Example - Jeval - multi user GUI
This is a simple example of communication between Java and Prolog where
Prolog is the server and a Java applet is client. In this example multiple
applets can access the same Prolog application.
Instructions
1. Change directory to examples/jeval/ and start the example with
sicstus -l multi_eval
Normally the server will listen for http at port 30002.
2. Browse to http://localhost:30002/
Each time a browser access the server it will send a page with a Java applet.
The applet then "logs-in" to the server and request the application dependent
Java code (BeanShell scripted). In this example it is the application dependent
code describes a GUI:
jeval:jeval(User, '\c
jevalApplet.setLayout(new GridLayout(0,1));\c
jevalApplet.add(new Label("Enter expression"));\c
expr = new TextField("5 * 7");\c
jevalApplet.add(expr);\c
result = new Label("Result:");\c
jevalApplet.add(result);\c
button = new Button("Evaluate!");\c
jevalApplet.add(button);\c
jeval.addActionListener("button");\c
jeval.addActionListener("expr");\c
jevalApplet.validate();\c
jevalApplet.repaint();').
When you have successfully started the multi_eval example and browsed to
the server you will see a small applet looking like the screenshot below.
Source Code
The code of the Jeval example
multi_eval.pl.
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