I'm working on a spring web mvc project which allows users to upload files. I am saving these uploaded files out of application context so that they persist across deployments. Saving file is working fine. I want to know the best way to convert the file system path to HTTP url so that it can be saved in the database and also used in HTML resource like etc.
Thanks in advance.
As you want to access a file in the filesystem like a static resource using spring mvc, the answer (taken from here) is to serve the static resources adding an entry like in your servlet context:
Example:
<mvc:resources mapping="/images/**" location="file:/absolute/path/to/the/resource/folder/" />
In this case you store all the files in the same path in the same server using only one resource, then you could only store in the db the filename.
In your html tag you need to use a relative url (being aware of your context, so you could access your file like http://yourhost:port/context/resource/yourfile).
In case you want to store files in a different server then you should add another resource origin (but it must be available as a file system path to the other server), so in that case it would make sense to store in the database a value like "resourcename/filename".
Related
I have developed a small web application that runs a web server in golang.
Each user can login, view the list of their docs (previously uploaded) and click on an item to view an html page that shows some fields of the document plus an tag with a src attribute
The src attribute includes an url like "mydocuments/download/123-456-789.pdf"
On the server side I handle the URL ("mydocuments/download/*") via an http Handler
mymux.HandleFunc(pat.Get("/mydocuments/download/:docname"), DocDownloadHandler)
where:
I check that the user has the rights to view the document in the url
Then I create a fileserver that obviously re-maps the url to the real path of the folder where the files are stored on the filesystem of the server
fileServer := http.StripPrefix("/mydocs/download/",http.FileServer(http.Dir("/the-real-path-to-documents-folder/user-specific-folder/)))
and of course I serve the files
fileServer.ServeHTTP(w, r)
IMPORTANT: the directory where the documents are stored is not the static-files directory I sue for the website but a directory where all files end after being uploaded by users.
My QUESTION
As I am trying to convert the code for it to work also on Google Cloud, I am trying to change the code so that files are stored in a bucket (or, better in "sub-directories" -as they do not properly exist- of a bucket).
How can I modify the code so to map the real document url as available via the cloud storage bucket?
Can I still use the http.FileServer technique above (if so what should I use instead of http.Dir to map the bucket "sub-folder" path where the documents are stored)?
I hope I was enough clear to explain my issue...
I apologise in advance for any unclear point...
Some options are:
Give the user direct access to the resource using a signed URL.
Write code to proxy the request to GCS.
Use http.FS with an fs.FS backed by GCS.
It's possible that a fs.FS for GCS already exists, but you may need to write one.
You can use http.FileSystem since it is an interface and can be implemented however you like.
I have a requirement to send the folder details in the URL for POST method, some thing like this
http:///{directory}/{filename}
I am using Spring API to create the service. Using #PathVariables to two variables in the URI.
Problem : Directory can have "/" slashes in it.
Now how can I create my API, please help me.
POST http://example.com/api/files/path/to/my/file/filename
Stick a controller on /api/files. Scrape the URL starting after /files. Use that to locate the file.
P.S. This has the potential to be a Very Bad Idea. Make sure you secure the controller to only expose those parts of your filesystem you don't mind random internet strangers to be able to operate on.
I am currently writing a Go web app using Revel.
My app needs to read the content of an XML file which is stored on the server. At the moment, I store this file in the "public" folder where some other resources (css, js...) lie.
I am using ioutil.ReadFile to read the content of this file. While this is working when the server is run from the main app folder itself, I cannot figure how to access the file when the server is run from another location (say by running "revel run myapp" from $GOPATH).
Is there any way to deal with this situation in revel?
is there a generic way to know the path of the "public" folder?
Any hint would be appreciated.
Thanks! :)
The base path of the application is stored and accessible through revel.BasePath.
The "public" folder can thus be accessed through revel.BasePath + "/public/<...>".
This BasePath value is used, for example, in Static.Serve.
I'm trying to display an image which location was stored in DB. This is
My question is, how can I display this image using af:image, where source is the specific path outside application root?
Write a servlet that reads the image from the database and serves it.
In af:image - set the source to this servlet along with whatever key you wish to use (e.g., /myServlet?photoId=AAAAAAA)
Inside the servlet, make sure that you set the appropriate response headers (like expires, content-type, etc.)
Hope that helps.
if this image accessible by http then you can just write full path to this image (or relative with some "../../" to get to the right upper level).
IDE will complain, but it will work without any problems.
If the image location is an external URL, you can do:
<af:image source="http://some-address.com/someImage.jpg" id="i1" shortDesc="Hi"/>
Possibly you will get a warning in JDeveloper (depends on the version you're using), but if the URL exists and is not forbidden, it will work.
How to use External Directory to Store Images.
And how i access that images thru my Web application ?
I am using Jboss as an application Server.
Web application is in Java,Jsp.
Presently images stored in WAR file.
After google i got the solution
C:\jboss-4.0.0\server\default\deploy\jbossweb-tomcat55.sar\server.xml
Then restart the server and access the
http://localhost:8080/contextname/images
Please provide comments
I've answered similar question before: Simplest way to serve static data from outside the application server in a Java web application
To summarize there are basically two ways:
Add a new Context to the server.xml denoting the absolute location where the images are.
Create a Servlet which gets an InputStream of the image using FileInputStream and writes it the usual Java IO way to the OutputStream of the response, along with at least Content-Type, Content-Length and Content-Disposition headers.
See the link for more detailed answers and code examples.