I want to create a voice chat which runs on the web browser.
The basic idea is that when I run the server.jar file, it will listen to a socket for connection, and when I type the ip and port on another computer on web browser(ex. 1.1.1.1:8082), the server will accept the connection and display an voice chat applet. Server.jar should contain all voice handlers. For example, if we have three computers, one with the server running while other two has web browser applet running and connected to the server, user1 talking will transmit over to the server, which then transmit over to user2.
So far, I have the applet and the server, but I am having trouble using the web browser to open the applet. It seems I need to use servlet and apache tomcat for the server side to make this work.
Can anyone confirm that I need to use servlet and apache tomcat to achieve this? Or can anyone suggest a better way to approach this project?
if it's peer-to-peer, everything can be written inside the applet.
Oh and as far as i know, there is no java voip libraries so you're going to have to port one from a C/C++ library or write it yourself.
Related
I want to create web server for (localhost) which:
1-provides HTML code (https://leafletjs.com/)
2-receives requests (Ajax requests) from the client that calls corresponding methods in the backend and their send the result back to the client.
Install an "Apache Tomcat" application server and write a "Servet Application" or use "Java Server Faces". Google for those keywords.
I wrote a german tutorial about this: http://stefanfrings.de/jsf_tutorial/index.html there is a translation link in the upper right corner.
If you do not want to install an application server, then you may prefer to use Jetty, which is basically the same as Tomcat but embedded in your own executable program.
I am invoking applet through JNLP from my application (which is hosted on tomcat server) and it is working fine. Now from applet I need to send the response back to the application or browser.
In my search, I found that we can do this using web socket. But not sure from where to start.
Can you please let me know any idea on this.
I think you need some kind of push notifications. One way of doing this as you already mentioned is with websockets and there are bunch of tutorials on the web as well as a question here on stackoverflow How to implement push to client using Java EE 7 WebSockets?
The second way is with server polling (frequently sending requests and checking for new events/states/subscribers etc.)
Our app heavily makes use of applets to check-in (upload) and check out (download) files from users machine. Can someone please confirm what are the alternatives for applet (as it is going to be deprecated by Oracle in 2018)?
We had the same problem. We were using applets in our web application for printing, scanning etc. on local machines. We solved the problem with a simple Java Web Start client application that has a simple web server embedded (Jetty). Now when user starts the web application the client application is downloaded, if necessary, and started on the local machine. It sits there in a tray and listens for requests from the server side application. Handlers are implemented for different types of requests. When client side receives a request, it hands it over to a responsible handler, which executes its task and creates a response, that is sent back to the server side.
For now, this solution works perfect and we could reuse most of the applet code.
I have a web application running with support for some specific pieces of hardware. This is achieved in the following steps:
User runs a small installer that places java files (and a couple
others) on the client machine. The main piece is a jar called "hardwareManager"
User visits web app. The web app runs a java applet which, due to
a .java.policy file placed during the install, has permission to
interact with the client machine outside the browser sandbox.
The applet checks to make sure the hardwareManager is running,
and if not runs a command to start it.
User interacts with the web app which sends commands to the applet via
javascript. The applet then writes commands to a text file
on the client machine. The text file is constantly monitored by the
hardwareManager which runs any commands it reads in.
This works, but seems clunky. I have a couple ideas on how to improve it, but I don't know which, if any, are even worth trying.
Would it be better to set up the hardwareManager as a socketServer and have the applet connect directly to it, rather than going through text files? Is that even possible?
Is there a way to eliminate the applet altogether and have the javascript talk directly to the hardwareManager? Maybe by writing the hardwareManager to be a local http server? What port should it run on? Do javascript xss limitations fit in here somewhere?
It would be less clunky to start the Java application using Java Web Start. This would remove the need to daemonize or install the Java hardware manager.
Another alternative is to use a built-in browser inside Java. I supose this is not an option, since you depend heavily on Javascript (I suppose to provide a rich client experience).
If you already have to install something on the client machine, why did you make the choice to go with a web application?
Talking from experience: We had a Java EE application which needed to print to PoS printers at the client site. We installed a small "synchronizer" application that connects through SSH and synchronizes all clients files. Afterwards, it loads the JAR and executes the program. This program connects through RMI with the server and subscribes to a JMS queue to receive the print assignments.
Applied to your case: Why not let your Java application connect to the server directly? You can use HTTP, SOAP or even JMS over RMI. You can then launch the hardware command from the server (instead of from the limited JavaScript webbrowser environment). This way, you get tons of features: authentication, buffering of commands, and you can even share hardware between multiple clients.
Schematic:
<----AJAX------> Web browser
ApplicationServer
<---HTTP/SOAP--> Java hardware manager application
You can launch the Java application using Java Web Start, which allows you to update the application automatically (instead of needing to pass every client a new installer).
I am learning Java and am trying to do some experiments with networking Java programs.
I have a program made in 2 parts with a client and a server and it works in local testing but the program actually has usefulness for me and a friend of mine and I want to put the server online so both of us can connect to it and use it.
Where/How can I put the program online and have it running so that the client programs can connect to the ServerSocket with an ip address? (Preferably free)
If you dont want to pay server hosting then I would open a virtual server on my computer, then playaround with modem and forward related port to server ip. I would use a port more than 40000. Then just send your ip and port your friend or update application.
If you really want the application to go live within 5 mins, try Jelastic. If you have built a WAR file, simply sign up with their server,choose a provider closest to your geo location, configure Tomcat and you can upload the WAR file through their fantastic web console. Otherwise if you have some source control system(SVN,GIT etc), you just connect and build it with their Maven console and you can be ready. I used it for my start up(Cloudlabz) and really found it exciting.
Surya
You could also consider the cheapest Rackspace Cloud Server. You'll get a full fledged Linux server (distribution of your choice) for about USD 11/month. I've done that now and then myself to try things out.
Just install Java on it and you're good to go.
http://www.rackspace.com/cloud/cloud_hosting_products/servers/pricing/
http://ideone.com/
is that what you want for this?
This is a free web app for you to run your program online....so you can just paste your code and run it.
On the cloud you could use two different services in order to host your Java application.
IaaS (Infrastructure as a Service). Where you can just rent a specific infrastructure on the cloud and you could install and configure all the services that you need.
PaaS (Platform as a Service). In this case, you still enjoy the infrastructure on the cloud + the service Aaren full pre-configured. It means that you can deploy your application without installing or configuring anything. You just need to deploy your application. You have an example about how it works here. Also, you usually can test your Java apps on the cloud without paying.
You should host the server in Heroku ,they offer a free hosting with limits , I have an app there