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RhinoSystemOut.java - Mapping Java Object to Rhino
How to map "System.out" object to Rhino JavaScript context, so I can use it in my JavaScript code?
✍: FYIcenter
If you want to map "System.out" object or any other objects to Rhino JavaScript context, 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. Call Context.javaToJS() method to wrap the System.out Java object or any object to a Rhino object, jsOut:
Object jsOut = Context.javaToJS(System.out, s);
3. Call ScriptableObject.putProperty() method to set the Rhino object as a variable, varOut, into the Rhino Scriptable scope object:
ScriptableObject.putProperty(s, "varOut", jsOut);
4. Use the variable, varOut, anywhere in your JavaScript code:
String js = "varOut.println('Hello world!')"; c.evaluateString(s, js, null, 1, null);
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; import org.mozilla.javascript.ScriptableObject; public class RhinoSystemOut { public static void main(String[] args) throws Exception { ContextFactory f = new ContextFactory(); Context c = f.enterContext(); Scriptable s = c.initStandardObjects(); Object jsOut = Context.javaToJS(System.out, s); ScriptableObject.putProperty(s, "varOut", jsOut); String js = "varOut.println('Hello world!')"; c.evaluateString(s, js, null, 1, null); } }
Compile and run the example program, RhinoSystemOut.java:
>\fyicenter\jdk-1.8.0\bin\javac -cp \fyicenter\rhino1_7R5\js.jar RhinoSystemOut.java >\fyicenter\jdk-1.8.0\bin\java -cp .;\fyicenter\rhino1_7R5\js.jar RhinoSystemOut Hello world!
⇒ RhinoExportVar.java - Exporting Rhino Variable to Java
⇐ RhinoHello.java - Rhino JavaScript Hello Example
2017-08-13, 2197🔥, 0💬
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