Java jar one browser

Java: How to invoke code running on a server from a browser?

Two of the most common ways are Java Servlets (where responses are generated purely via Java code) and Java Server Pages (where server logic is intermingled within HTML, similar to ASP or PHP). I searched on internet and found Java applets, but I read that they aren’t downloaded and executed locally so the program won’t work.

Java: How to invoke code running on a server from a browser?

Is there somehow that I can invoke Java running on a server from a web browser? I would like:

1. User navigates to URL in a browser
2. User fills in input boxes (text)
3. User presses submit button
4. Input fields are sent as parameters to java that is executing on the server
5. A new html page is displayed that was generated by the java running on the server.

What is the standard way to do this, or something similar to this.

I think with PHP this would be relatively simple. I think that you would just pass arguments after the URL like this: www.mysite.com/folder?arguments .

Yes, this is possible (and is extremely common). Two of the most common ways are Java Servlets (where responses are generated purely via Java code ) and Java Server Pages (where server logic is intermingled within HTML, similar to ASP or PHP).

There are countless ways to serve HTML from Java but virtually all of them rely on java servlets and java server pages (JSPs) which are Java’s specification for handling web requests.

The absolute bare minimum to get going:

1. Install Java EE SDK ensuring to also install Netbeans and Glassfish.
2. Launch Netbeans and create a «Java Web» / «Web Application» project
3. Enter a project name, e.g. MyWebApp
4. In the Server and Settings screen, you need to Add. your server so do so. Point to the file location of your Glassfish server and enter the admin name and password
5. Ignore the framework stuff and Finish
6. NetBeans will generate a sample app and you can click straightaway on Run Main Project. It will deploy your app to Glassfish and load http://localhost:8080/MyWebApp/ from your default browser

1. A file called web.xml tells the host server some basics about your web app. This file can contain a lot of other stuff but the default is some boiler plate. The most interesting part says index.jsp which means when you load http://localhost:8080/MyWebApp/ it will default to load index.jsp .
2. The index.jsp is what gets loaded if you don’t specify a page to the server. If you look at index.jsp it’s just HTML with some JSP markup.

Once you know the basics then it’s up to you how deep you go. More advanced topics would be:

1. Taglibraries — these can remove a lot of java clutter and are considered more correct
2. Expressions — using expressions inside JSP pages to reduce the need for messy
3. Custom servlets let you move model / business stuff into a Java class and leave the .jsp to just presentational
4. MVC web frameworks like Struts, Spring etc.
5. Security & filtering

It’s a massive subject but it’s fairly easy to do something quick and dirty.

As a followup to Mark Peters answer, you need a java web server like Tomcat or GlassFish in order to use servlets or jsps. There are a lot of great frameworks for Java that help you abstract away from the original servlet classes, but I’ll let you look those up and decided if you even need them for something this simple.

If you want to pass arguments in a URL, then easier approach is Axis

You can display result with javascript on your page.

Running a java code in Web browser, 1 If you are using Java 6 or above you may want to take a look at JSR 223 (generic scripting for the JDK). Amongst other things, it allows you to run …

Run a java class file from a webpage on the visitor computer?

I coded a Java program to read and modify a file on the computer. The program is based only on 1 class.

At the moment who want to use it has to run it from terminal, I’m looking on how to insert it on a webpage and make it run on the visitor’s computer. It would be fine to have a file chooser (the user will want this modification).

I searched on internet and found Java applets , but I read that they aren’t downloaded and executed locally so the program won’t work.

How to provide a Java class file from a webpage, for use on the computer of the end-user?

If you really want to download a Java program and run it locally, you should check out Java Web Start.

Briefly, it allows the user to download and run a Java program locally on their machine. It does clever stuff like identify if an updated version is available for download, and will run the cached version if that’s the current version.

..it would be fine to have a file chooser ..

In that case, there are basically the two options as I’ve outlined in comments throughout this question & the answers. I’ll collect them together here:

1. Digitally sign the applet, get the user to accept the digitally signed code when prompted (before the applet is loaded), then offer a JFileChooser to browse to the file.
2. If the user has a plugin 2 JRE (chase the links in the JWS info. page for more details), it is possible to deliver the applet to the user unprompted, then leverage the JNLP API to produce a file chooser. The user will be prompted before the dialog appears, this time with a more specific warning.

JWS

• For an example, see my applet based GIF animation tool which uses the JNLP API when the user goes to load image frames or save the animated GIF .
• That applet is not open source (mostly because of my laziness in not wanting to revisit & tidy the code) but there is a much better example of using the JNLP file services that comes complete with source.

Digital signatures

I don’t have any great links about the process of digitally signing code, but note that the ‘example of using the JNLP file services’ listed above provides one set of signed Jars for 2 different security environments. It also (hopefully obviously) demonstrates how to digitally sign code using Ant (it all happens by invoking the default task in the build.xml ).

Applets can modify files locally, if they are signed and the user allows them to.

Read up on signed applets.

I read that they aren’t downloaded and excuted locally

Whereever you read that, it is 100% incorrect. Applets are downloaded into the browser and executed at the client host.

Java — Running A Jar In Browser, Err, applets are classes, and classes are bundled in jar files. So, if you know how to run an applet, that shouldn’t be a problem. Note however that …

How to easily run desktop Java application via browser?

I made a Java desktop application that creates multiple interactive windows. I would like to show it to people not as a download link to a compressed folder archive, but as a program that runs as soon as they open my web site.

Enabling Java Web Start for this project in NetBeans programming environment, gave me launch.html page and launch.jnlp file that starts the application. It works except for a small detail. I need to include icons and additional files next to the JAR file in order to make it fully functional. These files should be perhaps downloaded locally when the web site is opened.

Open the JNLP file and add the required files as resources.

It would be ideal if you packed all your resource files into a single JAR file.

But I wonder why Netbeans wouldn’t add these resources itself.

Run java web application in only one browser, This is done by setting a value for the max-connections attribute for the JBoss Connector. According to the documentation, the max-connections …

Run java web application in only one browser

I would like my web application to run only in one web browser.

E.g. my application URL is: http://localhost:8080/project

I want to restrict this URL in only one browser. If I choose Mozila Firefox for project, this URL can’t run in another browswer like IE, chrome etc.

Why would you want to do that? With Javascript you can detect different browsers and work in accordance.

Anyway, you can check the UserAgent in apache:

RewriteEngine On RewriteCond % (OneMobileUserAgent|AnotherUserAgent|. ) RewriteRule (.*) userAgentA/$1 

Just found a good web with lots of info about the user agent and parsing it. Hope it may help you yo find your ideal solution: https://developer.jboss.org/thread/177392?_sscc=t

As you commented: I´ll try to explain twe two first methods (javascript) and Apache.

Javascript has a system for querying HTTP HEADERS. One of them is the USER_AGENT the client send this header to indentify itselfs. This is obviously used to format webs according to the browser, or to show messages that tell the user to use another browser to see the page.

The user agent is easily detected in javasript with the navigator.userAgent variable you can check. Here you can read more about http://en.wikipedia.org/wiki/User_agent

Also, Apache can check the HTTP_USER_AGENT variable that will be checked in your .htaccess

The .htaccess is a file that will tell apache how to run in a particular directory. There, yoy must use the module «mod_rewrite» that lets you make apache act as a proxy, and then, for example, deny the conection depending on the userAgent detected:

RewriteEngine On //allow access to useragentA RewriteCond % UserAgentA //This line will redirect the user to http://yourdomain.com/webappForuserAgentA RewriteRule (.*) webappForuserAgentA/$1 [P,R,L] //Deny (F) access to userAgentB (it will give the error to the client with the wrong browser RewriteCond % UserAgentB RewriteRule ^.* - [F,L] 

There you have a guide for .htaccess mod_rewrite with apache.

You can set the maximum connections count for your JBoss server. This is done by setting a value for the max-connections attribute for the JBoss Connector .

According to the documentation, the max-connections attribute:

Max of connections supported by the connector.

So, in order to set it, open the jbossweb.sar/server.xml file and set max-connections to 1`

" connectionTimeout="20000" redirectPort="8443" max-connections="1" /> 

With this, JBoss won’t allow a second connection to be established when the first one is still active.

Run Java in your web browser, A Java WebStart application might have such permissions. It would be a similar task to provide a slim IDE. Or making Bluej run from WebStart. …

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