首页 > 代码库 > python 小功能
python 小功能
目录
1、上传文件
2、验证码
一、上传文件
首先了解一下 request.FILES :
字典 request.FILES 中的每一个条目都是一个UploadFile对象。UploadFile对象有如下方法:
1、UploadFile.read():
从文件中读取全部上传数据。当上传文件过大时,可能会耗尽内存,慎用。
2、UploadFile.multiple_chunks():
如上传文件足够大,要分成多个部分读入时,返回True.默认情况,当上传文件大于2.5M时,返回True。但这一个值可以配置。
3、UploadFile.chunks():
返回一个上传文件的分块生成器。如multiple_chunks()返回True,必须在循环中使用chrunks()来代替read()。一般情况下直接使用chunks()就行。
4、UploadFile.name:上传文件的文件名
5、UplaodFile.size:上传文件的文件大小(字节)
django普通版本上传
models.py
class UploadFile(models.Model): username =models.CharField(max_length=50) uploadfile = models.FileField(upload_to=‘./static/‘)#指定的upload目录相对于根目录下media目录 def __str__(self): return self.username
index.html
<form method="post" enctype="multipart/form-data"> <label>用户名:</label><input type="text" name="username" /> <label>文 件:</label><input type="file" name="uploadfile" /> <input type="submit" value="http://www.mamicode.com/‘提交" /></form>
views.py
def index(request): if request.method == ‘POST‘: un = request.POST.get(‘username‘) print(un) f = request.FILES.get(‘uploadfile‘)#‘uploadfile‘与提交表单中input名一致,多个文件参见getlist() filename = os.path.join(‘static‘, f.name) #存放内容的目标文件 # 123 = os.path.join(‘static‘, ‘images‘, filename.name) with open(filename, ‘wb‘) as keys: for chunk in f.chunks():#chunks()方法将文件切分成为块(<=2.5M)的迭代对象 keys.write(chunk) #新数据表信息 models.UploadFile.objects.create(username=un, uploadfile=filename) return HttpResponse(filename + ‘ok‘) return render_to_response(‘index.html‘, {})
django from上传
models.py
class UploadFile(models.Model): username =models.CharField(max_length=50) uploadfile = models.FileField(upload_to=‘./static/‘)#指定的upload目录相对于根目录下media目录 def __str__(self): return self.username
mo.html
<form method="post" enctype="multipart/form-data">{{ uf.username }}{{ uf.uploadfile }} <input type="submit" value="http://www.mamicode.com/‘提交" /></form>
forms.py
from django import formsclass UploadForm(forms.Form): username = forms.CharField() uploadfile = forms.FileField()
views.py
def model(request): if request.method ==‘POST‘: uf =forms.UploadForm(request.POST,request.FILES) if uf.is_valid(): username =uf.cleaned_data[‘username‘] uploadfile=uf.cleaned_data[‘uploadfile‘] u = models.UploadFile() u.username=username u.uploadfile=uploadfile u.save() return HttpResponse(‘ok‘) uf = forms.UploadForm() return render_to_response(‘mo.html‘,{‘uf‘:uf})
Ajax上传文件
html文件
<div> {{ uf.uploadfile }} <input type="button" id="submitj" value="http://www.mamicode.com/提交" /> </div> <script src="http://www.mamicode.com/static/jquery-2.1.4.min.js"></script><script> $(‘#submitj‘).bind("click",function () { var file = $(‘#id_uploadfile‘)[0].files[0]; console.log("fff",file); var form = new FormData(); form.append(‘uploadfile‘, file); $.ajax({ type:‘POST‘, url: ‘/mo/‘, data: form, processData: false, // tell jQuery not to process the data contentType: false, // tell jQuery not to set contentType success: function(arg){ } }) })</script>
views.py
def UploadFile(request): print(request.FILES) uf = forms.uploadForm(request.POST, request.FILES) print(uf.is_valid()) if uf.is_valid(): upoad = models.UploadFile() print(123234) upoad.username = ‘alex‘ upoad.uploadfile = uf.cleaned_data[‘uploadfile‘] upoad.save() return render(request,‘ajax.html‘,locals())
forms.py
from django import formsclass uploadForm(forms.Form): uploadfile = forms.FileField()
models.py
class UploadFile(models.Model): username =models.CharField(max_length=50) uploadfile = models.FileField(upload_to=‘./static/‘)#指定的upload目录相对于根目录下media目录 def __str__(self): return self.username
二、验证码
views.py
import ioimport osfrom django_code import check_codedef check_coder(request): mstream = io.BytesIO() img, code = check_code.create_validate_code() img.save(mstream, "GIF") request.session["CheckCode"] = code ##写入session print(mstream.getvalue()) return HttpResponse(mstream.getvalue())
check_code.py 文件
#!/usr/bin/env python#coding:utf-8import randomfrom PIL import Image, ImageDraw, ImageFont, ImageFilter_letter_cases = "abcdefghjkmnpqrstuvwxy" # 小写字母,去除可能干扰的i,l,o,z_upper_cases = _letter_cases.upper() # 大写字母_numbers = ‘‘.join(map(str, range(3, 10))) # 数字init_chars = ‘‘.join((_letter_cases, _upper_cases, _numbers))def create_validate_code(size=(120, 30), chars=init_chars, img_type="GIF", mode="RGB", bg_color=(255, 255, 255), fg_color=(0, 0, 255), font_size=18, font_type="Monaco.ttf", length=4, draw_lines=True, n_line=(1, 2), draw_points=True, point_chance = 2): ‘‘‘ @todo: 生成验证码图片 @param size: 图片的大小,格式(宽,高),默认为(120, 30) @param chars: 允许的字符集合,格式字符串 @param img_type: 图片保存的格式,默认为GIF,可选的为GIF,JPEG,TIFF,PNG @param mode: 图片模式,默认为RGB @param bg_color: 背景颜色,默认为白色 @param fg_color: 前景色,验证码字符颜色,默认为蓝色#0000FF @param font_size: 验证码字体大小 @param font_type: 验证码字体,默认为 ae_AlArabiya.ttf @param length: 验证码字符个数 @param draw_lines: 是否划干扰线 @param n_lines: 干扰线的条数范围,格式元组,默认为(1, 2),只有draw_lines为True时有效 @param draw_points: 是否画干扰点 @param point_chance: 干扰点出现的概率,大小范围[0, 100] @return: [0]: PIL Image实例 @return: [1]: 验证码图片中的字符串 ‘‘‘ width, height = size # 宽, 高 img = Image.new(mode, size, bg_color) # 创建图形 draw = ImageDraw.Draw(img) # 创建画笔 def get_chars(): ‘‘‘生成给定长度的字符串,返回列表格式‘‘‘ return random.sample(chars, length) def create_lines(): ‘‘‘绘制干扰线‘‘‘ line_num = random.randint(*n_line) # 干扰线条数 for i in range(line_num): # 起始点 begin = (random.randint(0, size[0]), random.randint(0, size[1])) #结束点 end = (random.randint(0, size[0]), random.randint(0, size[1])) draw.line([begin, end], fill=(0, 0, 0)) def create_points(): ‘‘‘绘制干扰点‘‘‘ chance = min(100, max(0, int(point_chance))) # 大小限制在[0, 100] for w in range(width): for h in range(height): tmp = random.randint(0, 100) if tmp > 100 - chance: draw.point((w, h), fill=(0, 0, 0)) def create_strs(): ‘‘‘绘制验证码字符‘‘‘ c_chars = get_chars() strs = ‘ %s ‘ % ‘ ‘.join(c_chars) # 每个字符前后以空格隔开 font = ImageFont.truetype(font_type, font_size) font_width, font_height = font.getsize(strs) draw.text(((width - font_width) / 3, (height - font_height) / 3), strs, font=font, fill=fg_color) return ‘‘.join(c_chars) if draw_lines: create_lines() if draw_points: create_points() strs = create_strs() # 图形扭曲参数 params = [1 - float(random.randint(1, 2)) / 100, 0, 0, 0, 1 - float(random.randint(1, 10)) / 100, float(random.randint(1, 2)) / 500, 0.001, float(random.randint(1, 2)) / 500 ] img = img.transform(size, Image.PERSPECTIVE, params) # 创建扭曲 img = img.filter(ImageFilter.EDGE_ENHANCE_MORE) # 滤镜,边界加强(阈值更大) return img, strs
文件连接 Monaco.ttf 字体文件
http://www.gringod.com/2006/02/24/return-of-monacottf/
python 小功能
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。