Is it possible to upload a file in Play! framework only by giving a path in url?
For example I would like to call:
www.mywebsite.com/upload_PATH
It's for me quite important, because I would like to upload and process a lot of data. Selecting manually 1000 files is too much time consuming and I want to write a program which will make it for me :-) I'm using Play with Java.
If upload_PATH is a local file path on your system, it is not a good way to go.
You should write a Play action where you can upload a file, as it is done in this example.
Then, you should write a HTTP client (started by a main Java method) which go through your files and upload then calling the Play! action. You can use the httpclient Apache library for writing the client part.
As nico_ekito wrote www.mywebsite.com/upload_from_local_path won't work
In case of huge amount of files you can create temporary folder on the distant server and upload your files with FTP. Then in your app you'll need only action for post-upload processing, ie. it can check if file is valid and move it to calculated destination and register in database if required.
Other possibility is using some flash/ajax multi uploader for an example swfupload (don't know it, it's just first hit from the search engine). This approach will be better if you are going give the upload possibility to people who you don't want to give any FTP access.
Finally you can mix the solutions -> use uploader instead of FTP and later post-process new items remotely.
Related
When a user clicks a download button (coded in simple Javascript) on my webpage, it triggers a PHP function that calls to a java file. This Java code connects to the database and writes to a text file.
Currently, the code is in development on my local machine. Here is a snippet of the code is currently creating a local text file and writing the information to it:
StreamFactory sf = StreamFactory.newInstance();
sf.loadResource("mapping.xml");
File file = new File("C:\\MyLocal\\foo.txt");
BeanWriter bw = sf.createWriter("fileExport", file);
// writes beans
bw.write("", "");
...
bw.flush(); // flushes to foo.txt located in C:\MyLocal
My question is is it possible to write this dynamically created text file to the user's computer instead of my local, and if so, is it a good web development practice? The benefit this way is that I don't need to store foo.txt on the server that the code will reside. However, I'm not very familiar with web development practices, and did not see a concrete rule on this subject matter.
If it is better to save it to the server and then implement some download code from there, should this be handled within the PHP of the page or the Java backend functions?
It's not possible to write on user's computer filesystem.
Because of javascript security measures, if it wasn't because of this, a malicious website/webapp could write a huge amount of data on users hard drive, or could write malicious scripts.
The option a user has it's to download a file, but a webpage doesn't have direct access to user filesystem.
There was a proposal API for doing something like this, but it was discontinued
https://www.html5rocks.com/en/tutorials/file/filesystem/
Answering to your question: definitely it's not a good practice to try to write files on users filesystem
You should handle the download with Java on the Backend
For a company internal webapp I need a way to access the full path of files on our internal fileserver that the user drag n drops on a dropzone on the website. As the fileserver is mounted in a similar manner on the webserver the path will point to the same file on its side and I can further process the files.
As that is not possible with plain HTML/Java-Script because of security reasons I did some research and it seems, that one viable way to accomplish this would be to embed a java-applet in the HTML code of the website. However .. as this would be my first encounter with java I'd like to confirm if that is actually possible before starting out.
Or alternatively another way to accomplish this task.
It is quite a common question but I can't find an answer to it
I have a simple HTML with an input text box (type=file) and a submit button. On clicking the submit button, I call a js function where I try to get the complete path of the file
var data = $('#fileName').val();
the issue is I am not getting complete file path of the file I am uploading. I know due to security reasons chrome gives me a C:\fakePath\filename and firefox gives me only the fileName. But in case I need a complete path what shall I do?
PS: Further I will make an ajax call and give that file path to the back-end which needs it to read that file using FileReader
You cannot get the complete path! there is no way to do that!! Even though you are on an intranet and you have enough permissions.
A workaround for this is to have a textarea and ask the user to enter the complete path of the file.
In short you can't have the full name of a file once is loaded on server side, you will just have the file name and its content in a raw byte array (among other attributes). This is not a Java thing nor other server side technologies issue, is related to browser implementation (but it looks that IE6 may contain a flaw about this).
Not directly related to your question but caught my attention
PS: Further I will make an ajax call and give that file path to the back-end which needs it to read that file using FileReader
Usually, you can't handle a file upload using ajax because it can lead to security holes. Still, there are some browsers (like Chrome and Firefox) that allows you to send a file using XMLHttpRequest but that isn't allowed on some browsers (like IE8-) so you have to use an iframe in order to make the file ajax uploading work.
In order to avoid handling all these problems, I would advice you to use a third-party js library that handles the ajax file upload. An example is blueimp jQuery file upload that also has Java server side examples (DISCLAIMER: I do not work in this project nor I'm associated with blueimp in any way). Note that using this plugin requires that you have a mid knowledge on HTML/JavaScript/jQuery/Java Server Side so if you're a starter it may take you some time to make it work, but once it does is pretty good.
I dont know which technology you are using.. but you can always get file name once it is uploaded on server (Using php or .net )
your steps to upload should be like below:
1) Upload file to the server (e.z. /uploadedFiles/...filename
2) Create a method which will fetch file name from the uploaded path
3) simply insert file name in to the database (this will give you flexibility to change folder name of uploaded docs in future if required)
Generally filenames are not stored as it is . to avoid name conflict in future. So it is a advisable to always rename your filename by adding minutes & seconds after itsname.
If any doubts do ask.
Hope it helps.
Browsers block the filepath access on javascript for securit reasons.
The behavior makes sense, because the server doesn't have to know where the user stores the file on his computer, it is irrelevant to the upload process.
I'm developing a JSP application, and I want to be able to upload the contents of a directory to the server. So the user will select the directory he wants to upload, and somehow all its contents will be uploaded.
Can't be done with regular HTML/Javascript, you have to use either Java or Flash.
There is no support for this in HTML (only uploading of a single file) so there is nothing you can do in your JSP. If you want to do this in java you will have to have something client side, like a signed Applet or a jar that the user downloads and runs.
Looks like it's time for a Framework! Struts2 can handle this type of jobs well and is easy to start with. Here you can take a look at a File Upload sample.
As said, there is no way to do this in JavaScript/HTML.
If you do not want to use a Java Applet (they are clunky and your users may not have Java installed), you can let people upload a zip file and extract it on the server (there is support for this in the Java standard API). Both Windows and Mac OS allow the clients to zip a folder by right-clicking.
I am trying use a Java Uploader in a ROR app (for its ease of uploading entire directories). The selected uploader comes with some PHP code that saves the files to the server. I am trying to translate this code to Ruby, but am stumped on this point:
PHP has a very convenient superglobal – $_FILES – that contains a hash of all files uploaded to the current script via the HTTP POST method. It appears Ruby does not have a similar resource. Lacking that, what is the best way to access and save the uploaded files?
I am using the JavaPowUpload uploader ( http://www.element-it.com/OnlineHelpJavaPowUpload/index.html ).
ruby on rails allows you use the application root directory to get at the file stored (wherever you have decided to put it) via #{RAILS_ROOT}.
Check out this tutorial. Not the prettiest method, but it should give you an idea of what needs to be done. Once the file is uploaded, it's just a matter of getting the right path and doing your processing from there.