一、日志输出到文件
使用模块：logging
可以生成自定义等级日志，可以输出日志到指定路径
日志等级：debug(调试日志) < info(重要信息日志) < warning(警告日志) < error(异常日志) < critical(严重错误)
1、封装日志输出方法()
import logging as lg
import os
class logging_():
def __init__(path,delete=True)
self.path = path
name = 'log.log'
self.log_ = os.path.join(self.path,name)
if delete == True：
open(f"{path}/{name}","w").close
self.logger = lg.getLogger('logger')
self.logger.setLevel(lg.DEBUG)
self.fmt = lg.Formatter("[%(asctime)s] - %(levelname)s: %(message)s","%Y-%m-%d %H:%M:%S")
self.fh = lg.FileHandler(self.log_,encoding='utf-8')
self.fh.setFormatter(self.fmt)
self.logger.addHandler(self.fh)
self.sh=lg.StreamHandler()
self.sh.setFormatter(self.fmt)
self.logger.addHandler(self.sh)
self.fh.close()
if __name__ == '__main__':
_path = os.paht.dirname(__file__)
lg = logging_(_path).logger
lg.info('1111')
lg.debug('2222')
lg.error('33333')
lg.warning('44444')
运行后输出内容，当前文件目录下多了一个log.log文件：
二、生成日志和读取日志
1、新建一个py文件(generation_log)，文件名自定，
2、直接上代码
from logging.demo_01 import logging_
import os，time
_path = os.path.dirname(__file__)
lg = logging_(_path)
def generation_log():
for i in range(20):
lg.info(i)
time.sleep(1)
def red_logs():
log_path = f'{_path}/log.log'
with open(log_path,'rb') as f:
log_size = path.getsize(log_path)
offset = -100
if log_size == 0:
return ''
while True:
if (abs(offset) >= log_size):
f.seek(-log_size, 2)
data = f.readlines()
return data
data = f.readlines()
if (len(data) > 1):
return data
else:
offset *= 2
三、Flask创建一个web服务
flask是干啥的当下不做解释，有兴趣可以百度也可以等待我的更新嘎嘎，这里直接上步骤加代码,快速实现一个简单的web页面
1、目录下创建一个app.py文件输入下面代码
from flask import Flask,request,render_template
from study.logging.generation_log import generation_log,red_logs
app = Flask(__name__)
line_number = [0]
@app.route('/get_log',methods=['GET','POST'])
def get_log():
log_data = red_logs()
if len(log_data) - line_number[0] > 0:
log_type = 2
log_difference = len(log_data) - line_number[0]
log_list = []
for i in range(log_difference):
log_i = log_data[-(i+1)].decode('utf-8')
log_list.insert(0,log_i)
else:
log_type = 3
log_list = ''
_log = {
'log_type' : log_type,
'log_list' : log_list
}
line_number.pop()
line_number.append(len(log_data))
return _log
@app.route('/generation_log',methods=['GET','POST'])
def generation_log_():
if request.method == 'POST':
generation_log()
return ''
@app.route('/',methods=['GET','POST'])
def index():
if request.method == 'GET':
return render_template('index.html')
if request.method == 'POST':
return render_template('index.html')
if __name__ == "__main__":
app.run(debug=True)
2、目录下创建一个templates目录
3、在templates目录下新建一个index.html文件，并输入下面前端代码
DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Titletitle>
<style>
body{
margin: auto;
background-color: #f5f5f5;
}
.button{width: 200px;height: 50px;color:#FFFFFF;background-color: #1da1f2}
.log{
width: 98%;
height: 500px;
background-color: #FFFFFF;
margin: 0 auto;
margin-top: 10px;
padding-top: 30px;
padding-bottom: 40px;
}
.log_text{
height: 500px;
margin-left: 80px;
font-size: 18px;
color: #111111;
overflow-x: hidden;
overflow-y: auto;
}
style>
head>
<body>
<button id="button" class="button">开始button>
<div class="log">
<div class="log_text" id='log_list'>
<div id="log_text">div>
div>
div>
body>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js">script>
<script>
var time
function insertAfter( newElement, targetElement ){
var parent = targetElement.parentNode;
parent.appendChild( newElement, targetElement );
};
function log(){
clearTimeout(time)
var log_null = 0
var div = document.getElementById('log_list')
div.innerHTML = ""
$.post('/generation_log',{},function (){
})
time = setInterval(function (){
$.get('/get_log',{},function (data){
if (data.log_type == 3){
log_null ++
if (log_null >= 5){
clearTimeout(time)
}
return
}
if (data.log_type == 2){
for (i=0;i<data.log_list.length;i++){
var p = document.createElement("p")
p.innerHTML = data.log_list[i]
var header = document.getElementById('log_text')
insertAfter(p,header)
div.scrollTop = div.scrollHeight
}
log_null = 0
}
})
},1000)
}
document.getElementById('button').addEventListener("click",log)
script>
html>
四、启动服务
1、查看项目目录，代码是否编写齐全
2、启动app.py文件
4、点击开始即可
Original: https://blog.csdn.net/liuage_/article/details/124062985
Author: liuage_
Title: python + Flask实现日志在web网页实时更新显示
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