java - 读取Nashorn JO4和NativeArray

Java调用代码:

import jdk.nashorn.api.scripting.*;
....
myCustomHashMap dataStore = new myCustomHashMap();
ScriptEngineManager sem = new ScriptEngineManager();
ScriptEngine engine = sem.getEngineByName("nashorn");
engine.put("dataStore",dataStore);
engine.eval(new java.io.FileReader("test.js"));
((Invocable)engine).invokeFunction("jsTestFunc", "testStr" );

Javascript:

function jsTestFunc (testParam)
  { dataStore.a = [1,2,3];
    dataStore.b = {First:"John",Last:"Doe",age:37}; }

目标:

I need to JSONify the dataStore after the script execution
with no dependence on the script for assistance

dataStore.a -> jdk.nashorn.internal.objects.NativeArray
dataStore.b -> jdk.nashorn.internal.scripts.JO4

对于每个Map值，我都尝试并失败了:

转换为ScriptObject或ScriptObjectMirror

转换到 map 或列表

直接访问JO4/NativeArray方法

ScriptUtils.wrap()/ScriptUtils.unwrap()

我尝试覆盖HashMap.put()方法，但似乎仅在显式函数调用上不会将其转换为赋值的ScriptObjectMirror:

dataStore.x = [1,2,3] ; -> jdk.nashorn.internal.objects.NativeArray

javaHost.javaFunc( [1,2,3] ); -> ScriptObjectMirror

我真的需要使用myCustomHashMap(它的时间戳更改并维护更改列表等)，所以我不能从根本上改变这种安排。我该怎么做才能取回这些数据？

最佳答案

这是一个错误。



https://wiki.openjdk.java.net/display/Nashorn/Nashorn+jsr223+engine+notes

与JDK8u40抢先体验版

Java的:

public class MyObject extends HashMap<String, Object> {
    @Override
    public Object put(String key, Object value) {
        System.out.println("Key: " + key + " Value: " + value + " Class: " + value.getClass());
        return super.put(key, value);
    }
}

JavaScript:

var MyObject = Java.type("my.app.MyObject");
var test = new MyObject;
test.object = {Test : "Object"};
test.array = [1,2,3];

安慰:

Key: object Value: [object Object] Class: class jdk.nashorn.api.scripting.ScriptObjectMirror
Key: array Value: [object Array] Class: class jdk.nashorn.api.scripting.ScriptObjectMirror

关于java - 读取Nashorn JO4和NativeArray，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/26392602/