上传图片的写法

<form id="uploadAvatarForm" action="{% url "upl:upload" %}" method="post" enctype="multipart/form-data">
        {% csrf_token %}
        <input type="file" id="uploadAvatar" name="uploadavatarfile">
        <input type="submit" value="submit">
    </form>

form的写法

注意enctype的格式，上传文件需要添加{% csrf_token %}。

from functools import wraps

 

UPLOAD_AVATAR_TEXT = {
    'CHOOSE_IMAGE': 'Choose Image',
    'CROP_IMAGE': 'Crop',
    'TEST_FUNC_NOT_PASSED': 'Forbidden',
    'INVALID_IMAGE': 'Invalid File, Please choose an image',
    'NO_IMAGE': 'Please upload image',
    'TOO_LARGE': 'File Too Large, choose a smaller one',
    'SUCCESS': 'Success',
    'ERROR': 'Error, try later',
}

 

def test_func(request):
    return request.method == 'POST' and request.user.is_authenticated()

 

def protected(func)://装饰符
    @wraps(func)
    def decorator(request, *args, **kwargs):
        if not test_func(request):
            return HttpResponse(
                "<script>window.parent.upload_avatar_error('%s')</script>" % UPLOAD_AVATAR_TEXT['TEST_FUNC_NOT_PASSED']
            )
        try:
            return func(request, *args, **kwargs)
        except UploadAvatarError as e:
            return HttpResponse(
                "<script>window.parent.upload_avatar_error('%s')</script>" % e
            )
    return decorator

 

UPLOAD_AVATAR_MAX_SIZE = 1024 * 1024 * 3

 

import os
import time
import hashlib

CURRENT_PATH = os.path.dirname(os.path.realpath(__file__))
PROJECT_PATH = os.path.dirname(CURRENT_PATH)
ROOT_PATH = os.path.dirname(PROJECT_PATH)

UPLOAD_AVATAR_UPLOAD_ROOT = os.path.join(PROJECT_PATH, 'templates/upload')

@protected
def upload(request):
    try:
        uploaded_file = request.FILES['uploadavatarfile']
    except KeyError:
        raise UploadAvatarError(UPLOAD_AVATAR_TEXT['INVALID_IMAGE'])
    if uploaded_file.size > UPLOAD_AVATAR_MAX_SIZE:
        raise UploadAvatarError(UPLOAD_AVATAR_TEXT['TOO_LARGE'])
    name, ext = os.path.splitext(uploaded_file.name)
    new_name = hashlib.md5('%s%f' %(get_random_string(), time.time())).hexdigest()
    new_name = '%s%s' % (new_name, ext.lower())
    fpath = os.path.join(UPLOAD_AVATAR_UPLOAD_ROOT, new_name)
    with open(fpath, 'w') as f:
        for c in uploaded_file.chunks(10240):
            f.write(c)
    try:
        Image.open(fpath)
    except IOError:
        try:
            os.unlink(fpath)
        except:
            pass
        raise UploadAvatarError(UPLOAD_AVATAR_TEXT['INVALID_IMAGE'])

    if UploadedImage.objects.filter(uid=get_uid(request)).exists():
        old_name = UploadedImage.objects.get(uid=get_uid(request)).image
        old_path = os.path.join(UPLOAD_AVATAR_UPLOAD_ROOT, old_name)
        os.unlink(old_path)//从文件夹删除旧图片
        UploadedImage.objects.filter(uid=get_uid(request)).update(image=new_name)
    else:
        UploadedImage.objects.create(uid=get_uid(request), image=new_name)
    return HttpResponse("success")

调用头像：

def welcome(request):
    s = UploadedImage.objects.get(uid=get_uid(request))
    imgs = "<p><img src='%s'/></p>" % (UPLOAD_AVATAR_URL_PREFIX_ORIGINAL + s.image)
    return render_to_response('welcome.html', {'image': imgs}, context_instance=RequestContext(request))

models.py写法

class UploadedImage(models.Model):
    uid = models.IntegerField(unique=True)
    image = models.CharField(max_length=255)
    upload_date = models.DateTimeField(auto_now_add=True)

    def get_image_path(self):
        path = os.path.join(UPLOAD_AVATAR_UPLOAD_ROOT, self.image)
        if not os.path.exists(path):
            return None
        return path

 

特别注意

settings.py中STATIC_URL 决定访问路径，STATICFILES_DIRS设置访问路径包括的文件夹。

例如STATICFILES_DIRS = (
    'templates',
    os.path.join(os.path.dirname(__file__),  '..', 'static'),
)

STATIC_URL = '/te/'

则UPLOAD_AVATAR_URL_PREFIX_ORIGINAL = '/te/upload/'

可以没有te文件夹。只要根目录下有templates文件夹就可，然后下面有个二级子目录upload。

图片的html页面{% autoescape off %}
{{ image }}
{% endautoescape %}否则会显示转义符