Java ScriptEngine supported languages

问题

Java has a ScriptEngine system that allows you to run/evaluate statements in a different language.
I know for a fact that JavaScript is supported, but I couldn't find any other languages to work with it.
Is, for example, Ruby implemented?

回答1:

..I know for a fact that JavaScript is supported,..

ECMAscript, technically.

.. but I couldn't find any other languages to work with it. Is, for example, Ruby implemented?

No. The ECMAscript engine is the only one included by default, the last time I heard.

Update

The comments of Pointy below, suggest that the Nashorn engine has been deprecated and will be removed 'soon'.

回答2:

Here is a script to determine all languages on your system:

import java.util.List;
import javax.script.ScriptEngineManager;
import javax.script.ScriptEngine;
import javax.script.Bindings;
import javax.script.ScriptContext;
import javax.script.ScriptEngineFactory;


public class Test {

public static void main(String[] args)
{
    ScriptEngineManager mgr = new ScriptEngineManager();
    List<ScriptEngineFactory> factories = mgr.getEngineFactories();
    for (ScriptEngineFactory factory : factories)
    {
        System.out.println("ScriptEngineFactory Info");
        String engName = factory.getEngineName();
        String engVersion = factory.getEngineVersion();
        String langName = factory.getLanguageName();
        String langVersion = factory.getLanguageVersion();
        System.out.printf("\tScript Engine: %s (%s)\n", engName, engVersion);
        List<String> engNames = factory.getNames();
        for (String name : engNames)
        {
            System.out.printf("\tEngine Alias: %s\n", name);
        }
        System.out.printf("\tLanguage: %s (%s)\n", langName, langVersion);
        }
    }

}

Hope this helps.

回答3:

Not in ScriptEngine, but you can still use BSF. From the Apache Commons Bean Scripting Framework, you can find it's Documentation here. -

BSF 2.x supports several scripting languages currently:

Javascript (using Rhino ECMAScript, from the Mozilla project)
NetRexx (an extension of the IBM REXX scripting language in Java)
Commons JEXL
Python (using Jython)
Tcl (using Jacl)
XSLT Stylesheets (as a component of Apache XML project's Xalan and Xerces)

In addition, the following languages are supported with their own BSF engines:

Java (using BeanShell, from the BeanShell project)
Groovy
Groovy Monkey
JLog (PROLOG implemented in Java)
JRuby
JudoScript
ObjectScript
ooRexx (Open Object Rexx), using BSF4ooRexx.

回答4:

There are several other languages available. For instance, Jython (Python implementation in Java). The way to use other languages is by adding the JAR file to CLASSPATH and making a reference to the right name.

For Ruby, there is JRuby. See the following: https://github.com/jruby/jruby/wiki/JavaIntegration

ScriptEngineManager m = new ScriptEngineManager();
ScriptEngine rubyEngine = m.getEngineByName("jruby");

回答5:

The Java ScriptEngine API will work with all JSR-223 Scripting Languages. I haven't found a well documented complete list of these before but this post does a pretty good job, Where can I find a list of available JSR-223 scripting languages? Here is one list from that post,

JSR-223 script engines

AWK
BeanShell
ejs
FreeMarker
Groovy
Jaskell
Java
JavaScript
JavaScript (Web Browser)
Jelly
JEP
Jexl
jst
JudoScript
JUEL
OGNL
Pnuts
Python
Ruby
Scheme
Sleep
Tcl
Velocity
XPath
XSLT

JSR 223 script engines maintained elsewhere

JavaFX Script
ABCL
AppleScript
Bex script
OCaml Scripting Project
PHP
PHP (another one)
Python
Smalltalk
CajuScript
MathEclipse

Most have a special implementation for it to work. For example python alone will not work you need the Jython jar added to the class path. Same for Ruby you'll need JRuby.

来源：https://stackoverflow.com/questions/20013310/java-scriptengine-supported-languages

标签

java

built-in

scriptengine