Can i get the username of the currently looged in person using applets. If yes, how can i use the applet in my dynamic web project?
I know in I.E we can do like this
var objUserInfo = new ActiveXObject("WScript.network");
document.write(objUserInfo.ComputerName+"<br>");
document.write(objUserInfo.UserDomain+"<br>");
document.write(objUserInfo.UserName+"<br>");
var uname = objUserInfo.UserName;
alert(uname);
but i want it using applet so that it will work in any browser.
Be aware that this is in fact an attempt to circumvent the browser security.
look at the answer to this similar (but not excactly the same) question.
http://www.coderanch.com/t/243316/Applets/java/windows-NT-login-applet
ActiveX will not run properly in Chrome / Firefox.
Javascript won't (due to security reasons) allow you to get that information from the operating system.
Flash is cross browser, and can be used for this, but it is difficult to get around chromes sandbox.
so my best suggestion is java.
Here is a similar question that is answered on why you can't without an applet.
https://security.stackexchange.com/questions/36728/can-your-windows-or-linux-username-be-exposed-to-websites
And the provided link from an answer to another similar question points to a java solution, but there are limits to the success:
http://www.rgagnon.com/javadetails/java-0441.html
However I think you should start from there, and then post a solution here when it works ;)
See the problem here is that when the applet tries to interact with local resources the browser must allow it, or block it..
Security settings in IE, may prevent that if set to high, and Chromes sandbox may block it if you do it wrong. I don't know of problems with Firefox or Safari, but I guess you'll find them when testing...
Good luck.
Related
I have an applet that receives an XML that serialized a JasperPrint object and print it using printservices. The applet is signed and the certificate is imported in house.
This applet is in a Web application that call it using javascript and it runs in terminals with Windows XP.
The problem is that when you use the applet always displays the prompt to run the application and users have to confirm to print.
Is there any way around this without ever having to confirm?
UPDATE:
i google the problem and i see that applet is dying (like #user3712670 says),
there are another alternative to run java code on client pc from a web page?
i need to use it locally
Short answer: no.
Any settings for those confirmation dialogs are client-side, so there's nothing you can do in your code or on your server to prevent them.
You might be able to get rid of some of them by making your clients change their security settings, but this is probably not advised. And you probably can't get rid of all of them.
You can check the plugin settings for the particular browser you're running, and you can check the Java security settings from the Control Panel.
The real answer is that applets are a dying technology, and trying to make them work is a bit like plugging up the holes in a sinking ship.
I would like to know if it's possible to edit a file from within the browser. I know where the file is and I know its format. I would like to some HTML5 and JavaScript but have little luck so don't mind using Flash or Java.
The file I would like to edit is the hosts file. C:\WINDOWS\system32\drivers\etc\hosts on Windows XP.
This is mostly for test run of a new breed of AdBlocking so would like to give my browser and the best chance of working. I have Google Chrome Dev opened as ROOT, running on Windows XP.
Java applet with the correct permissions can access the file probably but how easy is it for the user to setup those permissions is a question I can not answer.
Flash is not going to work 100% as it can not be loaded from the internet and access the hard drive at the same time, without going into details you can trust me on that one as the security model simply does not allow it and there is no actual API inside flash to read the file, one can only forward it through to a server(only upload, no download), nothing more (if running from the internet sandbox).
Javascript - not sure, i kind of feel like it can't for similar reasons as Flash but somebody should probably confirm.
The add-blockers usually work as addons to the browser so you should probably do the same as you should have access but then again, you probably won't need it in that case...
In any case, Flash definitely is not going to work.
Java applets can as long as they are signed ..
Follow these intructions to sign an applet.
P.S these instructions are for a linux setup. You might need to set up environment variables in windows.
Jar signing link
so al long as the users allow the applet to run the applet the applet can modify anything on the file sysem and even open connections to other computers.. and most importantly the applet can be hidden in a corner if that is what you wish
Editing local files from a browser, especially a system file, is something that all browser vendors actively try to PREVENT. This is because all the virus makers are actively trying to edit these too!
If you want an ad blocker editing the hosts file to do it is a terrible idea for a number of reasons. First of all it is only going to work on Windows and your ad blocking won't help for Mac and Linux users. Second it will require permissions escalation on Vista and Windows 7. Third it would have to be reliant on something like ActiveX or Java. Fourth the hosts file would eventually get large. Large hosts file slow down internet browsing because you have to do a full lookup every time.
If you want to block ads, block them at the browser level. I hope I have convinced you that modifying the hosts file for this is a bad idea.
Is there any script or code that solves this problem?
Simply I have an image player in my web site which does not work in IE9. I know there is a solution (Java Applet Not Working (Blank) in IE9) which remove the problem, but if a user have not sufficient knowledge of how Windows works, or the web site is just play on outdoor screens, it need to be fixed with code by developer. Here is my website: http://www.interactivity.com.au/
Do you know any solution on Windows?
Since in a nutshell, the reason they're not working is that they're being blocked by a security feature, by definition there's no way for your applet to get around it. If there was, then it'd be a bug in the filter, and if such a way was found, you'd expect the filter to then be fixed to prevent it.
Add a link on your site to a set of instructions on how to fix the problem.
I want to read the web address of all open windows. As soon as the window closes, I should know it too.
One way to do this is by asking the user to download a firefox plugin. This plugin should monitor the user web address.
But is this possible? How to go about executing it. I am pretty decent in Java and PHP.
EDIT:
What if the user wants to give permission to access all the websites he or she visits?
I want to display in a visual manner the statistics of the sites being visited by users who grant permission.
As noted, this cannot be done with standard JavaScript/DOM methods that run inside a page, for security and privacy reasons.
You could definitely do it with a Firefox add on, plugin or extension.
I suggest reading the Firefox addons developer guide and the Developer Hub in general. The language used to develop for Firefox is JavaScript.
nsIWindowMediator can be used to enumerate open windows, and properties can be obtained through the nsIDOMWindow objects. As explained here,
"While you can use JavaScript to get child windows opened from the parent window, you cannot get dialogs or windows that have no relation to that window. To overcome this limitation, nsIWindowMediator makes it possible to access all of Firefox's windows."
this likely violates the same origin policy, which rules this out
it basically controls the code so that it does not read anything it did not create
so no spying can be done
No, this would be a major security and privacy issue.
This is definitely a security violation similar to sniffing; and would require certain privileges to run on each platform (such as an activeX or plugin or a privileged applet).
However, this can be done using javascript only the page containing the script it self is responsible for opening windows (meaning not all windows such as window opened by user) - if that is what you are looking for, let me know.
Although I've been programming for a few years I've only really dabbled in the web side of things, it's been more application based for computers up until now. I was wondering, in java for example, what library defined function or self defined function I would use to have a program launch a web browser to a certain site? Also as an extension to this how could I have it find a certain field in the website like a search box for instance (if it wasnt the current target of the cursor) and then populate it with a string and submit it to the server? (maybe this is a kind of find by ID scenario?!)
Also, is there a way to control whethere this is visible or not to the user. What I mean is, if I want to do something as a background task whilst the user carries on using the program, I will want the program to be submitting data to a webpage without the whole visual side of things that would interrupt the user?
This may be basic but like I say, I've never tried my hand at it so perhaps if someone could just provide some rough code outlines I'd really appreciate it.
Many thanks
I think Selenium might be what you are looking for.
Selenium allows you to start a Web browser, launch it to a certain website and interact with it. Also, there is a Java API (and a lot of other languages, by the way) allowing you to control the launched browser from a Java application.
There are some tweaking to do, but you can also launch Selenium in background, using a headless Web browser.
as i understand it you want to submit data to a server via the excisting webinterface?
in that case you need to find out how the URL for the request is build and then make a http-call using the corresponding URL
i advice reading this if it involves a POST submit