# 1.4. 使用Django开发REST 接口
我们以在Django框架中使用的图书英雄案例来写一套支持图书数据增删改查的REST API接口，来理解REST API的开发。
在此案例中，前后端均发送JSON格式数据。
# views.py
from datetime import datetime
class BooksAPIVIew(View):
"""
查询所有图书、增加图书
"""
def get(self, request):
"""
查询所有图书
路由：GET /books/
"""
queryset = BookInfo.objects.all()
book_list = []
for book in queryset:
book_list.append({
'id': book.id,
'btitle': book.btitle,
'bpub_date': book.bpub_date,
'bread': book.bread,
'bcomment': book.bcomment,
'image': book.image.url if book.image else ''
})
return JsonResponse(book_list, safe=False)
def post(self, request):
"""
新增图书
路由：POST /books/
"""
json_bytes = request.body
json_str = json_bytes.decode()
book_dict = json.loads(json_str)
# 此处详细的校验参数省略
book = BookInfo.objects.create(
btitle=book_dict.get('btitle'),
bpub_date=datetime.strptime(book_dict.get('bpub_date'), '%Y-%m-%d').date()
)
return JsonResponse({
'id': book.id,
'btitle': book.btitle,
'bpub_date': book.bpub_date,
'bread': book.bread,
'bcomment': book.bcomment,
'image': book.image.url if book.image else ''
}, status=201)
class BookAPIView(View):
def get(self, request, pk):
"""
获取单个图书信息
路由： GET /books/<pk>/
"""
try:
book = BookInfo.objects.get(pk=pk)
except BookInfo.DoesNotExist:
return HttpResponse(status=404)
return JsonResponse({
'id': book.id,
'btitle': book.btitle,
'bpub_date': book.bpub_date,
'bread': book.bread,
'bcomment': book.bcomment,
'image': book.image.url if book.image else ''
})
def put(self, request, pk):
"""
修改图书信息
路由： PUT /books/<pk>
"""
try:
book = BookInfo.objects.get(pk=pk)
except BookInfo.DoesNotExist:
return HttpResponse(status=404)
json_bytes = request.body
json_str = json_bytes.decode()
book_dict = json.loads(json_str)
# 此处详细的校验参数省略
book.btitle = book_dict.get('btitle')
book.bpub_date = datetime.strptime(book_dict.get('bpub_date'), '%Y-%m-%d').date()
book.save()
return JsonResponse({
'id': book.id,
'btitle': book.btitle,
'bpub_date': book.bpub_date,
'bread': book.bread,
'bcomment': book.bcomment,
'image': book.image.url if book.image else ''
})
def delete(self, request, pk):
"""
删除图书
路由： DELETE /books/<pk>/
"""
try:
book = BookInfo.objects.get(pk=pk)
except BookInfo.DoesNotExist:
return HttpResponse(status=404)
book.delete()
return HttpResponse(status=204)
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# urls.py
urlpatterns = [
url(r'^books/$', views.BooksAPIVIew.as_view()),
url(r'^books/(?P<pk>\d+)/$', views.BookAPIView.as_view())
]
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# 测试
使用Postman测试上述接口
1） 获取所有图书数据
GET 方式访问 http://127.0.0.1:8000/books/， 返回状态码200，数据如下
[
{
"id": 1,
"btitle": "射雕英雄传",
"bpub_date": "1980-05-01",
"bread": 12,
"bcomment": 34,
"image": ""
},
{
"id": 2,
"btitle": "天龙八部",
"bpub_date": "1986-07-24",
"bread": 36,
"bcomment": 40,
"image": ""
},
{
"id": 3,
"btitle": "笑傲江湖",
"bpub_date": "1995-12-24",
"bread": 20,
"bcomment": 80,
"image": ""
},
{
"id": 4,
"btitle": "雪山飞狐",
"bpub_date": "1987-11-11",
"bread": 58,
"bcomment": 24,
"image": ""
},
{
"id": 5,
"btitle": "西游记",
"bpub_date": "1988-01-01",
"bread": 10,
"bcomment": 10,
"image": "booktest/xiyouji.png"
},
{
"id": 6,
"btitle": "水浒传",
"bpub_date": "1992-01-01",
"bread": 10,
"bcomment": 11,
"image": ""
},
{
"id": 7,
"btitle": "红楼梦",
"bpub_date": "1990-01-01",
"bread": 0,
"bcomment": 0,
"image": ""
}
]
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2）获取单一图书数据
GET 访问 http://127.0.0.1:8000/books/5/ ，返回状态码200， 数据如下
{
"id": 5,
"btitle": "西游记",
"bpub_date": "1988-01-01",
"bread": 10,
"bcomment": 10,
"image": "booktest/xiyouji.png"
}
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GET 访问http://127.0.0.1:8000/books/100/，返回状态码404
3）新增图书数据
POST 访问http://127.0.0.1:8000/books/，发送JSON数据：
{
"btitle": "三国演义",
"bpub_date": "1990-02-03"
}
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返回状态码201，数据如下
{
"id": 8,
"btitle": "三国演义",
"bpub_date": "1990-02-03",
"bread": 0,
"bcomment": 0,
"image": ""
}
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4）修改图书数据
PUT 访问http://127.0.0.1:8000/books/8/，发送JSON数据：
{
"btitle": "三国演义（第二版）",
"bpub_date": "1990-02-03"
}
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返回状态码200，数据如下
{
"id": 8,
"btitle": "三国演义（第二版）",
"bpub_date": "1990-02-03",
"bread": 0,
"bcomment": 0,
"image": ""
}
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5）删除图书数据
DELETE 访问http://127.0.0.1:8000/books/8/，返回204状态码