Hello I Create a Java applet and run successfully (when press button the notepad Run) form netbeans but when run the Application from web page the notpad.exe cannot be run
a Java applet run by default in a "sandbox" that means, it can't access to the user's file system and program.
When you try it, in your netbean, it's different because the "sandbox" isn't apply.
What Applets Can and Cannot Do
Maybe it's not allowed for java applets to run notepad on user's computer ?
You have to get applet signed, so that you can access Native programs(.exe). Like said above, Currently its working in sandbox mode. sign the applet and it will work
Related
We are developing a prototype on an old TV box that runs Java applets (via PersonJava JRE 1.1.8). The box runs applets great, no problems.
However, we would like to use appletviewer (from Java 8) to develop locally. However, appletviewer is not able to load images from the documentBase. Images load fine in applet on the TV Box, the problem is in appletviewer.
We understand that applets are deprecated, but we would still like to have a nice development process for this project. Alternatively, are there any other easy ways to run applets in 2021?
In the appletviewer this code:
bgImage = getImage(getDocumentBase(), "myImage.gif");
leads to this error:
java.security.AccessControlException: access denied ("java.net.URLPermission" "http://localhost:8080/applets/hello/myImage.gif" "*:*")
It seems like the appletviewer program is broken. Despite various attempts to set security policies, the appletviewer does not allow downloading images from the remote documentBase (as an applet allows). This makes developing applets a bit challenging, because there is no simple way to run an applet in 2021.
Our solution is to build out the entire code base as an awt.Container, which can be loaded locally into an awt.frame for developement, and then also deployed into an applet for the prototype running on the TV Box. An awt.frame can do most everything an applet can do, so it works well.
Create a file grant-all.policy with the following contents:
grant {
permission java.security.AllPermission "", "";
};
and run the applet with
appletviewer -J-Djava.security.policy=grant-all.policy https://the.url.to/your.applet.html
In the last week I worked with Java Web Start. I can successfully start applications and applets with JWS. But for one project I have to determine how to start multiple applets via JWS, which should not open in browser but in appletviewer.
My searches always came to one result: Appletviewer can only be started over command line. Is that right? Is there no possibility to give an instruction in my HTML page or something like that, which would bring the applet to be started with the appletviewer?
Edit:
Ok, for all those who could search for this in future:
Appletviewer is only for development purposes and the only way to start it is the command line command:
appletviewer myAppletSite.html
But if you really want to start it automatically, you could write an java application to run this system command:
Runtime.getRuntime().exec("appletviewer myAppletSite.html");
My searches always came to one result: Appletviewer can only be startet over commandline. Is that right?
No! In fact, if you launch an applet non embedded using Java Web Start, the JWS client will use the applet viewer to display it.
I am using php. My question is i would like to run a java app that i created and put its jar file in the client side.I would like to run this jar file which is in the client side or ie, in the user desktop with a button click on a HTML page. Is this possible to run it with javascript or with any other web technologies.
Thanks And Regards,
AlenLee MJ
Have a look at Java Web Start. This is a technology to let you start Java applications from the browser that are automatically downloaded from the server.
Alternatively, you could make your program a Java applet, which is a Java program that runs inside the browser.
I have a Java program that runs from command prompt / blueJ's terminal window fine.
Is there a way that I can run this from a browser?
I guess my question is, is there anything that simulates the terminal window in a browser?
If not, do you have a suggestion as to how to put this online? It uses scanner / system.out.println a lot.
Thank you
There are two main technologies for helping publish a Java application via a browser:
Applets (displays inside a browser, kind of like Flash)
Java Web Start (launches via browser, but then runs and displays in a separate window.)
It most most common to use Swing to develop the user interface of an Applet or Java Web Start application. So it might be interesting to read about how to emulate a console window in Swing.
I'm not sure if this helps, but when you access a website that uses Java, with your browser, you can decide to see the Java console, if you have it enabled in your Java settings. But only people with that option turned on will get to see it.
Otherwise you could use javascript to incorporate results into the html of the page, or maybe make an applet with a "console" included.
You can embed in an applet, not only GUI you can use applets to invoke any method. And you can view console view ,[ Java Icon pops up on system tray bar in windows,on right clicking on the java icon, you can view console ]
How can I execute a desktop application from a browser?. I have a web page with a button, when user click this button a simple java desktop application must run. How can I do this using jsp or javascript?
Java Web Start might be your solution.
To start a Java Web Start application, you simply direct the browser to the location of the JNLP file. Basically, the browser detects that instead of simply downloading the file, it should run it in Web Start.
Most major browsers support Java Web Start. Java Web Start is cross platform (works on Mac and PC).
So, in Javascript, it's done simply like this:
window.location = "http://www.examples.com/myapp.jnlp";
You'll also need to sign your Java application, or the user will get a nasty warning.
You should take a look at the Java Web Start technology.
This would be the closest thing: Java Web Start
Managing this through Applets is another option though the underlying scheme is the same, the user needs to accept the generated certificate.