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我正在尝试根据自己的需要测试 ScriptEngine。在我的 Java 程序中，我有一个变量：

HashMap<String,HashMap<String,String[]>> mymap = new HashMap<String,HashMap<String,String[]>>();

例如，它包含{Source, {service = ["TCP"]}} 现在，我希望能够将此映射传递给 ScriptEngine，以便在读取我的映射内容时评估表达式。我尝试执行以下操作：

HashMap<String,String[]> Source = new HashMap<String,String[]>();
Source.put("service", new String[]{"TCP"});
mymap.put("Source", Source);
ScriptEngineManager factory = new ScriptEngineManager();
ScriptEngine engine = factory.getEngineByName("JavaScript");
Bindings bindings = new SimpleBindings();
bindings.put("map", mymap);
String exp = "println(\"Hello from inside scripting!\");"
                + "println(\"map = \" + map)";
engine.eval(exp,bindings);

然而它不起作用。我得到：

Hello from inside scripting!
mymap = {Source={service=[Ljava.lang.String;@4e2e29c}}

我都试过了，map.Source or map['Source']但它们都没有奏效。我如何让它工作？这样字符串就可以通过并评估它？更重要的是，因为它可以解决我的任何问题，我可以调试 javascript 运行时吗？所以我可以看到那里发生了什么。

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1 回答 1

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I managed to solve this by realizing from other examples, that the syntax inside the evaluation string should be the syntax of a Java application, therefore, as a map, I did:

map.get('Source').get('service')

The first .get() returns the value of the map Source key, then the second .get() returns the value of service. I really wonder what is the performance of that type of evaluation process. and moreover, if its possible to debug it?

于 2013-10-30T12:16:49.740 回答