RE: [Jython-users] [Q] newbie's question on Jython

[Alan L. <al...@li...>]

In addition to the use of interp.exec(), interp.eval() can be used to return
values back to the Java side -- however you'll have to dig around a bit in
the API docs for PyObject, PyInstance, PyTuple etc to learn how to get the
underlying Java object out of the returned, wrapped, data. I've got Jython
running a Java-based web server whose servlets (JSP) call into Jython to do
dynamic evaluation of elements in a database which return Python objects to
the servlets which then strip out the Java goodies to generate pages --- all
works crisply and reliably.

Alanl


-----Original Message-----
From: jyt...@li...
[mailto:jyt...@li...]On Behalf Of Robert W.
Bill
Sent: Tuesday, August 21, 2001 9:53 AM
To: Young-Jin Lee
Cc: jyt...@li...
Subject: Re: [Jython-users] [Q] newbie's question on Jython


On Tue, 21 Aug 2001, Young-Jin Lee wrote:
> Hi, all.
> I have a question on the imbedded Jython. It seems like that a Java
> application can use a Jython as an interpreter module, but I'm not sure
> what kind of things can be done with the imbedded Jython.

Anything you can do in Jython can be done with the embedded interpreter.

> For example,
> can a Java application call a user-defined Python method through a
> Jython interpreter?

Yes, with ease.

> If it cannot be done, is there any other way to do
> this?

Using the embedded interpreter is best.

> I need a Java interpreter module....

Here's an example...

import java.util.Properties;
import org.python.util.PythonInterpreter;

public class embeddingExample {

    protected PythonInterpreter interp;

    public static void main(String[] args) {
        embeddingExample embed = new Embedding();
        embed.startInterp();
        embed.test();
    }

    protected void startInterp() {
        Properties props = new Properties();

        if (System.getProperty("python.home") == null)
            props.put("python.home", "/usr/local/jython");

        PythonInterpreter.initialize(preProps, postProps, argv);
        interp = new PythonInterpreter();
    }

    public void useInterp() {
        // define and call a Jython function
        interp.exec("def test(message):\n" +
                    "    print message");
        interp.exec("test('Hello world')");

        // you can import Python modules as use them just as easily
        interp.exec("import glob\n" +
                    "print glob.glob('*')");

    }
}



Enjoy,
Robert


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