gid]['count']
new = old + 1
GENTILEMAN[gid]['count'] = new

data = json.dumps({'gid':gid,'count':new})
uid_list = conn.lrange('xxxxxxxxxxxxxxxxx', 0, conn.llen('xxxxxxxxxxxxxxxxx'))
for uid in uid_list:
conn.lpush(uid, data)
return 'OK'


if __name__ == '__main__':
app.run(host='0.0.0.0',threaded=True)

app.py

 login.html

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Title</title>
</head>
<body>
<form method="post">
<input type="text" name="user">
<input type="text" name="pwd">
<input type="submit" value="提交">
</form>

</body>
</html>

login.html

 index.html

<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Title</title>
</head>
<body>
<h1>请选出最帅的男人</h1>
<ul>
{% for k,v in gg.items() %}
<li style="cursor: pointer" id="user_{{ k }}" ondblclick="vote({{ k }});">ID:{{ k }}, 姓名：{{ v.name }} ，票数：<span>{{ v.count }}</span></li>
{% endfor %}
</ul>

<script src="/static/jquery-3.3.1.min.js"></script>
<script>
$(function () {
get_new_count();
});

function get_new_count() {
$.ajax({
url: '/get_new_count',
type:'GET',
dataType:'JSON',
success:function (arg) {
if (arg.status){
// 更新票数
var gid = "#user_" + arg.data.gid;
$(gid).find('span').text(arg.data.count);
}else{
// 10s内没有人投票
}
get_new_count();

}
})
}

function vote(gid) {
$.ajax({
url: '/vote',
type:'POST',
data:{gid:gid},
dataType:"JSON",
success:function (arg) {

}
})
}
</script>
</body>
</html>

index.html

 

posted on 2019-05-14 11:07  斜阳红红  阅读(559)  评论(0)  编辑  收藏  举报
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