Heim > Artikel > Backend-Entwicklung > Python-Entwicklung [Django]: kombinierte Suche, JSONP, XSS-Filterung
1. Einfache Implementierung
Zugehörige Dateien:
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
76c82f278ac045591c9159d381de2c57 100db36a723c770d327fc0aef2ce13b1 93f0f5c25f18dab9d176bd4f6de5d30e a80eb7cbb6fff8b0ff70bae37074b813 b2386ffb911b14667cb8f0f91ea547a7Title6e916e0f7d1e588d4f442bf645aedb2f 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 {% 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 dc6dce4a544fdca2df29d5ac0ea9906b {% 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 ff6d136ddc5fdfeffaf53ff6ee95f185 {% for row in articles %} 25edfb22a4f469ecb59f1190150159c6{{ row.id }}-{{ row.title }}------[{{ row.article_type.caption }}]-[{{ row.category.caption }}]bed06894275b65c1ab86501b08a632eb {% endfor %} 929d1f5ca49e04fdcb27f9465b944689 36cc49f0c466276486e50c850b7e4956 73a6ac4ed44ffec12cee46588e518a5e article.html
Datenbankstruktur:
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)
Verarbeitungsdateien:
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})
Hinweis: Es ist nicht schwierig, diese Funktion zu implementieren. Das Wichtigste ist, zunächst das URL-Zugriffspfadformat http://127.0.0.1:8000/article/0-0.html zu bestimmen. Die erste 0 stellt das Feld „article_type“ dar und die zweite 0 stellt das Feld „Kategorie“ dar. Wenn es Null ist, bedeutet dies, dass die Suche nach allen Informationen in diesem Feld der erste Schritt zum Erfolg ist ; der zweite Schlüsselpunkt ist das Generieren des Wörterbuchs search_dict für verwandte Suchen. Wenn es 0 ist, bedeutet dies, dass der dritte Schlüsselpunkt ebenfalls eine sehr clevere Möglichkeit ist, den Parameter kwargs erneut an das Frontend zu übergeben Genius!
2. Ein weiterer Versuch (Ladespeicheroptimierung)
Da der ArticleType-Typ die festen Daten des Blogs ist, wird er später nicht geändert, und die Daten können in den Speicher geladen werden, um die Abfrage zu beschleunigen
76c82f278ac045591c9159d381de2c57 100db36a723c770d327fc0aef2ce13b1 93f0f5c25f18dab9d176bd4f6de5d30e a80eb7cbb6fff8b0ff70bae37074b813 b2386ffb911b14667cb8f0f91ea547a7Title6e916e0f7d1e588d4f442bf645aedb2f 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 {% 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 %} 16b28748ea4df4d9c2150843fecfba68 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
Datenbankdatei:
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. Verwenden Sie simple_tag, um den Code zu optimieren
Zugehörige Datei :
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 %} 76c82f278ac045591c9159d381de2c57 100db36a723c770d327fc0aef2ce13b1 93f0f5c25f18dab9d176bd4f6de5d30e a80eb7cbb6fff8b0ff70bae37074b813 b2386ffb911b14667cb8f0f91ea547a7Title6e916e0f7d1e588d4f442bf645aedb2f 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'%} 16b28748ea4df4d9c2150843fecfba68 dc6dce4a544fdca2df29d5ac0ea9906b {% filter_all kwargs 'category'%} {% filter_single category kwargs 'category'%} 16b28748ea4df4d9c2150843fecfba68 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 %} 929d1f5ca49e04fdcb27f9465b944689 36cc49f0c466276486e50c850b7e4956 73a6ac4ed44ffec12cee46588e518a5e article.html
Erstellen Sie das Verzeichnis templatetags und erstellen Sie die Datei filter.py im Verzeichnis:
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)
Hauptinhalt der HTML-Datei:
{% 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'%} 16b28748ea4df4d9c2150843fecfba68 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 %} 929d1f5ca49e04fdcb27f9465b944689 36cc49f0c466276486e50c850b7e4956
JSONP
JSONP (JSON mit Padding) ist ein „Nutzungsmodus“ von JSON, der verwendet werden kann, um das Problem des domänenübergreifenden Datenzugriffs durch Mainstream-Browser zu lösen. Aufgrund der Same-Origin-Richtlinie können Webseiten, die sich auf server1.example.com befinden, im Allgemeinen nicht mit anderen Servern als server1.example.com kommunizieren, mit Ausnahme des HTML-Elements 3f1c4e4b6b16bbbd69b2ee476dc4f83a. Mithilfe dieser offenen Richtlinie des 3f1c4e4b6b16bbbd69b2ee476dc4f83a-Elements können Webseiten dynamisch aus anderen Quellen generierte JSON-Daten abrufen. Dieses Verwendungsmuster wird als JSONP bezeichnet. Bei den mit JSONP erfassten Daten handelt es sich nicht um JSON, sondern um beliebiges JavaScript, das mit einem JavaScript-Interpreter ausgeführt wird, anstatt mit einem JSON-Parser analysiert zu werden.
Prinzip:
- Skript-Tag erstellen
- src=Remote-Adresse
- Die zurückgegebenen Daten müssen im JS-Format sein
- Es können nur GET-Anfragen gesendet werden
1. Was ist die Same-Origin-Richtlinie?
Verarbeitete Dateien:
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-Dateien:
<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>
Hinweis: Wenn Sie auf js klicken, um die Ergebnisse direkt zu erhalten, zeigt der Browser die folgende Fehlermeldung an, weil Nur der Browser. Er akzeptiert die von http://127.0.0.1:8000 gesendeten Informationen, blockiert jedoch direkt die von der Wetter-Website gesendeten Informationen. Gibt es eine Möglichkeit, das Problem zu lösen?
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. Verwenden Sie das src-Attribut des Skript-Tags geschickt
Das Skript-Tag ist nicht von der Same-Origin-Richtlinie betroffen
Verarbeiten von Dateien:
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-Datei:
<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>
Hinweis: Zur Vereinfachung bei JS-Anfragen lautet die aktuelle Programm-URL immer noch angefordert; nach dem Ausführen des obigen Codes werden Sie eine magische Situation finden, auf der Seite werden 123 Informationen angezeigt, die darauf hinweisen, dass das Skript die Informationen erfolgreich erhalten hat
3. Ändern Sie die Vorderseite leicht Back-Ends, um die Verwendung dynamischer zu gestalten
Verarbeitungsdatei:
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-Datei:
<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>
Hinweis: Wenn js eine Anfrage sendet, bringen Sie den Callback-Parameter mit , und definieren Sie dann die dem Parameter entsprechende Methode, und der Hintergrund übergibt die Daten an diese Methode und führt sie aus. Ob sie gedruckt oder angezeigt werden sollen, hängt vom Prinzip und dem Implementierungsprozess von JSONP ab die Implementierung des obigen Codes
4. Beispielanwendung +ajax
Verarbeitung von Dateien:
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-Dateien:
<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> </body>
list({data:[ { "week":"周日", "list":[ { "time":"0030", "name":"通宵剧场六集连播", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0530", "name":"《都市现场》60分钟精编版(重播)", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0630", "name":"《快乐生活一点通》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0700", "name":"《e早晨报》60分钟直播版块", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0800", "name":"精选剧场四集连播", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1120", "name":"《地宝当家》(重播)", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1200", "name":"《都市60分》60分钟直播版块", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1300", "name":"《谁是赢家》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1400", "name":"女性剧场三集连播", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1700", "name":"《快乐生活一点通》精编版", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1730", "name":"《地宝当家》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { 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