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JavaScriptRhinoEngine.java - Select SJP RI Engine: Rhino
How to select the SJP Reference Implementation Script Engine, Mozilla Rhino, to run my JavaScript code? I don't want to use the default JavaScript engine.
✍: FYIcenter
If you have the SJP Reference Implementation Script Engine, sjp-1_0-fr-ri.zip, installed, you select it to run your JavaScript code instead of using the default script engine, Oracle Nashorn.
1. Make sure 2 JAR files from the SJP Reference Implementation package, sjp-1_0-fr-ri.zip, are installed properly:
>dir \fyicenter\sjp-1_0-fr-ri 07/27/2006 01:09 PM 701,049 js.jar 10/16/2006 07:00 PM 34,607 script-js.jar
2. Get all available script engine factories:
ScriptEngineManager m = new ScriptEngineManager(); List<ScriptEngineFactory> l = m.getEngineFactories();
3. Loop through the factory list, and select "Mozilla Rhino" engine:
ScriptEngineFactory f = null; for (ScriptEngineFactory i : l) { if (i.getEngineName().equals("Mozilla Rhino")) { f = i; break; } }
Here is the entire example program, JavaScriptRhinoEngine.java, that shows you how to select a specific script engine to run script code:
// Copyright (c) 2017 FYIcenter.com import javax.script.ScriptEngineManager; import javax.script.ScriptEngine; import javax.script.ScriptEngineFactory; import java.util.*; public class JavaScriptRhinoEngine { public static void main(String[] args) throws Exception { ScriptEngineManager m = new ScriptEngineManager(); List<ScriptEngineFactory> l = m.getEngineFactories(); ScriptEngineFactory f = null; System.out.println("\nScript Engines:"); for (ScriptEngineFactory i : l) { System.out.println(" Engine name: "+i.getEngineName()); if (i.getEngineName().equals("Mozilla Rhino")) { System.out.println(" Selected..."); f = i; break; } } ScriptEngine e = f.getScriptEngine(); System.out.println("\nFrom Mozilla Rhino:"); e.eval("print(' Hello world!')"); System.out.println("\nJavaScript engine info:"); System.out.println(" Engine name: "+f.getEngineName()); System.out.println(" Engine version: "+f.getEngineVersion()); System.out.println(" Language name: "+f.getLanguageName()); System.out.println(" Language version: "+f.getLanguageVersion()); System.out.println(" Engine class: "+e.getClass().getName()); System.out.println(" Factory class: "+f.getClass().getName()); System.out.println(" Manager class: "+m.getClass().getName()); } }
Compile and run the example program, JavaScriptRhinoEngine.java, with two JAR files from sjp-1_0-fr-ri.zip:
>\fyicenter\jdk-1.8.0\bin\javac JavaScriptRhinoEngine.java >\fyicenter\jdk-1.8.0\bin\java -cp .;\fyicenter\sjp-1_0-fr-ri\script-js.jar;\fyicenter\sjp-1_0-fr-ri\js.jar JavaScriptRhinoEngine Script Engines: Engine name: Oracle Nashorn Engine name: Mozilla Rhino Selected... From Mozilla Rhino: Hello world! JavaScript engine info: Engine name: Mozilla Rhino Engine version: 1.6 release 2 Language name: ECMAScript Language version: 1.6 Engine class: com.sun.script.javascript.RhinoScriptEngine Factory class: com.sun.script.javascript.RhinoScriptEngineFactory Manager class: javax.script.ScriptEngineManager
⇒ Download Rhino to SJP Wrapper rhino-js-engine-1.7.7.1.jar
⇐ JavaScriptEngineList.java - Load SJP Reference Implementation
2017-07-21, 1656🔥, 0💬
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