blogCMS整理

一.在urls中写路由

二.返回登录页面(login.html中写前端代码) 

- username(用户名)

- password(密码)

- validCode(验证码)

-submit(提交按钮)

-submit
    -前端:显示的验证码图片
    <div class="col-md-6">
         <img class="validCode_img" src="/get_validCode_img/" alt="" width="200px" height="50px">
    </div>

    

  

-后端:
  方式一:以二进制打开一个图片路径,获取内容 返回给前端
	import os
	path=os.path.join(settings.BASE_DIR,"blog","static","img","egon.jpg")
				
	with open(path,"rb",)as f:
	data = f.read()

  

方式二:导入Image,还是以二进制打开一个图片路径,获取内容,返回给前端
  from PIL import Image
	img=Image.new(mode="RGB",size=(120,40),color="blue")
					
	f = open("validCode.png","wb")
	img.save(f,"png")
					
	with open("validCode.png","rb") as f:
	  data = f.read()

  

方式三:
  from io import BytesIO  //导入文件句柄的对象和Image
					
  from PIL import Image  
  img = Image.new(mode="RGB",size=(120,40),color="yellow")  //创建一个img图片的对象
  f=BytesIO()   //创建一个内存句柄的对象
  img.save(f,"png")
  data = f.getvalue()

  

方式四: //创建一个img对象,获取一个画笔,创建字体font。定义一个列表,用for循环随机取出数字或者字母
  from io import BytesIO
	import random

	from PIL import Image,ImageDraw,ImageFont
	img = Image.new(mode="RGB",size=(120,40),color=(random.randint(0,255),random.randint(0,255),random.randint(0,255)))

	draw = ImageDraw.Draw(img,"RGB") #获取一个画笔
	font = ImageFont.truetype("blog/static/font/kumo.ttf",28)

	valid_list = []
	for i in range(4):
		random_num = str(random.randint(0,9))
		random_lower_zimu = chr(random.randint(65,90))
		random_upper_zimu = chr(random.randint(97,122))

		random_char = random.choice([random_num,random_lower_zimu,random_upper_zimu])

		draw.text([4+i*24,10],random_char,(random.randint(0,255),random.randint(0,255),random.randint(0,255)),font=font)

		valid_list.append(random_char)

	f=BytesIO()  //拿到一个句柄对象
	img.save(f,"png")  //用什么格式保存该图片
	data = f.getvalue()

	valid_str ="".join(valid_list)
	print(valid_str)

	request.session["keepValidCode"]=valid_str
	return HttpResponse(data)


  def index(request):

    return render(request,"index.html")
					
  返回验证码并且把验证码写入session

  三.点击submit提交

  -ajax向后端提交 

    前端:(login.html.)

<script>
    $("#subBtn").click(function () {
        $.ajax({
            url: "/login/",
            type: "POST",
            data: {
                "username": $("#username").val(),
                "password": $("#password").val(),
                "validCode": $("#validCode").val(),
                "csrfmiddlewaretoken": $("[name='csrfmiddlewaretoken']").val(),
            },
            success: function (data) {
                console.log(data);

                var response = JSON.parse(data);
                if (response["is_login"]) {
                    location.href = "/index/"
                }
                else {
                    $(".error").html(response["error_msg"]).css("color", "red")
                }

            }
        })
    })

</script>

  后端:(在views中:)

-判断是否是ajax请求
  if request.is_ajax():
- 获取用户名 密码 验证码
	-username = request.POST.get("username")
	-password = reuqest.POST.get("password")
	-validCode = request.POST.get("validCode")
				
	-判断验证用户信息是否存在
	-login_response = {"is_login":False,"error_msg":None}	
					
	- 前端获取到的验证码和后端session的验证码是否相同
		如果相同:
		  用户名和密码和数据库中是否匹配
		如果不同:
		  obj[error_msg] = "username or password error"
		返回前端
if validCode.upper() == request.session.get("keepValidCode").upper():
    user = auth.authenticate(username=username, password=password)

    if user:
        login_response["is_login"] = True
        auth.login(request, user)

    else:
        login_response["error_msg"] = "username or password error"

else:
    login_response["error_msg"] = "validCode error"

import json

return HttpResponse(json.dumps(login_response))

return render(request, "login.html")

  

  

 

  

 

posted @ 2017-11-20 20:51  NeitherCandidate  阅读(375)  评论(0编辑  收藏  举报