I have an application in payara that need to receive thousands of files
I was thinking to manage them using an ftp server to upload the files in a dir created run-time with temporary access.
I was looking to vsftpd, and virtual users, and means that I will need to generate new user by adding them to the users file, using htpasswd format: can someone suggest the best way to do it (I don't like the idea to execute a script on the system called by java).
EDIT
At the moment I'm receiving the files using fileUpload component of primefaces, but it become unusable when more than 1.000 files are selected
That's why I'm not comfortable using any HTML interface
If you're OK with requiring users to use modern browsers, you can use the HTML5 file input attribute multiple, which will open a browser window allowing the user to select multiple files:
<input type="file" name="uploads" multiple>
You can then use Apache's commons FileUpload to parse the HttpServletRequest and extract all the files, then do with them what you want.
This is way easier than setting up an alternative upload mechanism and start syncing it.
Related
I have a requirement to process an external request to populate a HTML form with the parameters mentioned in the URL. This part is working fine. However, the URL also contains paths to files present on the client machine and I want to upload those files from the client machine to the server without user interaction.
Since it is not possible with HTML/Javascript to programatically select files, I tried using the Applet approach using JUpload. However, I am not able to figure out, how to preselect a file on applet initialization. It is not necessary to upload the files right away, but I want atleast to select the files automatically. User can review the info and then submit the form. and files in the applet.
Is it possible with this library? Or direct me to some better path
OK, so I found my answer in a different library with similar name. With Smartwerkz JUpload we can pass a parameter preselectedFiles="filePath" and autostartUpload=true to preselect files and auto upload files without user interaction. I hope it will help someone someday.
I'm trying to use the second "Direct file upload" method described at the end of the page here: http://www.playframework.org/documentation/2.0/JavaFileUpload
How do I implement the required Ajax/Jquery/Js function that will allow me to use this? Can anyone please provide some hits or snippets?
Thanks.
You cannot upload files using AJAX. At least not in browsers that do not support the HTML5 File API. For those browsers you could use some existing file upload control such as Uploadify, Blueimp File upload, Valums File Uploader, ...
Those controls detect whether the browser supports the File API and it will use it. If it doesn't it will use other techniques such as using hidden <iframe>, Flash, Silverlight, ...
How do I mass upload PDF files or a folder with PDF files and save it into my MySQL database using Servlet?
The best you do is to ask user to specify the files using several <input type="file"...> elements on the page. And on submit check if all the files are PDF or not, perform desired action in either case. Or you can check for the PDF extension right away using JavaScript. You can also validate using AJAX, just send an AJAX request to the server on a onBlur event of the input field.
Otherwise, a privileged applet might be able to help a little more than this. For example asking a directory and scanning for all PDF's etc.
I need to show the first slide of a PowerPoint presentation in my jsf app. It must look something like that:
user upload the .ppt file to jsf app
the app take the first slide and converts it to Flash
user sees the converted slide in the separate (not as part of the another page)
I suppose that I couldn't use any external converters because the user of the system will not have them when he uses our system.
Also I'm thinkinig about Flash, not HTML, because the presentation can be dynamic.
Any ideas? Can I do this task or it's impossible and I need to think in another way (maybe restriction for end users - to save presentation as png, but I think that my boss won't like this decision).
Maybe I need to look at .xslt format, maybe it would help?
suppose that I couldn't use any external converters because the user of the system will not have them when he uses our system.
You can truly use external tools since your Java/JSF code runs at the webserver, not at the webclient (webbrowser). All the webbrowser get is just the Java/JSF-generated HTML/CSS/JS code. Open a page in webbrowser, rightclick and View Source and see it yourself. You just install the external tool at the webserver and execute it there.
To upload a file in JSF, you'll need to grab a 3rd party component library since the standard implementation doesn't have an upload component, for example Tomahawk's t:inputFileUpload or the one of whatever component library you're currently already using.
To convert PPT to Flash, execute the appropriate action using external tool in the managed bean action method and store the Flash file somewhere in the local disk file system of the webserver. You can store it in the public webcontent so that it's directly accessible by URL, but those files will be lost whenever you redeploy the webapp. If this shouldn't happen, then store it outside the public webcontent.
I don't have hands on experience with PPT-Flash converters, so I can't recommend a specific one, but Google learns me that there's pretty a lot of choice. There seems to be a Java solution of iSpring.
To display the Flash file, use the HTML <object> element which points to the URL of the Flash file. If the Flash file is stored outside the public webcontent, then you'll need to create a Servlet which gets an InputStream of the file from the local disk file system and writes it to the OutputStream of the response along a correct set of HTTP headers and then let the URL of the <object> element point to that instead.
I'm trying to find something that will let users upload multiple files to a website. The requirements are that it let them easily select multiple files (preferably with something like check boxes) and that it displays a preview of the images they select.
I'd prefer to only use Javascript or Flash if possible, but Java is also an option (this needs to work on platforms where Silverlight isn't available).
So far all I've been able to find are things that use the native file selector (which doesn't show previews on Windows, and makes it unclear that you can select multiple by holding ctrl).
I'm not sure if the preview requirement is even possible, but it's the most important.
This is a firefox solution:
It uses the FileReader javascript object to load, display and upload images.
http://hacks.mozilla.org/2011/01/how-to-develop-a-html5-image-uploader/
It still doesnt show previews in the FileSelection dialog but at least allows you to preview the images before uploading.
And here is a ready made java applet solution:
http://jumploader.com/doc_overview.html
To upload multiple files I use RichFaces rich:fileUpload component.
Concerning the preview, I've got the similar problem and the best I found after couple of days of googling is following.
Alfresco has the same problem and resolved it with :
An open office which runs in server mode (socket) and all the office documents are sent by alfresco to open office in order to convert them in PDF
Those PDF are converted to .swf viewer thanks to SWFTOOLS
This .swf is integrated in the HTML
For images, it uses ImageMagick to create small version of the file I suppose
Personnaly, I will try to implement it this way :
Converting office documents to PDF thanks to open office in socket mode
Transform the first page of the PDF into a PNG thanks to JPedal library
Diplay that PNG to the end user
For images I would perhaps use ImageMagick too ... but for now, I'm using Seam Image.scaleToFit API
I am assuming 2 things here:
1) Some kind of client/enduser will be doing the file upload
2) You get some kind of say on what the client installs on their computer to help make this happen.
If this is the case, my first suggestion would be:
Give them FTP or SFTP client software to upload files. The php page you make can have a link to Filezilla, along with instructions on how to use it. ftp and sftp are THE protocols to use for transferring files. HTTP is just not designed(well) for it, nor are browsers.
Once the user has the (S)FTP client software installed, you can give them URL's to upload files to that are specific to their user account, and you can have a backend script process and load/move files that they upload. It's pretty easy to create a local temporary directory using a server side script, have the client upload files via ftp, then go back to the web browser and click a button that says "Done uploading, please process my stuff".
The browser can even give back confirmations on everything that gets uploaded/processed.