package com.lf.server.helper;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

/**
 * JS帮助类
 *
 * @author WWW
 * @date 2024-02-29
 */
public class JsHelper {
    private final static Log log = LogFactory.getLog(JsHelper.class);

    /**
     * 调用JS方法
     */
    public Object callJsFn() {
        try {
            // 创建 JavaScript 引擎管理器
            ScriptEngineManager manager = new ScriptEngineManager();
            // 获取 JavaScript 引擎
            ScriptEngine engine = manager.getEngineByName("javascript");

            // 定义要执行的 JavaScript 脚本
            String script = "function addNumbers(a, b){ return a + b; }";

            // 编译并运行 JavaScript 脚本
            engine.eval(script);

            // 调用 JavaScript 函数
            Invocable invocable = (Invocable) engine;
            Object obj = invocable.invokeFunction("addNumbers", 2, 3);

            return obj;
        } catch (Exception ex) {
            log.error(ex.getMessage(), ex);
            return null;
        }
    }
}