如何将jsonarray反序列化为List< Map>在java中使用flexjson.deserializer？ [英] How to deserialize a jsonarray into a List<Map> in java using flexjson.deserializer?

问题描述

在客户端，我构建了一个像这样的JSOnARRAY：

In the client side, I have constructed a JSOnARRAY like this:

{"filterEntries":[{"dataName":"mainContact","filterValue":"BILLGATES"}]}.

在服务器端（java），我可以使用以下方法退出值：

On the server side (java), I can retireve the values using :

jfilter = JSONValue.parse(jsonFilterStr); //jsonFilterStr={"filterEntries":[{"dataName":"mainContact","filterValue":"BILLGATES"}]}.

JSONArray jFilterEntries = (JSONArray) jfilter.get("filterEntries");
for (int i=0;i<jFilterEntries.size();i++){
    JSONObject jFilterEntry = (JSONObject) jFilterEntries.get(i);
    String dataName = (String) jFilterEntry.get("dataName");
    String filterValue = (String) jFilterEntry.get("filterValue");
}

但是现有应用程序正在使用flex.json.deserializer而我无法使用flex.json.deserializer实现相同的功能。我该怎么办？
我希望这样做：

But the existing app is using flex.json.deserializer and I am unable to achieve the same using flex.json.deserializer. How should I proceed? I wish to do something like this:

JSONDeserializer jsonDeserializer = new JSONDeserializer();
jsonDeserializer.use(null, List.class);
List<Map<String,String>>    lMap= (List<Map<String,String>>)jsonDeserializer.deserialize(params);

推荐答案

记住包装数组的顶级对象。你也必须处理它。你必须告诉它期望列表中的Map。为此，您必须使用路径表达式values指定列表中包含的类型。

Remember the top object that wraps the array. You have to handle that as well. You have to tell it to expect a Map inside the List. To do that you have to specify the type contained in the list by using the path expression "values".

Map<String,List<Map<String,String>>> result = new JSONDeserializer<Map<String,List<Map<String,String>>>>()
    .use("values",List.class)
    .use("values.values", Map.class)
    .deserialize( json);

List<Map<String,String>> filterEntries = result.get("filterEntries");

更新：添加新关键字，并在右边匹配左边。

Updated: Add the new keyword, and made the generic types on the right match the left.

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