我试图上传图像与android作为前端和django作为后端。
该模型:
class Photo(models.Model):
title = models.CharField(max_length=255,blank=True)
photo = models.FileField(upload_to='photos')
description = models.TextField(blank=True)
uploaded = models.DateTimeField(auto_now_add=True)
modified = models.DateTimeField(auto_now=True)
class Meta:
db_table = 'media_photos'
def __unicode__(self):
return '%s' % self.title
url url的视图(r'^ photos / upload / $','upload_photo'):
def upload_photo(request):
form=PhotoForm(request.POST,request.FILES)
if request.method=='POST':
if form.is_valid():
image = request.FILES['photo']
title1 =''
new_image = Photo(title=title1,photo=image,description='')
new_image.save()
response_data=[{"success": "1"}]
return HttpResponse(simplejson.dumps(response_data), mimetype='application/json')
现在我想从android访问这里的视图。所以现在我上传图像的android端代码是:
public void doFileUpload(String path){
HttpURLConnection conn = null;
DataOutputStream dos = null;
DataInputStream inStream = null;
String lineEnd = "\r\n";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1*1024*1024;
String urlString = "http://"; // server ip
try
{
//------------------ CLIENT REQUEST
FileInputStream fileInputStream = new FileInputStream(new File(path) );
// open a URL connection to the Servlet
URL url = new URL(urlString);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
// Allow Inputs
conn.setDoInput(true);
// Allow Outputs
conn.setDoOutput(true);
// Don't use a cached copy.
conn.setUseCaches(false);
// Use a post method.
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary="+" ");
dos = new DataOutputStream( conn.getOutputStream() );
dos.writeBytes(lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\";filename=\"" + path + "\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// read file and write it into form...
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0)
{
dos.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(lineEnd);
// close streams
Log.e("Debug","File is written");
fileInputStream.close();
dos.flush();
dos.close();
}
catch (MalformedURLException ex)
{
Log.e("Debug", "error: " + ex.getMessage(), ex);
}
catch (IOException ioe)
{
Log.e("Debug", "error: " + ioe.getMessage(), ioe);
}
//------------------ read the SERVER RESPONSE
try {
inStream = new DataInputStream ( conn.getInputStream() );
String str;
while (( str = inStream.readLine()) != null)
{
Log.e("Debug","Server Response "+str);
}
inStream.close();
}
catch (IOException ioex){
Log.e("Debug", "error: " + ioex.getMessage(), ioex);
}
}
}
但它给了我一个错误:
E/Debug(590): error: java.net.URISyntaxException: Authority expected at index 7: http://
应该是urlString = "http://192.168.1.2/photos/upload";
但是如果它不起作用,你会得到一个不同的错误,我们可能需要该错误才能进一步回答。
此外,您似乎没有真正的边界字符串集,并且您没有正确使用它。
http://stunningco.de/2010/04/25/uploading-files-to-http-server-using-post-android-sdk/,注意他如何使用唯一的边界字符串,并将其写入输出流?
您应该开始将问题标记为已回答。当你这样做时,你会得到更好的成功。
即使你克服了这些困难,你也会违背Django的要求,即你提供一个带有POST参数的csrfmiddlewaretoken。我不知道你如何在Android设备上获得它;通过设计,令牌是为了防止从除Django前端之外的任何东西(即“模板”)调用Django后端代码(即“视图”)。即它旨在阻止你正在尝试做的事情。
您可以在特定视图上禁用csrf功能 - 使用“@csrf_exempt”装饰器。然后你可以决定你是否足够关心安全性,找出你自己的替代品来解决csrf给你的东西。
或者,不是从Android应用程序上传图片,而是编写一个Web应用程序来上传图片,并让您的Django项目提供该Web应用程序。您的Android应用程序可以启动浏览器(作为Intent)并将其指向该Web应用程序。这里有一些代码可以做到:https://simpleisbetterthancomplex.com/tutorial/2016/08/01/how-to-upload-files-with-django.html(它不会赢得任何选美比赛,但确实有效。)