i want to upload image in spring mvc in file system. i can do it but when redeploy the project all image remove from directory. now my question is how upload image permanently?i want this in real application.
You probably uploaded your images under your project directories/war. Every time you deploy/build your project/war, the images got deleted.
You need to save the image files outside of your project/war.
For real application, I suggest you at least save/serve your uploaded images in a separate server. Amazon S3 is a pretty good one. You can just store the object/file name relative to S3 base url in your database. They have java APIs for you to upload the files too.
As mentioned, in order to persist these uploaded images it is best to save them outside of your project/.WAR file. The reason for this is as you've already experienced, each time you redeploy your application you will loose anything (i.e. your uploaded images) that had been written to the previous project/.WAR when it was deployed.
The provided solution of utilizing an Amazon S3 bucket to save these images is a good solution and you could definitely accomplish what you desire (having a URL of www.example.com/upload/ showing all these images). With springMVC within your controller you can set up a method and assign the #RequestMapping annotation like so:
#Controller
#RequestMapping("/") //this can map to your www.example.com
public class MainController(){
#RequestMapping("/upload") //this will then map to www.example.com/upload
public String showUploads(){
return "redirect:http://pathToAmazonS3Bucket"
}
}
In SpringMVC the redirect allows you to redirect to an absolute URL path. See docs
But as already mentioned you still have to host your images somewhere outside of your project path/WAR file. Amazon S3 works, but since you asked for another solution here is one.
You can save all the images to a file on your PC, then run Python3 or Node as HTTP servers. This solution though requires you to utilize your computer and your internet connection to host your images on the web. This assumes you are good with leaving your PC running non-stop or have an old one laying around that you will use as your webserver. It also assumes your ISP is okay with you hosting a webserver on your network. Lastly you can obtain your own unique URL from numerous services online (some free and some for small fees), this way people dont have to type in your IP address.
I am running a similar setup above on my network with a free domain name from No-IP.com.
Also, how do you plan to host your spring web application on the web? Will you be doing this via an online hosting service or hosting yourself? If hosting yourself, will you use Apache Tomcat or Glassfish or another container/application server?
Related
The problem with files is if i have bulk of users i should download images for every user in a certain folder and pass them to jsp.which is unfriendly.Is there any way.
Well, you can create a separate controller which serves images directly from the database, and then use the path of this controller in all of your JSPs. This way you will not need to "preload" the images into some local directory.
In case this happens to be slow, configure some kind of caching layer in front of the application in nginx or apache httpd.
My app runs on JBoss EAP and I want to upload images to the OPENSHIFT_DATA_DIR and then save their relative paths in the MySQL DB because I need to construct a path to the images and later serve them to the browser when needed.
If my OPENSHIFT_DATA_DIR path is /var/lib/openshift/5364c54ce0b8cd80180001f7/app-root/data/ and I want schoolpics/federaluniversity/uniben-1/ inside it to save a file logo.png such that the full path will be
/var/lib/openshift/5364c54ce0b8cd80180001f7/app-root/data/schoolpics/federaluniversity/uniben-1/logo.png
How to achieve this in term of storing in database, and opening using URL of image in a web page, since the OPENSHIFT_DATA_DIR seems to be outside the webroot of the app.
My solution to this issue was to create a servlet that would serve the images from the OPENSHIFT_DATA_DIR, the servlet also supplies a way to write the images to the OPENSHIFT_DATA_DIR also, you can check out this forum post for more information: https://www.openshift.com/forums/openshift/how-to-upload-and-serve-files-using-java-servlets-on-openshift
Our new start-up company is trying to build a mobile app with an accompanied website. We are trying to setup our application on Amazon Web Services.
We have Java code running in an EC2 instance, which will store data in S3. We want clients (iOS and Web for now) to communicate with the Java Backend via a REST API. Ideally the website would be hosted under the same AWS account.
The Java Code and REST API are already set up in a very basic form, but the setup of the Website is unclear, since this is new to us all. We also would like to evaluate beforehand if such a setup is even feasible.
Since I am in charge of the Website i have already spend hours researching this specific setup, but i simply lack experience in cloud/backend development to come to a conclusion.
Here are some questions we would like to answer:
Where would the HTML files and accompanied JavaScript etc. files be stored?
How can data (images etc.) that is stored within S3 by the JAVA code be accessed from the Website directly?
How could something like bootstrapping of data within HTML files be achieved (in JSON format preferably)?
How could the server be set up to compress certain files like CSS or JavaScript?
Please point me into the right direction, any comment is appreciated.
Where would the HTML files and accompanied JavaScript etc. files be
stored?
Either on the same AWS EC2 box or a different one, just give it a static IP and link that IP to the domain you want, done. Just remember to have port 80 open as a firewall rule.
How can data (images etc.) that is stored within S3 by the JAVA code
be accessed from the Website directly?
The files will have some url that you can link to directly in your html so it's essentially just a url.
How could something like bootstrapping of data within HTML files be
achieved (in JSON format preferably)?
You have a number of choices here. You could potentially create some JSP files to generate the HTML and load the JSP files on access and cache them so they load up super fast. You could argue however, this is overkill and in some ways, the REST endpoint should be robust enough to handle the requests.
Part of me thinks you should endeavor to use the REST API for this information so you just have to manage one endpoint, why make an extra endpoint or over engineered solution for the HTML that you then have to maintain? Build once and reuse.
How could the server be set up to compress certain files like CSS or
JavaScript?
During the build process, run the files through a minify process. This is built into maven so you could do it automatically or by hand using something like jscompress. This Minify plugin shows how to automatically minify your resources. Consider you'll need to be using Maven though as your build tool.
I need to upload image to the server, where SmartGWT webapplication is running... after trying this solution ( Basic File upload in GWT - first answer), when I have created independent http servlet with mapping in web.xml, I'm able to receive uploaded file on server side (in linked solution - "out" is ByteArrayOutoutStream), so it is in server RAM... Problem is, how to save file to server file system storage.
When I tried to create FileOutputStream instead of ByteArrayOutoutStream, an exception has been thrown that it is restricted class in Google Apps Engine.
Any ideas, how to store file to server, when it is restricted in GAE? Or how can I tell, that I don't want the FileUploading servlet to run under GAE? Thanks for any ideas...
You have no write permissions. You may, however, store the image as a blob or by using the distributed datastore.
From TFA:
Writing to local files is not supported in App Engine due to the
distributed nature of your application. Instead, data which must be
persisted should be stored in the distributed datastore. For more
information see the documentation on the runtime sandbox.
I am a bit of a GlassFish beginner, so please forgive my ingnorance on the subject.
Basically we are serving a game website, and to make the client downloadable by our web app we copy it into a directory within domain1. The problem with this is that when redeploying the web app the client downloadable is lost and we have to copy it across again.
I'd like to be able to store the client downloadable in some external location and have GlassFish provide access to it.
I could just hardcode the link into the web app, but then we would lose portability so that's the reason for having GlassFish handle it.
I could also put the client downloadable into our database but that seems like poor use of a database and could also result in poor database performance.
The third option I have found is to add a custom resource mapping from some name to the file location, and then provide a method in one of my beans to retrieve the file location. This seems like a lot of work just to have an external resource, I feel like there must be an easier way.
So what should I do?
With GlassFish you can define an alternate document root to serve files from outside the war. From the documentation:
Alternate Document Roots
An alternate document root (docroot)
allows a web application to serve
requests for certain resources from
outside its own docroot, based on
whether those requests match one (or
more) of the URI patterns of the web
application's alternate docroots.
To specify an alternate docroot for a
web application or a virtual server,
use the alternatedocroot_n property,
where n is a positive integer that
allows specification of more than one.
This property can be a subelement of a
sun-web-app element in the
sun-web.xml file or a virtual server
property. For more information about
these elements, see sun-web-app in
Oracle GlassFish Server 3.0.1
Application Deployment Guide.
So you could configure something like this:
<property name="alternatedocroot_1" value="from=/ext/* dir=/path/to/ext"/>
Refer to the documentation for full details.
The link to your downloadables needn't be in the same application as the game servlets, right?
One solution would be to create a new "pseudo" application containing only a web.xml and your static file content. You would of course not deploy it in war form (well, only if you really want to) but just copy the files into the unpacked directory when you want to change content. I use a setup like this to serve a bunch of files from a Web app server I run.
At work, in an "enterprise" kind of environment, we do things differently. We have an Apache HTTPD server working as the front end. It forwards to the app server for stuff that needs to be done in Java, but any static content, as well as cookie management, SSL, load balancing and other "web server-y" stuff is done by HTTPD. This yields a bit of a performance advantage with heavily loaded sites and lots of big but static files. It also lets us split the work among different physical boxes, which again can help with performance.