Evaluating javascript using a java code

Question

This might not be practical, but I have it as a task. I have an opened ServerSocket in java. Now I want to read a file which contains html and javascript, and output the jav

Answer 1

public static String convertEnumToJson(Class> cls) throws ScriptException, NoSuchMethodException, IllegalAccessException {
    List> map = createMap(Colors.class);
    return createJson(map);
}

public static List> createMap(Class> cls) throws IllegalAccessException {
    List> res = new ArrayList<>();

    for (Enum item : cls.getEnumConstants()) {
        Map map = new LinkedHashMap<>();

        for (Field field : item.getClass().getDeclaredFields()) {
            if (field.getType() != item.getClass() && !"$VALUES".equals(field.getName())) {
                field.setAccessible(true);
                map.put(field.getName(), field.get(item));
            }
        }

        res.add(map);
    }

    return res;
}

// It's better to use Jackson or similar lib for read/write json
public static  String createJson(T obj) throws ScriptException, NoSuchMethodException {
    ScriptEngineManager factory = new ScriptEngineManager();
    ScriptEngine engine = factory.getEngineByName("JavaScript");
    engine.eval("function sum(a){ return a;}");
    return ((Invocable)engine).invokeFunction("sum", obj).toString();
}