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RhinoExportVar.java - Exporting Rhino Variable to Java
How to export variable from Rhino JavaScript context to a Java object?
✍: FYIcenter
If you want to export variable from Rhino JavaScript context to a Java object, you can follow this tutorial:
1. Create a Context object and Scriptable scope object with an instance of ContextFactory:
ContextFactory f = new ContextFactory(); Context c = f.enterContext(); Scriptable s = c.initStandardObjects();
2. Run the JavaScript code to set the JavaScript variable, str:
String js = "var str = 'Hello world!'"; c.evaluateString(s, js, null, 1, null);
3. Call get() method on the Scriptable scope object to export the variable, str, to a Java object, jsObj:
Object jsObj = s.get("str", s);
4. Call Context.toString() method to cast the Java object a string:
System.out.println(Context.toString(jsObj));
Here is the entire example program, RhinoSystemOut, that maps System.out from Java as varOut in JavaScript:
// Copyright (c) 2017 FYIcenter.com import org.mozilla.javascript.ContextFactory; import org.mozilla.javascript.Context; import org.mozilla.javascript.Scriptable; public class RhinoExportVar { public static void main(String[] args) throws Exception { ContextFactory f = new ContextFactory(); Context c = f.enterContext(); Scriptable s = c.initStandardObjects(); String js = "var str = 'Hello world!'"; c.evaluateString(s, js, null, 1, null); Object jsObj = s.get("str", s); System.out.println(Context.toString(jsObj)); } }
Compile and run the example program, RhinoExportVar.java:
>\fyicenter\jdk-1.8.0\bin\javac -cp \fyicenter\rhino1_7R5\js.jar RhinoExportVar.java >\fyicenter\jdk-1.8.0\bin\java -cp .;\fyicenter\rhino1_7R5\js.jar RhinoExportVar Hello world!
⇒ RhinoPoundToKilo.java - Exchange Data with Rhino Variables
⇐ RhinoSystemOut.java - Mapping Java Object to Rhino
2017-08-08, 2268🔥, 0💬
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