Django实现翻页的示例代码

from django.shortcuts import render
from ApiTest.models import ApiTest
from django.contrib.auth.decorators import login_required
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger, InvalidPage

@login_required
def api_test_manage(request):
 username = request.session.get('user', '')
 # 获取所有接口测试数据
 apitest_list = ApiTest.objects.all().order_by('id')
 # 生成Paginator对象对数据分页，每页显示10条数据
 paginator = Paginator(apitest_list,10)
 # 使用request.GET.get()函数获取url中的page参数的数值。默认第1页
 page = request.GET.get('page', 1)
 # 把获取的当前页码数转换成整数类型
 current_page = int(page)
 try:
  # 获取查询页数的接口数据列表，page()函数会判断page实参是否是有效数字。page()函数源码附在文章的最后
  apitest_list = paginator.page(page)
 except PageNotAnInteger:
  apitest_list = paginator.page(1)
 except (EmptyPage, InvalidPage):
  # paginator.num_pages
  apitest_list = paginator.page(paginator.num_pages)
 return render(request, "apitest_manage.html", {'user': username, 'apitests': apitest_list})

<div class="container">
 <ul class="pagination" id="pager">
  {# 上一页链接 #}
  {% if apitests.has_previous %}
  <li class="previous"><a href="/apitest_manage/?page={{ apitests.previous_page_number }}" rel="external nofollow" >上一页</a></li>
  {% else %}
  <li class="previous disabled"><a href="#" rel="external nofollow"  rel="external nofollow" >上一页</a></li>
  {% endif %}
  {# 中间数字显示 #}
  {%  for num in apitests.paginator.page_range %}
{%  if num == currentPage %}
 <li class="item active"><a href="/apitest_manage/?page={{ num }}" rel="external nofollow"  rel="external nofollow" >{{ num }}</a></li>
{% else %}
 <li class="item"><a href="/apitest_manage/?page={{ num }}" rel="external nofollow"  rel="external nofollow" >{{ num }}</a></li>
{% endif %}
  {% endfor %}
  {# 下一页链接 #}
  {% if apitests.has_next %}{# 如果有下一页，则正常显示下一页链接 #}
<li class="next"><a href="/apitest_manage/?page={{ apitests.next_page_number }}" rel="external nofollow" >下一页</a></li>
  {% else %}
<li class="next disabled"><a href="#" rel="external nofollow"  rel="external nofollow" >下一页</a></li>
  {% endif %}
 </ul>
</div>

class Paginator:
 def __init__(self, object_list, per_page, orphans=0,
  allow_empty_first_page=True):
  self.object_list = object_list
  self._check_object_list_is_ordered()
  self.per_page = int(per_page)
  self.orphans = int(orphans)
  self.allow_empty_first_page = allow_empty_first_page
 def validate_number(self, number):
  """Validate the given 1-based page number."""
  try:
if isinstance(number, float) and not number.is_integer():
 raise ValueError
number = int(number)
  except (TypeError, ValueError):
raise PageNotAnInteger(_('That page number is not an integer'))
  if number < 1:
raise EmptyPage(_('That page number is less than 1'))
  if number > self.num_pages:
if number == 1 and self.allow_empty_first_page:
 pass
else:
 raise EmptyPage(_('That page contains no results'))
  return number
 def get_page(self, number):
  """
  Return a valid page, even if the page argument isn't a number or isn't
  in range.
  """
  try:
number = self.validate_number(number)
  except PageNotAnInteger:
number = 1
  except EmptyPage:
number = self.num_pages
  return self.page(number)
 def page(self, number):
  """Return a Page object for the given 1-based page number."""
  number = self.validate_number(number)
  bottom = (number - 1) * self.per_page
  top = bottom + self.per_page
  if top + self.orphans >= self.count:
top = self.count
  return self._get_page(self.object_list[bottom:top], number, self)
 def _get_page(self, *args, **kwargs):
  """
  Return an instance of a single page.
  This hook can be used by subclasses to use an alternative to the
  standard :cls:`Page` object.
  """
  return Page(*args, **kwargs)
 @cached_property
 def count(self):
  """Return the total number of objects, across all pages."""
  c = getattr(self.object_list, 'count', None)
  if callable(c) and not inspect.isbuiltin(c) and method_has_no_args(c):
return c()
  return len(self.object_list)
 @cached_property
 def num_pages(self):
  """Return the total number of pages."""
  if self.count == 0 and not self.allow_empty_first_page:
return 0
  hits = max(1, self.count - self.orphans)
  return ceil(hits / self.per_page)
 @property
 def page_range(self):
  """
  Return a 1-based range of pages for iterating through within
  a template for loop.
  """
  return range(1, self.num_pages + 1)
 def _check_object_list_is_ordered(self):
  """
  Warn if self.object_list is unordered (typically a QuerySet).
  """
  ordered = getattr(self.object_list, 'ordered', None)
  if ordered is not None and not ordered:
obj_list_repr = (
 '{} {}'.format(self.object_list.model, self.object_list.__class__.__name__)
 if hasattr(self.object_list, 'model')
 else '{!r}'.format(self.object_list)
)
warnings.warn(
 'Pagination may yield inconsistent results with an unordered '
 'object_list: {}.'.format(obj_list_repr),
 UnorderedObjectListWarning,
 stacklevel=3
)

class Page(collections.abc.Sequence):
 def __init__(self, object_list, number, paginator):
  self.object_list = object_list
  self.number = number
  self.paginator = paginator
 def __repr__(self):
  return '<Page %s of %s>' % (self.number, self.paginator.num_pages)
 def __len__(self):
  return len(self.object_list)
 def __getitem__(self, index):
  if not isinstance(index, (int, slice)):
raise TypeError(
 'Page indices must be integers or slices, not %s.'
 % type(index).__name__
)
  # The object_list is converted to a list so that if it was a QuerySet
  # it won't be a database hit per __getitem__.
  if not isinstance(self.object_list, list):
self.object_list = list(self.object_list)
  return self.object_list[index]
 def has_next(self):
  return self.number < self.paginator.num_pages
 def has_previous(self):
  return self.number > 1
 def has_other_pages(self):
  return self.has_previous() or self.has_next()
 def next_page_number(self):
  return self.paginator.validate_number(self.number + 1)
 def previous_page_number(self):
  return self.paginator.validate_number(self.number - 1)
 def start_index(self):
  """
  Return the 1-based index of the first object on this page,
  relative to total objects in the paginator.
  """
  # Special case, return zero if no items.
  if self.paginator.count == 0:
return 0
  return (self.paginator.per_page * (self.number - 1)) + 1
 def end_index(self):
  """
  Return the 1-based index of the last object on this page,
  relative to total objects found (hits).
  """
  # Special case for the last page because there can be orphans.
  if self.number == self.paginator.num_pages:
return self.paginator.count
  return self.number * self.paginator.per_page