线程隔离g对象

作者: Dozing | 来源:发表于2018-11-06 22:35 被阅读1次

线程隔离g对象
Android ThreadLocal源码分析
ThreadLocal
Java 之 ThreadLocal 详解
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Hystrix
ThreadLocal原理解析与注意事项
【JVM 知识体系框架总结】
面试官：JVM 这些我必问

保存全局变量的g属性

g:global

g对象是专门用来保存用户的自定义数据的
g对象在一次请求中的所有的代码的地方，都是可以使用的

# g_demo.py
from flask import Flask,g,render_template,request

from utils import login_log

app = Flask(__name__)


@app.route('/')
def hello_world():
    return 'index'

@app.route('/login/',methods = ['GET','POST'])
def login():
    if request.method == 'GET':
      return render_template('login.html')
    else:
      username = request.form.get('username')
      password = request.form.get('password')
      if username == 'zhiliao' and password == '111111':
        # 就认为当前用户的用户名和密码正确
        g.username = 'zhiliao'
        #login_log(username)
        g.ip = 'xxx'
        login_log()
        return '恭喜!登录成功!'
      else:
        return '你的用户名或密码错误！'


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

# utils.py
from flask import g

# def login_log(username):
#     print('当前登录的用户是：%s' %username)

def login_log():
    print('当前登录的用户是：%s' % g.username)

def login_ip_log():
    pass

<!--templates/login.html-->
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <form action="" method="post">
        <table>
            <tr>
                <td>用户名：</td>
                <td><input type="text" name = "username"></td>
            </tr>
            <tr>
                <td>密码：</td>
                <td><input type="password" name = "password"></td>
            </tr>
            <tr>
                <td></td>
                <td><input type="submit" value = "登录"></td>
            </tr>
        </table>
    </form>
</body>
</html>