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up vote 13 down vote favorite
9

By using Java Sripting API, I am able to execute JavaScript within Java. However, can someone please explain what I would need to add to this code for being able to call on functions that are in C:/Scripts/Jsfunctions.js

import javax.script.*;

public class InvokeScriptFunction {
public static void main(String[] args) throws Exception {
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("JavaScript");

    // JavaScript code in a String
    String script1 = (String)"function hello(name) {print ('Hello, ' + name);}";
    String script2 = (String)"function getValue(a,b) { if (a==="Number") return 1; 
                     else return b;}";
    // evaluate script
    engine.eval(script1);
    engine.eval(script2);

    Invocable inv = (Invocable) engine;

    inv.invokeFunction("hello", "Scripting!!" );  //This one works.      
 }
}
share|improve this question
up vote 17 down vote accepted

Use ScriptEngine.eval(java.io.Reader) to read the script

ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
// read script file
engine.eval(Files.newBufferedReader(Paths.get("C:/Scripts/Jsfunctions.js"), StandardCharsets.UTF_8));

Invocable inv = (Invocable) engine;
// call function from script file
inv.invokeFunction("yourFunction", "param");
share|improve this answer
    
Thanks a lot mate – MRK187 Apr 4 '14 at 7:52
    
Yes, it's useful, thanks. How can we use Window in the provided javascript since through java code there will be no browser for this. – sandeep kale Feb 6 at 17:23
    
Which window or browser are you referring to? – MRK187 May 13 at 14:02
    
Thanks, my problem is solved.... :) – Hassan Aug 5 at 6:21
1  
In case difficulties in loading relative path use below code. URL fileUrl = getClass().getResource("js/WebWorker.js"); engine.eval(Files.newBufferedReader(Paths.get(fileUrl.toURI()),StandardCharsets.‌​UTF_8)); – Mano Oct 28 at 9:08

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