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RhinoFunctionCall.java - Call JavaScript Function from Java
How to call an JavaScript function from my Java code? I have Rhino 1.7R5 installed.
✍: FYIcenter
If you want to call an JavaScript function from my Java code, 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. Create a JavaScript code to define your function and get it evaluated:
String js = "function p2k(p) {\n"; js += " return p*0.453592;\n"; js += "}\n"; c.evaluateString(s, js, null, 1, null);
3. Export the function from JavaScript to Java like any data object:
Object jsF = ScriptableObject.getProperty(s, "p2k"); Function p2k = (Function) Context.jsToJava(jsF, Function.class);
4. Call the call() on the org.mozilla.javascript.Function object. Then convert its returning object to the proper value:
Object jsR = p2k.call(c, s, s, args); Double kilo = (Double) Context.jsToJava(jsR, Double.class);
Here is the entire example program, RhinoFunctionCall, that shows how to define a function in JavaScript and run it from Java:
// 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; import org.mozilla.javascript.Function; public class RhinoFunctionCall { public static void main(String[] args) throws Exception { ContextFactory f = new ContextFactory(); Context c = f.enterContext(); Scriptable s = c.initStandardObjects(); String js = "function p2k(p) {\n"; js += " return p*0.453592;\n"; js += "}\n"; c.evaluateString(s, js, null, 1, null); Object jsF = ScriptableObject.getProperty(s, "p2k"); Function p2k = (Function) Context.jsToJava(jsF, Function.class); Object jsR = p2k.call(c, s, s, args); Double kilo = (Double) Context.jsToJava(jsR, Double.class); System.out.println("Pound to Kilo conversion:"); System.out.println(" Pound = "+args[0]); System.out.println(" Kilo = "+kilo); System.out.println("JavaScript used:"); System.out.println(js); } }
Compile and run the example program, RhinoFunctionCall.java:
>\fyicenter\jdk-1.8.0\bin\javac -cp \fyicenter\rhino1_7R5\js.jar RhinoFunctionCall.java >\fyicenter\jdk-1.8.0\bin\java -cp .;\fyicenter\rhino1_7R5\js.jar RhinoFunctionCall 6.0 Pound to Kilo conversion: Pound = 6.0 Kilo = 2.721552 JavaScript used: function p2k(p) { return p*0.453592; }
⇒ RhinoJsFile.java - Running JavaScript Code from File
⇐ RhinoPoundToKilo.java - Exchange Data with Rhino Variables
2017-08-08, 2312🔥, 0💬
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