I'm working on a web application. There is one place where the user can upload files with the HTTP protocol. There is a choice between the classic HTML file upload control and a Java applet to upload the files.
The classic HTML file upload isn't great because you can only select one file at a time, and it's quite hard to get any progress indication during the actual upload (I finally got it using a timer refreshing a progress indicator with data fetched from the server via an AJAX call). The advantage: it's always working.
With the Java applet I can do more things: select multiple files at once (even a folder), compress the files, get a real progress bar, drag'n'drop files on the applet, etc...
BUT there are a few drawbacks:
UrlConnection
class with HTTPS, so I use the Apache common HTTP client to do the actual HTTP upload. It's quite big a package and slows down the download of the .jar file I've been maintaining this Java applet for a while but now I'm fed up with all the drawbacks, and considering writing/buying a completely new component to upload theses files.
Question
If you had the following requirements:
What technology/compontent would you use?
Edit :
I implemented something very recently in Silverlight.
Basically uses HttpWebRequest to send a chunk of data to a GenericHandler.
On the first post, 4KB of data is sent. On the 2nd chunk, I send another 4K chunk.
When the 2nd chunk is received, I calculate the round trip it took between first and 2nd chunk and so now the 3rd chunk when sent will know to increase speed.
Using this method I can upload files of ANY size and I can resume.
Each post I send along this info:
[PARAMETERS] [FILEDATA]
Here, parameters contain the following: [Chunk #] [Filename] [Session ID]
After each chunk is received, I send a response back to my Silverlight saying how fast it took so that it can now send a larger chunk.
Hard to put my explaination without code but that's basically how I did it.
At some point I will put together a quick writeup on how I did this.
I've never used it with files of 2GB in size, but the YUI File Uploader worked pretty well on a previous project. You may also be interested in this jQuery Plugin .
That said, I still think the Java Applet is the way to go. I think you'll end up with less portability and UI issues than you expect and Drag/Drop works great. For the record, Box.net uses a Java Applet for their multi-file quick uploads.
OK this is my take on this
I did some testing with swfupload, and I have my previous experience with Java, and my conclusion is that whatever technology is used there is no perfect solution to do uploads on the browser : you'll always end up with bugs when uploading huge files, going through proxies, with ssl, etc...
BUT :
Thanks for all the answers !!
There are a number of free flash components that exist with nice multiple file upload capability. They make use of ActionScripts FileReference class with a PHP (or whatever) receiver on the server side. Some have recently broken with the launch of FP10 but I know for certain that swfupload will work :)
Hope this helps!
What about these two Jupload http://jupload.sourceforge.net/ and jumploader http://jumploader.com/
Both are java applets but they are also both really easy to use and implement.
谷歌齿轮怎么样?
Easiest way of file upload in java is GOJFileUpload.jar library
Here is the gojfileupload library tutorial:
They give two method
They'll return you HashMap the all file name which you uploaded after uploading at your given destination folder.
There are HTTP/HTTPS upload controls that allow multi-file upload. Here is one from Telerik, which I have found to be solid and reliable. The latest version looks to have most if not all of your feature requirements.
You can upload multiple files with HTTP forms as well, as Dave already pointed out, but if you're set on using something beyond what HTTP and Javascript offers I would heavily consider Flash. There are even some pre-existing solutions for it such as MultiPowUpload and it offers many of the features you're looking for. It's also easier to obtain progress information using a Flash client than with AJAX calls from Javascript since you have a little more flexibility.
You may check the Apache Commons FileUpload package. It allows you to upload multiple files, monitor the progress of the upload, and more. You can find more information here:
http://commons.apache.org/fileupload/
http://commons.apache.org/fileupload/using.html
Good luck
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