package com.lemon.lomboktest.utils;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
/**
 * @ Author     : AnxiangLemon
 * @ Date       : Created in 11:54 2018/9/4
 * @ Description: this is class
 */



/**
 * @author AnxiangLemon
 *  java调用直接调用js函数
 */
public class JsUtil {

    public static Integer getqrToken(String qrsig) {
        ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("javascript");
        String jsfun = "function  hash33(t) {" + "for (var e = 0, i = 0, n = t.length; n > i; ++i){"
                + "e += (e << 5) + t.charCodeAt (i);}" + "return 2147483647& e;	};";

        Integer scriptResult = 0;
        try {
            engine.eval(jsfun);
            Invocable invocable = (Invocable) engine;
            scriptResult = (Integer) invocable.invokeFunction("hash33", qrsig);
            System.out.println(scriptResult);
        } catch (ScriptException e) {
            System.out.println("Error executing script: " + e.getMessage() + " script:[" + jsfun + "]");
        } catch (NoSuchMethodException e) {
            System.out.println("Error executing script,未找到需要的方法: " + e.getMessage() + " script:[" + jsfun + "]");
            e.printStackTrace();
        }
        return scriptResult;
    }

}