How to run java.class applet in browser on localhost
I don't know anything about Java at all and I just need to run the applet in the browser at localhost.
I only download the file .class
from the following website
http://isgwww.cs.uni-magdeburg.de/tspanner/TSpanner.html
and I need to run this file .class
on my localhost.
I have tried every solution given in the Java applet Error ... What's wrong? but I was unable to start it.
This is my HTML code
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head>
<title>Visualization of Spanners - The Applet</title>
</head>
<body alink="#990099" bgcolor="#cccccc" link="#000099" vlink="#000099">
<applet code="gsn.TSpanner" align="BOTTOM" height="480" width="720"></applet>
</body></html>
In the directory where this one resides .html
, I created a folder and renamed it to gsn
and copied the TSpanner.class
file there, after navigating to the url of the file .html
. Java throws the following error
NoClassDefFoundError
gsn / TSpanner (handwritten name: TSpanner)
I also tried to copy the file .class
to the root directory and install
<applet code="TSpanner.class" align="BOTTOM" height="480" width="720"></applet>
It didn't work again.
Can I run this one .class
on localhost? There are no more files (for example .jar
) and if so, how?
Thank.
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I was able to run this applet using the command line tool appletviewer
that comes with the JDK. The tool appletviewer
expects you to send it an HTML page containing the tag <applet>
, so I created the following layout page for this purpose:
<HTML>
<HEAD><TITLE>Test Page</TITLE></HEAD>
<BODY>
<APPLET code="TSpanner.class" align="BOTTOM" height="480" width="720"></applet>
</BODY>
</HTML>
Save this HTML page in a directory somewhere and name it test.html
. You will use this later with a tool appletviewer
.
The trick for running it was to load all the class files it depends on TSpanner.class
. This meant loading the following 5 class files:
- TSpanner $ AnimateThread.class
- Path.class
- Sheet.class
- Point.class
- PointVector.class
I downloaded these files from my browser by typing a URL that Java itself will use, running from your browser, to get the files I need. Here's an example URL that I used to download the file Point.class
:
http://isgwww.cs.uni-magdeburg.de/tspanner/Point.class
Do this for each of the five required class files (by simply changing the class file name at the end of the above url) and store them in a directory at the same level as the page test.html
you created above.
Finally, you can start Java appletviewer
from the command line. Change directories in bin
your Java installation directory and do the following:
C:\Program Files\Java\jdk1.7.0_80\bin\appletviewer.exe test.html
Once it starts, you will see the applet running in its own window. Here is a screen capture of what it looks like on my machine:
You can try to run this applet in your Firefox browser, but if you don't plan on hosting it on your own web page, there appletviewer
is probably an easier way. As you've probably figured out, most browsers drop support for the tag <applet>
at this point.
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