Rhino (JavaScript Engine) - Example

Example

Below is an example of Java code running JavaScript print('Hello, world!')

import javax.script.ScriptEngine; import javax.script.ScriptEngineManager; import javax.script.ScriptException; public class RhinoEngine { public static void main(String args) { ScriptEngineManager mgr = new ScriptEngineManager; // Now we can go and get a script engine we want. // This can be done either by finding a factory that supports // our required scripting language // (engine = factory.getScriptEngine;) // or by requesting a script engine that supports a // given language by name from the script engine manager. ScriptEngine engine = mgr.getEngineByName("JavaScript"); // Now we have a script engine instance that // can execute some JavaScript try { engine.put("name", args); engine.eval("print('Hello ' + name + '!')"); } catch (ScriptException ex) { ex.printStackTrace; } } }

Here is a simple example showing a Rhino script that outputs each line in the stdin converted to uppercase.

// Equivalent in effect to the Java declaration import java.io.*; importPackage(java.io); importPackage(java.lang); // "in" is a keyword in JavaScript. // In JavaScript you could query for an attribute using syntax: var reader = new BufferedReader( new InputStreamReader(System) ); // We use JavaScript's dynamic typing here to let s be a boolean first, and later on a string... var s = true; while (s) { s = reader.readLine; if (s) { System.out.println(s.toUpperCase); } }