Django的分页器（paginator）

view.py

from django.shortcuts import render,HttpResponse
from app01.models import *
from django.core.paginator import Paginator,EmptyPage                      # 导入分页器Paginator和空白页组件EmptyPage
# Create your views here.
def index(request):
    book_list=Book.objects.all()                                           # 获取全部models对象
    paginator=Paginator(book_list,5)                                       # 将models对象传给分页器,设置每页有五个对象
    # print('count:',paginator.count)                                      # paginator.count为book_list的全部对象个数
    # print('num_pages:',paginator.num_pages)                              # paginator.num_pages为一共有多少页(paginator.count/5)
    # print('page_range:',paginator.page_range)                            # page_range, 一个页码range对象,比如38页: range(1,39)

    try:
        current_page_num=int(request.GET.get('page',1))                    # page为url中问号后的参数页码的值, 如果没有值默认为1
                                                                           # http://127.0.0.1:8000/index/?page=2
        current_page=paginator.page(current_page_num)                      # 获取当前页码的所有对象
    except EmptyPage as e:                                                 # 如果超出page传的参数超过页码范围会出现EmptyPage异常
        current_page = paginator.page(1)                                   # 这里给出默认值1
    if paginator.num_pages > 11:                                           # 这里的if判断是需要前端显示11个页码, 并对三种情况分别判断
        if current_page_num - 5 < 1:
            page_range = range(1, 12)
        elif current_page_num + 5 > paginator.num_pages:
            page_range= range(paginator.num_pages-11,paginator.num_pages+1)
        else:
            page_range = range(current_page_num-5,current_page_num+6)
    else:
        page_range=paginator.page_range
    return render(request,'index.html',locals())

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
    <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<ul>         // 显示对应页码的数据
    {% for book in current_page %}
        <li>{{ book.title }}</li>
    {% endfor %}
</ul>
<nav aria-label="Page navigation">  // 分页器前端显示效果
    <ul class="pagination">
        {% if current_page.has_previous %}
            <li><a href="?page={{ current_page_num|add:-1 }}" aria-label="Previous"><span
                    aria-hidden="true">&laquo;</span></a></li>
        {% else %}
            <li class="disabled"><a href="?page=1" aria-label="Previous"><span aria-hidden="true">&laquo;</span></a>
            </li>
        {% endif %}
        {#        <li><a href="?page={{ current_page_num|add:-1 }}" aria-label="Previous"><span aria-hidden="true">&laquo;</span></a></li>#}
        {% for i in page_range %}
            {% if current_page_num == i %}
                <li class="active"><a href="?page={{ i }}">{{ i }}</a></li>
            {% else %}
                <li><a href="?page={{ i }}">{{ i }}</a></li>
            {% endif %}
        {% endfor %}
    {% if current_page.has_next %}
        <li><a href="?page={{ current_page_num|add:1 }}" aria-label="Next"><span aria-hidden="true">&raquo;</span></a></li>
    {% else %}
        <li class="disabled"><a href="" aria-label="Next"><span aria-hidden="true">&raquo;</span></a></li>
    {% endif %}
    </ul>
</nav>
</body>
</html>