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Check for swing and download it without any user activity

Hi Experts,

I made an applet using some swing classes. I want to include a code that checks whether swing installed on machine where applet is running. If swing not installed, how can I download and install it invisibly (I mean without any user activity) so my applet can run normally? Please provide source code.

Thanks in advance
Stanislav
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spokraev
Asked:
spokraev
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1 Solution
 
sailwindCommented:
The way you would do this is by using Java Plugin. Unfortunately,
there is no way to do it invisibly. For IE users, they can simply
click on the applet, and the active desktop will download/install
and run it right away. However, for netscape users, they will
have to click on the applet, click okay to save the plugin file,
run the plugin, and restart netscape. There is simply no other
way to do this, and the plugin has already simplified the
process by quite a bit.

The site is:
http://www.java.sun.com/products/plugin/

Please look at this site for the exact html syntax.

Here's what my html code for the plugin looked like:

<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"

        width="120" height="160" align="left"



codebase="http://java.sun.com/products/plugin/1.1/

jinstall-11-win32.cab

#Version=1,1,0,0">



<PARAM NAME="code" VALUE="Your_Applet_Class.class">

<PARAM NAME="type" VALUE="application/x-java-applet;version=1.1">

<PARAM NAME="model" VALUE="models/HyaluronicAcid.xyz">





<COMMENT>

        <EMBED type="application/x-java-applet;version=1.1"

                width="120" height="160" left

                code="Your_Applet_Class.class"

pluginspage="http://wwwin-people.cisco.com//tolin/plugin-111-win32.exe">

        <NOEMBED>

</COMMENT>

        No support for JDK 1.1 applets found!

        </NOEMBED>

        </EMBED>

 </OBJECT>    
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diakovCommented:
You can as well provide the Swing along with your code (swingall.jar in the archives tag of the HTML)

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spokraevAuthor Commented:
I had difficulties with sailwind's solution. Couldn't make it work. Diakov's suggestion worked and actually it satisfies me.

Anyway thanks for your quick response.

Diakov please post your comment as answer.
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diakovCommented:
Thanx.
<lock>
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sailwindCommented:
Hmm.. never thought about that possibility. Few questions:

1) Would the jar be downloaded immediately and allow the applet
   to run right away?

2) Does this implementation work on all platforms and both
   browsers?

3) is the swingall.jar smaller than the plugin?

Thanks for the explanations
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diakovCommented:
As far as I know, swingall.jar is about 2M. The ARCHIVE entry of the applet tag works on all browser. The idea is to put your code into one jar, while keeping all libraries into their original jars. Yes, it gets downloaded frist thing during initialization.

Cheers,
  Nik
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sailwindCommented:
I guess the benefit of the java plugin over this implementation
would be that you will not need to download the 2M archive
every time the user runs the applet. The plugin will register
itself with the browser and be called locally every time it
loads a swing applet.

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diakovCommented:
I have to check this, but I think that the class loader first check the local classpath (of the browser) and then the archive tag).
Another benefit of the plugin is that it enables 1.0 browsers to be 1.1 and even 1.2 compliant.
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