java中调用js脚本(函数)执行

最近项目开发中用到了java调用js脚本的需求,在此做一下记录:下面为kotlin代码

 val manager = ScriptEngineManager()
        val engine = manager.getEngineByName("javascript")
        try {
            engine.eval("function transform(variable){\n" +
                    "if(variable == '4'){\n" +
                    "    return true;\n" +
                    "}else {\n" +
                    "    return false\n" +
                    "  }\n" +
                    "}")
            if (engine is Invocable) {
                val `in` = engine as Invocable

                if (`in`.invokeFunction("transform", "20") as Boolean){
                    System.out.println("有")
                }else{
                    System.out.println("没有")
                }

            }
        } catch (e: Exception) {
            e.printStackTrace()
        }

java 代码如下:

ScriptEngineManager manager = new ScriptEngineManager();
        ScriptEngine engine = manager.getEngineByName("javascript");
        try{
            engine.eval("function transform(variable){\n" +
                    "if(variable == '4'){\n" +
                    "    return true;\n" +
                    "}else {\n" +
                    "    return false\n" +
                    "  }\n" +
                    "}");
            if (engine instanceof Invocable) {
                Invocable in = (Invocable) engine;
                System.out.println(in.invokeFunction("add",1,1));
            }
            }catch(Exception e){
            e.printStackTrace();
        }
    }

读取文件的稍后也记录一下…