Publishing a .jar game online - java

I have created a simple java game and received a .jar file. I want to publish this game online on game websites (flash game websites such as kongregate, miniclip, etc.) but am unaware as how i would go about doing this. I have read that you create an applet to post the game online; but can I do that for a website that i am unable to edit?
TLDR: How to post .jar file on website, & if you do so via applet, can someone who cannot edit the site create an applet for the website?
If it is the latter can someone guide me towards a guide for creating an applet?


How to post .jar file on website, & if you do so via applet, can someone who cannot edit the site create an applet for the website?
Short answer, no. Long answer, nope.
In fact, it surprises me that you would think that you can launch an applet from a site when you cannot edit it! If that were possible, I could insert spam ads in a site that is supposedly under your control!
As to deploying the application:
The best way to deploy a Java desktop application is using Java Web Start. A JWS app. can be launched from a link on a web site.
It is a lot easier to deploy a JWS app. than it is to deploy applets (which, BTW, soon won't be supported in Chrome or IE at all, and are by default blocked in Safari and FF).
You will still need 'edit permission' on the site to launch a JWS app. As well as the ability to add new files to the site (e.g. the Jars(s) & the JNLP file used to launch the app.).
Lastly, either applets or JWS will need to be digitally signed by a valid certificate before there is a good chance of the JRE allowing them to launch.
I have created a simple java..
Not looking so simple now, is it? ;)
Deployment is typically a lot harder than people expect, and in the case of 'simple apps.' harder than they were to code and debug..

Related

I have made a JFrame which I want to put in an HTML script. (I was going to use a JApplet but it has been deprecated)

I'm using IntelliJ IDEA, I have coded a frame which I want to put into an HTML file so I can run it in my browser, how do I do this now that I cannot use JApplet? I have found this documentation: http://docs.oracle.com/javase/tutorial/deployment/webstart/deploying.html and this http://docs.oracle.com/javase/tutorial/deployment/webstart/deploying.html but I am new to programming and find this difficult to follow. I don't know for instance how I would go about putting my class files and the image that I used in a separate directory nor do I know how I go about signing my application so that it will run in a browser.

I want to put into an HTML file so I can run it in my browser,
You can use the Desktop class. This class allows you to access default applications from your desktop.
Read the section from the Swing tutorial o How to Integrate With the Desktop class for more information and working examples.

See Java Plugin support deprecated and Moving to a Plugin-Free Web.
Note that is one of my 'copy/paste comments' that does not explicitly mention JFrame based apps., however the links are still relevant in that Oracle & browser makers would not be phasing out support for applets if they wanted programmers to keep trying to shove rich client apps (e.g. Swing GUIs) into thin client web pages.
OTOH you can offer a JFrame (or a JApplet) to be launched from a link in a web page to end up free floating on the desktop of the user by using Java Web Start.
Even then, it is not a simple matter for the programmer or the end user. The programmer needs to ensure the app is digitally signed using a code signing certificate issued by a CA (usually they are expensive). The end user used to just be able to click the link, 'OK' the prompts produced by the Java virtual machine, and see the app appear on-screen. But now most browsers will download the launch file to the local file system rather than directly hand it to the JVM to be launched. So the user faces an extra step in explicitly finding the downloaded launch file and double clicking it.
This is all due to security concerns related to bugs in the plug-ins that run things in web pages. So if you were to find a way around all these hoops, please let us know. It is a security bug that requires urgent fixing.

Launch an application on button click from a web page

In my web application I need to launch a Windows application installed on client machine when a button in the page is clicked.
I know there are security policies in browsers that avoid this by default, but I also know application that do this. An example could be online meeting, web conferencing applications like WebEx or GoToMeeting.
How they do that?
I'm working with Java, so I'm wondering if Java Applets are an option to achieve this.
Is there some other well known way to solve this issue?
NOTE application execution MUST be allowed by user

The best way to deploy a Java desktop application is using Java Web Start.
And forget applets. Soon Chrome won't be able to load them (along with a number of other plug-ins) at all.

you can achieve it with applet. but user must allow to run it. it is hard to run some extern application from button or link because this is potentially danger behaviour. Remember the applet can not get access to the files on user computer and other servers (unless it is digitally signed)

Can a JNLP file be "use-once"?

We have an app that we use as an applet in our website. Since the latest Java updates, we can't use it because a third party component uses it's own applet loader, and that is being blocked by the runtime. So, we've moved to Webstart, which is working ok, but when a user downloads the JNLP then leaves our site they can access the app by loading the JNLP. So we miss out on the website traffic.
So my question is: is there any way to make a jnlp "use-once" to force a user to come back to the website? Tying it to a session variable? An entry in the database to say when they were last online maybe? Has anyone else done something similar?
Thanks in advance.

Java Web Start is a deployment technology, not a marketing strategy, but some possibilities suggest themselves:
Exploit the features of the <shortcut/> element.
Dynamically load and display site content in your application.
Make it easy to visit your site using the browse() method provided by java.awt.Desktop.

Cannot open Jar file

I've started developing Java applications with NetBeans some days ago and I've created an applet that makes some stuff about linear equations and disequations. That applet is also stored on my server and I load it into a webpage using the <applet /> tag. When I double click the *.jar (generated from NetBeans when I load the project) file on my computer, nothing happens. I know this is a stupid question, I've also read a lot of articles about this question but I didn't solve my problem. What could I do if I want execute that jar file from my computer?

What could I do if I want execute that jar file from my computer?
The easiest way to achieve that is to launch the existing applet free floating using Java Web Start. JWS Can install desktop shortcuts or menu items to launch the app.
Re. suggestions that you have to make it a runnable Jar. That will work if the app. normally is a JFrame or Frame, but it won't work for an applet unless the applet has been written as an hybrid application/applet (and since you did not do that deliberately, no it wasn't).

What is "java web start" used for?

I was reading about java web start from wiki. Can someone please tell me
What is it used for?
A practical application of it; to make its use clearer.
Do other languages like C++ / C# have
anything similar?
Thanks,
Roger

Java Web Start is kind of like a successor to applets - it allows Java programs to be run from your browser (though unlike applets, they don't run within the browser). For a practical example, see the TopCoder Arena.
http://www.topcoder.com/contest/arena/ContestAppletProd.jnlp
Here, Java Network Launching Protocol (JNLP) is the protocol that defines how a Web Start application should be run (analogous to HTML telling a browser how a page should be rendered).
See the Oracle tutorials:
Lesson: Web Start
Deploying a Java Web Start Application
Java Network Launch Protocol

Java Web Start software provides the
power to launch full-featured
applications with a single click.
Users can download and launch
applications, such as a complete
spreadsheet program or an Internet
chat client, without going through
lengthy installation procedures.
With Java Web Start software, users
can launch a Java application by
clicking a link in a web page. The
link points to a Java Network Launch
Protocol (JNLP) file, which instructs
Java Web Start software to download,
cache, and run the application.
I'm quoting the Java Tutorial lesson on WebStart
For those of you who work with .Net something like Java Webstart is ClickOnce technology.

Java Web Start is used to write sandboxed desktop applications similar to Java Applets. Like applets they can be launched from a web browser, but they run in their own window - not inside the browser.
It runs just like a normal application, but started from clicking a web page instead of having to download and run an installer. An advantage is that it's very easy to get people who are afraid of all the security warnings to try your application. Another advantage is that you don't need to keep the browser open while you run your application. You can even install a shortcut to your application onto the user's desktop so they don't need to touch the browser at all once they have run it the first time.
The .NET equivalent is Click Once.

What is it used for?
To roll out and keep updated an application to clients. Clients need "only" a Java Runtime installed. This may be more interesting to read.

Java webstart is used to deploy/install Java applications over the network.
The alternative is to send an application (MyApp.jar) to the users who will run that directly. But if it is out-of-date, they could have collisions when the application talks to the server (for example, or other such badness).
It also allows you to package all of the required libraries. This is a HUGE benefit.
http://java.sun.com/javase/technologies/desktop/javawebstart/index.jsp

As mentioned above, it's a technology to allow you to 'push' an always up to date Java app to users. It's not often used on a consumer level, but has some adoption in a corporate atmosphere.
It's best used in somewhat controlled environments, and is especially useful to push a specific version of client software to control a server.

Do other languages like C++ / C# have anything similar?
Yes. Microsoft provides something called ClickOnce that provides a web-based installer.

Today i am looking for the same example about the Java web start...
I thing this link will work for you,i have used as a beginner.
Click Here
As mention With Java Web Start software, users can launch a Java application by clicking a link in a web page. The link points to a Java Network Launch Protocol (JNLP) file, which instructs Java Web Start software to download, cache, and run the application.

We had a project, a plugin for Protégé, which is an ontology editor.
Installing the plugin isn't that hard, but to give the user a quick impression how the plugin worked, we supplied a Java Web Start application on our site. The page is still active, the plugin may have some rough edges, since it hasn't been updated for a while ... http://dac.icore.at/one/solutions.
I'm currently not aware of similar products for C/++/#.

Java web start is the 0-install solution in the java world.
An application built to use Java web start (JWS) will be available as a link in a web site. This site will have the .jnlp extension.
When a user clicks this link (and clicks the "execute" button of his browser) , the javaws.exe runtime will be launched. This executable will download the application and dependencies (libraries, images, and so on) and launch the application using the provided main-class of the .jnlp file).
An extensive reference of JNLP content can be found at http://lopica.sourceforge.net/ref.html
Examples of Java web start applications can be found at Swing sightings.
Notice that, depending upon the chosen configuration, these applciations can also be automatically installed in start menu.

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