内容目录：
文件上传
验证码+session
文件和图片的上传功能
- HTML Form表单提交，实例展示
views 代码
HTML
- ajax提交
- 原生ajax提交，XMLHttpRequest方式上传
- jQuery Ajax提交
两种提交方式对比
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
.img{
width: 300px;
height: 300px;
}
</style>
</head>
<body>
<iframe id="my_iframe" name="my_iframe" style="display: none" src=""></iframe>
<form id="fo" method="POST" action="/upload/" enctype="multipart/form-data">
<input type="text" id="user" name="user" />
<input type="file" id="img" name="img" onchange="uploadFile3();" />
<input type="submit" />
</form>
<div id="container">
</div>
<a onclick="uploadFile1();" >XMLHttpRequest上传</a>
<a onclick="uploadFile2();" >jQueryAjax上传</a>
<a onclick="uploadFile3();" >测试Iframe</a>
<script src="/static/jquery-1.12.4.js"></script>
<script>
function uploadFile1(){
// 创建表单对象
var form = new FormData();
// 在表单对象中添加：user: 用户输入的用户名
form.append('user',document.getElementById('user').value);
// 在表单对象中添加：img: 文件对象
var fileObj = document.getElementById("img").files[0];
form.append("img", fileObj);
var xhr = new XMLHttpRequest();
// 回调函数，当Ajax请求状态变化时，自动触发
xhr.onreadystatechange = function(){
// xhr.readyState=4 表示，客户端已经将服务器端响应的内容全部获取完毕
if(xhr.readyState == 4){
// xhr.responseText 获取服务器端响应的文本内容，即： views中 return HttpResponse中的内容
var data = xhr.responseText;
console.log(data);
}
};
// 创建异步连接
xhr.open("post", '/upload/', true);
// 发送请求，将form中的数据发送到服务器端
xhr.send(form);
}
function uploadFile2(){
// jQuery对象和dom对象
var fileObj = $("#img")[0].files[0];
var form = new FormData();
form.append("img", fileObj);
form.append("user", 'alex');
$.ajax({
type:'POST',
url: '/upload/',
data: form,// # {'k1': ;'v1'} > send('k1=v1')
processData: false, // tell jQuery not to process the data
contentType: false, // tell jQuery not to set contentType
success: function(arg){
console.log(arg);
}
})
}
function uploadFile3(){
$('#container').find('img').remove();
document.getElementById('my_iframe').onload = callback;
document.getElementById('fo').target = 'my_iframe';
document.getElementById('fo').submit();
}
function callback(){
var text = $('#my_iframe').contents().find('body').text();
var json_data = JSON.parse(text);
console.log(json_data);
if(json_data.status){
// 已经上传成功
// 预览，创建image标签，src指向刚上传的静态文件路径
var tag = document.createElement('img');
tag.src = "/" + json_data.data;
tag.className = 'img';
$('#container').append(tag);
}else{
alert(json_data.error);
}
}
</script>
</body>
</html>
upload.html
from django.shortcuts import render,HttpResponse
import os
import json
# Create your views here.
def upload(request):
if request.method == 'POST':
ret = {'status': False, 'data': None, 'error': None}
try:
user = request.POST.get('user')
# img = request.POST.get('img')
img = request.FILES.get('img')
print(type(img))
from django.core.files.uploadedfile import InMemoryUploadedFile
file_path = os.path.join('static', img.name)
f = open(file_path,'wb')
for chunk in img.chunks():
f.write(chunk)
f.close()
ret['status'] = True
ret['data'] = file_path
except Exception as e:
ret['error'] = str(e)
return HttpResponse(json.dumps(ret))
return render(request, 'upload.html')
def ajax(request):
import time
crruent_time = time.time()
return render(request, 'ajax.html',{'crruent_time': crruent_time})
def xhr_ajax(request):
print(request.GET)
print(request.POST)
return HttpResponse('ok')
views.py
验证码+session
验证码主图片需要导入check_code和一个Monaco.ttf 字体,字体文件放到项目的根目录下
#!/usr/bin/env python
#coding:utf-8
import random
from 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
check_code.py
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form action="/login/" method="POST">
<input type="text" name="username" />
<input type="text" name="pwd" />
<input type="text" name="check_code" />
<img src="/check_code/" onclick="ChangeCode(this);">
<input type="submit" />
</form>
<script>
function ChangeCode(ths){
ths.src = ths.src + '?';
}
</script>
</body>
</html>
login.html
def check_code(request):
import io
from backend import check_code as CheckCode
stream = io.BytesIO()
# img图片对象,code在图像中写的内容
img, code = CheckCode.create_validate_code()
img.save(stream, "png")
request.session["CheckCode"] = code
return HttpResponse(stream.getvalue())
# 代码：生成一张图片，在图片中写文件
# request.session['CheckCode'] = 图片上的内容
# 自动生成图片，并且将图片中的文字保存在session中
# 将图片内容返回给用户
def login(request):
if request.method == 'POST':
input_code = request.POST.get('check_code')
print(input_code.upper(),request.session['CheckCode'].upper())
return render(request, 'login.html')
Views.py
引用url:
http://www.cnblogs.com/wupeiqi/articles/5703697.html