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Python开发【Django】：组合搜索、JSONP、XSS过滤
- 高洛峰asal
- 2017-02-22 10:37:522001semak imbas
1、简单实现
关联文件：
from django.conf.urls import url from . import views urlpatterns = [ url(r'^index.html/$',views.index), url(r'^article/(?P47cf9185b9d6e565a16a5b103ea64946\d+)-(?Pc58a1130350e5f417b7f5c3a9765ab7e\d+).html/$',views.article) ] url.py
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.condition a{
display:inline-block;
padding: 3px 5px;
border: 1px solid black;
}
.condition a.active{
background-color: brown;
}
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9c3bca370b5104690d9ef395f2c5f8d1
6c04bd5ca3fcae76e30b72ad730ca86d
c1a436a314ed609750bd7c7d319db4da过滤条件2e9b454fa8428549ca2e64dfac4625cd
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{% if kwargs.article_type == 0 %}
c1650df1bf28ebb320e3f06f028cceca全部5db79b134e9f6b82c0b36e0489ee08ed
{% else %}
c1650df1bf28ebb320e3f06f028cceca全部5db79b134e9f6b82c0b36e0489ee08ed
{% endif %}
{% for row in article_type %}
{% if row.id == kwargs.article_type %}
8fc2ca070d67d215118cea57248d5115{{ row.caption }}5db79b134e9f6b82c0b36e0489ee08ed
{% else %}
f1c526059e6dca0aec95c389326630c2{{ row.caption }}5db79b134e9f6b82c0b36e0489ee08ed
{% endif %}
{% endfor %}
16b28748ea4df4d9c2150843fecfba68
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{% if kwargs.category == 0 %}
df70f7b565cfeab50f6266d13e7aae74全部5db79b134e9f6b82c0b36e0489ee08ed
{% else %}
df70f7b565cfeab50f6266d13e7aae74全部5db79b134e9f6b82c0b36e0489ee08ed
{% endif %}
{% for row in category %}
{% if row.id == kwargs.category %}
c5fdd0f19c8a956b13936b2ed0f418f2{{ row.caption }}5db79b134e9f6b82c0b36e0489ee08ed
{% else %}
c5fdd0f19c8a956b13936b2ed0f418f2{{ row.caption }}5db79b134e9f6b82c0b36e0489ee08ed
{% endif %}
{% endfor %}
16b28748ea4df4d9c2150843fecfba68
c1a436a314ed609750bd7c7d319db4da查询结果2e9b454fa8428549ca2e64dfac4625cd
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{% for row in articles %}
25edfb22a4f469ecb59f1190150159c6{{ row.id }}-{{ row.title }}------[{{ row.article_type.caption }}]-[{{ row.category.caption }}]bed06894275b65c1ab86501b08a632eb
{% endfor %}
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article.html
数据库结构：
from django.db import models # Create your models here. class Categoery(models.Model): caption = models.CharField(max_length=16) class ArticleType(models.Model): caption = models.CharField(max_length=16) class Article(models.Model): title = models.CharField(max_length=32) content = models.CharField(max_length=255) category = models.ForeignKey(Categoery) article_type = models.ForeignKey(ArticleType)
处理文件：
from . import models
def article(request,*args,**kwargs):
search_dict = {}
for key,value in kwargs.items():
kwargs[key] = int(value) # 把字符类型转化为int类型 方便前端做if a == b 这样的比较
if value !='0':
search_dict[key] = value
articles = models.Article.objects.filter(**search_dict) # 字典为空时表示搜索所有
article_type = models.ArticleType.objects.all()
category = models.Categoery.objects.all()
return render(request,'article.html',{'articles':articles,
'article_type':article_type,
'category':category ,
'kwargs':kwargs})
注：实现此功能并不难，最重要的是理清里面的思路；首先先要确定url访问路径格式http://127.0.0.1:8000/article/0-0.html ，第一个0表示article_type字段，第二个0表示category字段，如果为零时，表示搜索此字段全部信息，确认好这个，是成功的第一步，处理文件上有检索的处理；第二个关键点是生成字典search_dict进行相关的搜索，如果是0表示搜索全部；第三个关键点，也是很巧妙的一个方式，把参数kwargs再次传到前端，简直神来之笔！
2、另一种尝试（加载内存调优）
由于ArticleType类型是博客定死的数据，后期不会做变动，可以把数据加载到内存当中，加快查询速度
76c82f278ac045591c9159d381de2c57
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.condition a{
display:inline-block;
padding: 3px 5px;
border: 1px solid black;
}
.condition a.active{
background-color: brown;
}
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9c3bca370b5104690d9ef395f2c5f8d1
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c1a436a314ed609750bd7c7d319db4da过滤条件2e9b454fa8428549ca2e64dfac4625cd
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{% if kwargs.article_type_id == 0 %}
9d54c0841deaf5461b945d32b7fb4fdc全部5db79b134e9f6b82c0b36e0489ee08ed
{% else %}
9d54c0841deaf5461b945d32b7fb4fdc全部5db79b134e9f6b82c0b36e0489ee08ed
{% endif %}
{% for row in article_type%}
{% if row.0 == kwargs.article_type_id %}
10f3f6439facab4314cfbe4e3175876d{{ row.1 }}5db79b134e9f6b82c0b36e0489ee08ed
{% else %}
a20c8a20660a4e1f867202ed670ff3b0{{ row.1 }}5db79b134e9f6b82c0b36e0489ee08ed
{% endif %}
{% endfor %}
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dc6dce4a544fdca2df29d5ac0ea9906b
{% if kwargs.category_id == 0 %}
73f255b70dccd9c638775a7513655ec1全部5db79b134e9f6b82c0b36e0489ee08ed
{% else %}
73f255b70dccd9c638775a7513655ec1全部5db79b134e9f6b82c0b36e0489ee08ed
{% endif %}
{% for row in category %}
{% if row.id == kwargs.category_id %}
51842ade3c1731ef36f6a85f509e3264{{ row.caption }}5db79b134e9f6b82c0b36e0489ee08ed
{% else %}
51842ade3c1731ef36f6a85f509e3264{{ row.caption }}5db79b134e9f6b82c0b36e0489ee08ed
{% endif %}
{% endfor %}
16b28748ea4df4d9c2150843fecfba68
c1a436a314ed609750bd7c7d319db4da查询结果2e9b454fa8428549ca2e64dfac4625cd
ff6d136ddc5fdfeffaf53ff6ee95f185
{% for row in articles %}
25edfb22a4f469ecb59f1190150159c6{{ row.id }}-{{ row.title }}------[{{ row.article_type }}]-[{{ row.category.caption }}]bed06894275b65c1ab86501b08a632eb
{% endfor %}
929d1f5ca49e04fdcb27f9465b944689
36cc49f0c466276486e50c850b7e4956
73a6ac4ed44ffec12cee46588e518a5e
article.html
from django.shortcuts import render
from django.shortcuts import HttpResponse
# Create your views here.
def index(request):
return HttpResponse('Ok')
from . import models
def article(request,*args,**kwargs):
search_dict = {}
for key,value in kwargs.items():
kwargs[key] = int(value) # 把字符类型转化为int类型 方便前端做if a == b 这样的比较
if value !='0':
search_dict[key] = value
print(kwargs)
articles = models.Article.objects.filter(**search_dict) # 字典为空时表示搜索所有
article_type = models.Article.type_choice
print(article_type)
category = models.Categoery.objects.all()
return render(request,'article.html',{'articles':articles,
'article_type':article_type,
'category':category ,
'kwargs':kwargs})
处理文件.py
数据库文件：
from django.db import models # Create your models here. class Categoery(models.Model): caption = models.CharField(max_length=16) # class ArticleType(models.Model): # caption = models.CharField(max_length=16) class Article(models.Model): title = models.CharField(max_length=32) content = models.CharField(max_length=255) category = models.ForeignKey(Categoery) # article_type = models.ForeignKey(ArticleType) type_choice = [ (1,'Python'), (2,'Linux'), (3,'大数据'), (4,'架构'), ] article_type_id = models.IntegerField(choices=type_choice)
3、利用simple_tag把代码优化
关联文件：
from django.db import models # Create your models here. class Categoery(models.Model): caption = models.CharField(max_length=16) class ArticleType(models.Model): caption = models.CharField(max_length=16) class Article(models.Model): title = models.CharField(max_length=32) content = models.CharField(max_length=255) category = models.ForeignKey(Categoery) article_type = models.ForeignKey(ArticleType) # type_choice = [ # (1,'Python'), # (2,'Linux'), # (3,'大数据'), # (4,'架构'), # ] # article_type_id = models.IntegerField(choices=type_choice) 数据库文件.py
from django.shortcuts import render
from django.shortcuts import HttpResponse
# Create your views here.
def index(request):
return HttpResponse('Ok')
from . import models
def article(request, *args, **kwargs):
search_dict = {}
for key, value in kwargs.items():
kwargs[key] = int(value) # 把字符类型转化为int类型 方便前端做if a == b 这样的比较
if value != '0':
search_dict[key] = value
articles = models.Article.objects.filter(**search_dict) # 字典为空时表示搜索所有
article_type = models.ArticleType.objects.all()
print(article_type)
category = models.Categoery.objects.all()
return render(request, 'article.html', {'articles': articles,
'article_type': article_type,
'category': category,
'kwargs': kwargs})
处理文件.py
{% load filter %}
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c9ccee2e6ea535a969eb3f532ad9fe89
.condition a{
display:inline-block;
padding: 3px 5px;
border: 1px solid black;
}
.condition a.active{
background-color: brown;
}
531ac245ce3e4fe3d50054a55f265927
9c3bca370b5104690d9ef395f2c5f8d1
6c04bd5ca3fcae76e30b72ad730ca86d
c1a436a314ed609750bd7c7d319db4da过滤条件2e9b454fa8428549ca2e64dfac4625cd
dc6dce4a544fdca2df29d5ac0ea9906b
{% filter_all kwargs 'article_type'%}
{% filter_single article_type kwargs 'article_type'%}
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{% filter_all kwargs 'category'%}
{% filter_single category kwargs 'category'%}
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c1a436a314ed609750bd7c7d319db4da查询结果2e9b454fa8428549ca2e64dfac4625cd
ff6d136ddc5fdfeffaf53ff6ee95f185
{% for row in articles %}
25edfb22a4f469ecb59f1190150159c6{{ row.id }}-{{ row.title }}------[{{ row.article_type.caption }}]-[{{ row.category.caption }}]bed06894275b65c1ab86501b08a632eb
{% endfor %}
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73a6ac4ed44ffec12cee46588e518a5e
article.html
创建templatetags目录，在目录下创建filter.py文件：
from django import template from django.utils.safestring import mark_safe register = template.Library() @register.simple_tag def filter_all(kwargs,type_str): print(type_str) if type_str == 'article_type': if kwargs['article_type'] == 0: tmp = 'd0bc4868ae1f1ff1c94f379d51d89899 全部 5db79b134e9f6b82c0b36e0489ee08ed'%(kwargs['category']) else: tmp = '5b4a38184beb11dcff07b41757a60e18 全部 5db79b134e9f6b82c0b36e0489ee08ed'%(kwargs['category']) elif type_str == 'category': if kwargs['category'] == 0: tmp = '53ffd3320390aae5c9a1b7577e83bd73 全部 5db79b134e9f6b82c0b36e0489ee08ed' % (kwargs['article_type']) else: tmp = 'ea4c005b7a5cd7a87c1b4bb223203114 全部 5db79b134e9f6b82c0b36e0489ee08ed' % (kwargs['article_type']) return mark_safe(tmp) @register.simple_tag() def filter_single(type_obj,kwargs,type_str): print(type_str) tmp = '' if type_str == 'article_type': for row in type_obj: if row.id == kwargs['article_type']: tag = '9dba6e1a712676182e9928b187d05ff4%s5db79b134e9f6b82c0b36e0489ee08ed\n'%(row.id,kwargs['category'],row.caption) else: tag = 'd6329b2a69cc11866deec56d01dda4a9%s5db79b134e9f6b82c0b36e0489ee08ed\n' % (row.id, kwargs['category'],row.caption) tmp +=tag elif type_str == 'category': for row in type_obj: if row.id == kwargs['category']: tag = '9dba6e1a712676182e9928b187d05ff4%s5db79b134e9f6b82c0b36e0489ee08ed\n' % (kwargs['article_type'],row.id, row.caption) else: tag = 'd6329b2a69cc11866deec56d01dda4a9%s5db79b134e9f6b82c0b36e0489ee08ed\n' % (kwargs['article_type'], row.id, row.caption) tmp += tag return mark_safe(tmp)
HTML文件主体内容：
{% load filter %}
6c04bd5ca3fcae76e30b72ad730ca86d
c1a436a314ed609750bd7c7d319db4da过滤条件2e9b454fa8428549ca2e64dfac4625cd
4981d39361bc2844bf84fbb6c43c223d
{% filter_all kwargs 'article_type'%}
{% filter_single article_type kwargs 'article_type'%}
16b28748ea4df4d9c2150843fecfba68
4981d39361bc2844bf84fbb6c43c223d
{% filter_all kwargs 'category'%}
{% filter_single category kwargs 'category'%}
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c1a436a314ed609750bd7c7d319db4da查询结果2e9b454fa8428549ca2e64dfac4625cd
ff6d136ddc5fdfeffaf53ff6ee95f185
{% for row in articles %}
25edfb22a4f469ecb59f1190150159c6{{ row.id }}-{{ row.title }}------[{{ row.article_type.caption }}]-[{{ row.category.caption }}]bed06894275b65c1ab86501b08a632eb
{% endfor %}
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JSONP
JSONP(JSON with Padding)是JSON的一种“使用模式”，可用于解决主流浏览器的跨域数据访问的问题。由于同源策略，一般来说位于 server1.example.com 的网页无法与不是 server1.example.com的服务器沟通，而 HTML 的3f1c4e4b6b16bbbd69b2ee476dc4f83a 元素是一个例外。利用 3f1c4e4b6b16bbbd69b2ee476dc4f83a 元素的这个开放策略，网页可以得到从其他来源动态产生的 JSON 资料，而这种使用模式就是所谓的 JSONP。用 JSONP 抓到的资料并不是 JSON，而是任意的JavaScript，用 JavaScript 直译器执行而不是用 JSON 解析器解析。
原理：
- 创建script标签
- src=远程地址
- 返回的数据必须是js格式
- 只能发GET请求
1、什么是同源策略？
处理文件：
import requests
def jsonp(request):
# 获取url信息
response = requests.get('http://weatherapi.market.xiaomi.com/wtr-v2/weather?cityId=101121301')
response.encoding = 'utf-8' # 进行编码
return render(request,'jsonp.html',{'result':response.text}) # response.text 请求内容HTML文件：
<body>
<h1>后台获取的结果</h1>
{{ result }}
<h1>js直接获取结果</h1>
<input type="button" value="获取数据" onclick="getContent();" />
<div id="container"></div>
<script src="/static/jquery-1.8.2.js"></script>
<script>
function getContent() {
var xhr = new XMLHttpRequest(); // 创建对象
xhr.open('GET', 'http://weatherapi.market.xiaomi.com/wtr-v2/weather?cityId=101121301'); // GET方式打开
xhr.onreadystatechange = function () { // 收到返回值时执行
console.log(xhr.responseText);
};
xhr.send() // 发送
}
</script>
</body>注：点击js直接获取结果时，浏览器显示下面报错信息，由于浏览器只接受http://127.0.0.1:8000发过来的信息，对于天气网站发过来的信息直接屏蔽掉了，这就是同源策略，那有没有什么方式可以解决？
XMLHttpRequest cannot load http://weatherapi.market.xiaomi.com/wtr-v2/weather?cityId=101121301. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8000' is therefore not allowed access.
2、巧用script标签src属性
script标签不受同源策略的影响
处理文件：
import requests
def jsonp(request):
# 获取url信息
response = requests.get('http://weatherapi.market.xiaomi.com/wtr-v2/weather?cityId=101121301')
response.encoding = 'utf-8' # 进行编码
return render(request,'jsonp.html',{'result':response.text}) # response.text 请求内容
def jsonp_api(request):
return HttpResponse('alert(123)')HTML文件：
<body>
<h1>后台获取的结果</h1>
{{ result }}
<h1>js直接获取结果</h1>
<input type="button" value="获取数据" onclick="getContent();" />
<div id="container"></div>
<script>
function getContent() {
var tag = document.createElement('script');
tag.src = '/jsonp_api.html';
document.head.appendChild(tag);
// document.head.removeChild(tag);
}
</script>
</body>
注：js请求时为了方便，还是请求的是当前程序url；执行完上面代码会发现一个神奇的状况，页面会弹出123信息，表明script获取信息成功
3、对前后端稍加改造，使用方法更加动态化
处理文件：
def jsonp(request):
return render(request,'jsonp.html') # response.text 请求内容
def jsonp_api(request):
func = request.GET.get('callback') # 获取用户callback参数
content = '%s(10000)'%func # 执行func（10000）函数
return HttpResponse(content)HTML文件：
<body>
<h1>后台获取的结果</h1>
{{ result }}
<h1>js直接获取结果</h1>
<input type="button" value="获取数据" onclick="getContent();" />
<div id="container"></div>
<script>
function getContent() {
var tag = document.createElement('script');
tag.src = '/jsonp_api.html?callback=list'; // 自定义callback参数，与后台达成默契
document.head.appendChild(tag);
// document.head.removeChild(tag);
}
function list(arg){ // 自定义函数与callback=list相对应
alert(arg);
}
</script>
</body>注：js发请求时，带上callback参数，然后定义参数对应的方法，后台会把数据传入此方法内并且执行执行；至于要打印还是弹框，就看用户自己的需求去处理了；jsonp的原理和实现过程就是上述代码的实现
4、实例应用+ajax
处理文件：
import requests
def jsonp(request):
response = requests.get('http://www.jxntv.cn/data/jmd-jxtv2.html?callback=list&_=1454376870403')
response.encoding = 'utf-8' # 进行编码
return render(request, 'jsonp.html', {'result': response.text}) # response.text 请求内容HTML文件：
<body>
<h1>后台获取的结果</h1>
{{ result }}
<h1>js直接获取结果</h1>
<input type="button" value="获取数据" onclick="getContent();" />
<div id="container"></div>
<script src="/static/jquery-1.8.2.js"></script>
<script>
function getContent() {
$.ajax({
url: 'http://www.jxntv.cn/data/jmd-jxtv2.html?callback=list&_=1454376870403',
type: 'POST',
dataType: 'jsonp', // 即使写的type是POST也是按照GET请求发送
jsonp: 'callback',
jsonpCallback: 'list'
});
}
function list(arg){ // 自定义函数与callback=list相对应
console.log(arg);
var data = arg['data'];
for(k in data){
var tr = document.createElement('td');
var week = data[k]['week'];
var list = data[k]['list'];
tr.textContent =week
document.body.appendChild(tr);
console.log(week);
for(i in list){
var name = list[i]['name'];
console.log(name)
}}}
</script>
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