Java-Buddy

This example show how to call Java javaStaticMethod() in "javatestnashornjavascript.JavaTestNashornJavascript" class.

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 String javaStaticMethod(String para){
 System.out.println("javaStaticMethod("+para+") called");
 String rev = new StringBuilder(para).reverse().toString();
 return rev;
 };
 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);
 
 var myClass = Java.type("javatestnashornjavascript.JavaTestNashornJavascript");
 var revPara = myClass.javaStaticMethod(para);
 
 return "Hello " + revPara;
};

Post a Comment

[フレーム]