In this tutorial, we demonstrate to use Bean Shell Java interpreter as a cgi language.
Beanshell is a Java interpreter that can be called dynamically in Java applications or linux console. You can download and install Beanshell in Ubuntu using
# sudo apt-get install bsh
After installing you can test it by typing bsh in linux shell:
root@stdio:/# bsh
BeanShell 2.0b4 - by Pat Niemeyer (pat@pat.net)
bsh % System.out.println("Hello world!");
Hello world!
bsh % double[] d=new double[]{1,2,3.14159};
bsh % for (int i=0;i
System.out.println("d["+i+"] is "+d[i]);
}
d[0] is 1.0
d[1] is 2.0
d[2] is 3.14159
You have to create a file called .jline-bsh.Interpreter.history in directory /var/www and this file has to be writable rights. You can create and give writable rights like this:
# touch /var/www/.jline-bsh.Interpreter.history
# chmod a+w /var/www/.jline-bsh.Interpreter.history
Now we can create our Beanshell cgi script using a text editor like vim.
# cd /usr/lib/cgi-bin/
stdio:/usr/lib/cgi-bin# vim 1.bsh
A sample 1.bsh file includes these lines of codes:
#!/usr/bin/bsh
System.out.println("Content-type: text/html\n\n");
System.out.println("Hello from java cgi");
System.out.println(System.getenv("QUERY_STRING"));
In first line of this script, we say this script will be handled using /usr/bin/bsh.
Secondly, content type of this file is text/html so browser will display the output as html.
In third line, we send a hello world string to client and finally we write variables which are defined in URL.
In order to run this code, we have to give executable rights to file using
# chmod a+x 1.bsh
Now, we are ready to run this code using our browser. Be sure that your apache server is running using
# sudo /etc/init.d/apache2 status
and it is not running use
# sudo /etc/init.d/apache2 start
to start it. After that, open a browser and type,
http://localhost/cgi-bin/1.bsh
If everything is ok, we can see something like that:
We can pass some variables like this
http://localhost/cgi-bin/1.bsh?var1=3&var2=stdio&var3=aValue
