Program/ Example of Nashorn Javascript (js) Engine in Java 8 - Call/Invoke js (javascript) function - Find sum of numbers using js squareFunction >
package nashorn1;
import java.io.FileNotFoundException;
import java.io.FileReader;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
public class Nashorn_sumOfNumbersInJavascriptFunction {
public static void main(String[] args) throws Exception {
System.out.println("In java - START");
// Get nashorn engine
ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
// Pass the location of js file
engine.eval(new FileReader("E:/pocJmse/myNashornJavaScript.js"));
// NashornScriptEngine implements Invocable interface
Invocable invocable = (Invocable) engine;
// Call/Invoke js (javascript) function - Find sum of numbers using js squareFunction
System.out.println("In java - Call js (javascript) sumFunction to - Find sum of numbers");
Object sumResult = invocable.invokeFunction("sumFunction", 2, 3);
System.out.println("In java - sumResult = " + sumResult);
System.out.println("In java - sumResult type = " + sumResult.getClass());
System.out.println("In java - FINISH");
}
}
/* OUTPUT
In java - START
In myNashornJavaScript.js
End myNashornJavaScript.js
In java - Call js (javascript) sumFunction to - Find sum of numbers
In js function - Calulating sum of 2 and 3
In java - sumResult = 5
In java - sumResult type = class java.lang.Integer
In java - FINISH
*/
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E:/pocJmse/myNashornJavaScript.js looks like this >
print('In myNashornJavaScript.js');
var sumFunction = function(num1, num2) {
print('In js function - Calulating sum of ' + num1 + ' and ' + num2);
return (num1 + num2);
};
print('End myNashornJavaScript.js');
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