利用Django和装饰器做一个简单的修改密码页面

view视图代码:

from django.shortcuts import render,redirect
from django.http import HttpResponse
from PIL import Image, ImageDraw, ImageFont
from django.utils.six import BytesIO

# Create your views here.
def login_required(view_func):
    def wrapper(request,*view_args,**view_kwargs):
        if request.session.has_key('islogin'):
            return view_func(request,*view_args,**view_kwargs)
        else:
            return redirect('/login')
    return wrapper

def child(request):

    return render(request,'booktest/child.html')

def html_escape(requet):
    return render(requet,'booktest/html_escape.html',{
        'content':'<h1>h1标签<h1>'
    })

def login(request):
    '''显示登录页面'''
    # 判断用户是否登录
    if request.session.has_key('islogin'):
        # 用户已登录, 跳转到首页
        return redirect('/change_pwd')
    else:
        # 用户未登录
        # 获取cookie username
        if 'username' in request.COOKIES:
            # 获取记住的用户名
            username = request.COOKIES['username']
        else:
            username = ''

        return render(request, 'booktest/login.html', {'username':username})

def login_check(request):
    '''登录校验视图'''
    # request.POST 保存的是post方式提交的参数 QueryDict
    # request.GET 保存是get方式提交的参数
    print(request.method)
    # 1.获取提交的用户名和密码
    username = request.POST.get('username')
    password = request.POST.get('password')
    remember = request.POST.get('remember')
    # 2.进行登录的校验
    # 实际开发:根据用户名和密码查找数据库
    # 模拟: smart 123
    vscode = request.POST.get('vscode')
    verifycode = request.session.get('verifycode')
    if verifycode != vscode :
        return redirect('/login')

    if username == 'smart' and password == '123':
        # 用户名密码正确，跳转到首页
        response = redirect('/change_pwd')

        # 判断是否需要记住用户名
        if remember == 'on':
            # 设置cookie username，过期时间1周
            response.set_cookie('username', username, max_age=7*24*3600)

        # 记住用户登录状态
        # 只有session中有islogin,就认为用户已登录
        request.session['islogin'] = True
        request.session['username'] = username
        # 返回应答
        return response
    else:
        # 用户名或密码错误，跳转到登录页面
        return redirect('/login')

@login_required
def change_pwd(request):
    return render(request,'booktest/change_pwd.html')

@login_required
def change_pwd_action(request):
    password = request.POST.get('password')
    username = request.session.get('username')
    return HttpResponse('你的用户名为:%s密码为%s'%(username,password))

def verify_code(request):

    # 引入随机函数模块
    import random
    # 定义变量，用于画面的背景色、宽、高
    bgcolor = (random.randrange(20, 100), random.randrange(
        20, 100), 255)
    width = 100
    height = 25
    # 创建画面对象
    im = Image.new('RGB', (width, height), bgcolor)
    # 创建画笔对象
    draw = ImageDraw.Draw(im)
    # 调用画笔的point()函数绘制噪点
    for i in range(0, 100):
        xy = (random.randrange(0, width), random.randrange(0, height))
        fill = (random.randrange(0, 255), 255, random.randrange(0, 255))
        draw.point(xy, fill=fill)
    # 定义验证码的备选值
    str1 = 'ABCD123EFGHIJK456LMNOPQRS789TUVWXYZ0'
    #随机选取4个值作为验证码
    rand_str = ''
    for i in range(0, 4):
        rand_str += str1[random.randrange(0, len(str1))]
    # 构造字体对象，ubuntu的字体路径为“/usr/share/fonts/truetype/freefont”
    font = ImageFont.truetype('FreeMono.ttf', 23)
    # 构造字体颜色
    fontcolor = (255, random.randrange(0, 255), random.randrange(0, 255))
    # 绘制4个字
    draw.text((5, 2), rand_str[0], font=font, fill=fontcolor)
    draw.text((25, 2), rand_str[1], font=font, fill=fontcolor)
    draw.text((50, 2), rand_str[2], font=font, fill=fontcolor)
    draw.text((75, 2), rand_str[3], font=font, fill=fontcolor)
    # 释放画笔
    del draw
    # 存入session，用于做进一步验证
    request.session['verifycode'] = rand_str
    # 内存文件操作
    buf = BytesIO()
    # 将图片保存在内存中，文件类型为png
    im.save(buf, 'png')
    # 将内存中的图片数据返回给客户端，MIME类型为图片png
    return HttpResponse(buf.getvalue(), 'image/png')