Let us say your jsfunctions.js file has a function "display" and this file is stored in C:/Scripts/Jsfunctions.js
jsfunctions.js
var display = function(name) {
print("Hello, I am a Javascript display function",name);
return "display function return"
}
Now, in your java code, I would recommend you to use Java8 Nashorn. In your java class,
import java.io.FileNotFoundException;
import java.io.FileReader;
import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
class Test {
public void runDisplay() {
ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");
try {
engine.eval(new FileReader("C:/Scripts/Jsfunctions.js"));
Invocable invocable = (Invocable) engine;
Object result;
result = invocable.invokeFunction("display", helloWorld);
System.out.println(result);
System.out.println(result.getClass());
} catch (FileNotFoundException | NoSuchMethodException | ScriptException e) {
e.printStackTrace();
}
}
}
Note: Get the absolute path of your javascript file and replace in FileReader() and run the java code. It should work.