Java-Buddy

Example to call function and get result in Javascript, from Java code:

JavaTestNashornJavascript.java

package javatestnashornjavascript;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.net.URISyntaxException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaTestNashornJavascript {
 
 final String myJavascript = "<path to myjavascript.js>";
 
 JavaTestNashornJavascript(){
 ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
 ScriptEngine nashorn = scriptEngineManager.getEngineByName("nashorn");
 try {
 FileReader fileReader = new FileReader(myJavascript);
 nashorn.eval(fileReader);
 Invocable invocable = (Invocable) nashorn;
 Object jsResult = invocable.invokeFunction(
 "javascriptFunction", "Java-Buddy");
 System.out.println("result returned to Java from JavaScript: " + jsResult);
 } catch (FileNotFoundException 
 | ScriptException 
 | NoSuchMethodException ex) {
 Logger.getLogger(JavaTestNashornJavascript
 .class.getName()).log(Level.SEVERE, null, ex);
 }
 }
 public static void main(String[] args) throws URISyntaxException {
 
 JavaTestNashornJavascript javaTestNashornJavascript = 
 new JavaTestNashornJavascript();
 }
}

myjavascript.js

var javascriptFunction = function(para){
 print("para passed from Java to JavaScript: " + para);
 return "Hello " + para;
}

more nashorn JavaScript exercise:

• Call Java method from JavaScript

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