如何在Nashorn CompiledScript中调用一个方法

How do you invoke a method in a Nashorn CompiledScript?

本文关键字：一个 方法 调用 Nashorn CompiledScript      更新时间：2023-09-26

我有下面的代码工作:

ScriptEngine jsEngine = ScriptEngineManager.new().getEngineByName("nashorn");
jsEngine.eval("some script");
jsEngine.invokeMethod(jsEngine.eval("foo"), "bar");

但是我想使用预编译的脚本，这样我就不必每次需要运行脚本时都对脚本进行评估，所以我正在尝试;

ScriptEngine jsEngine = ScriptEngineManager.new().getEngineByName("nashorn");
CompiledScript compiledJS = jsEngine.compile("some script");

但我不知道该怎么做与CompiledScript，我如何调用一个方法?它没有实现eval()以外的任何东西:https://docs.oracle.com/javase/8/docs/api/javax/script/CompiledScript.html

你调用了这个方法?

下面是几个例子:http://www.programcreek.com/java-api-examples/index.php?api=javax.script.CompiledScript

的例子:

import java.util.*;
import javax.script.*;
public class TestBindings {
    public static void main(String args[]) throws Exception {
        String script = "function doSomething() {var d = date}";
        ScriptEngine engine =  new ScriptEngineManager().getEngineByName("JavaScript");
        Compilable compilingEngine = (Compilable) engine;
        CompiledScript cscript = compilingEngine.compile(script);
        //Bindings bindings = cscript.getEngine().createBindings();
        Bindings bindings = engine.getBindings(ScriptContext.ENGINE_SCOPE);
        for(Map.Entry me : bindings.entrySet()) {
            System.out.printf("%s: %s'n",me.getKey(),String.valueOf(me.getValue()));
        }
        bindings.put("date", new Date());
        //cscript.eval();
        cscript.eval(bindings);
        Invocable invocable = (Invocable) cscript.getEngine();
        invocable.invokeFunction("doSomething");
    }
}

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