如何从JSON列表的JSON列表中获取数据 [英] How to get the data from the JSON list of JSON list

问题描述

我从我的API中获得了一个JSON字符串，如下所示:

I've got an JSON string from my API, looks like this:

[
    {
        "id": "abc",
        "data": {
            "Name": "Peter",
            "Date": "2017/12/01"

        }
    },
    {
        "id": "def",
        "data": {
            "Name": "Tina",
            "Date": "2017/12/20"
        }

    },
    {
        "id": "ghi",
        "data": {
            "Name": "Amy",
            "Date": "2017/12/16"
        }

    }
]

然后，我使用(java):

Then, I use (java):

Gson gson = new Gson();
Type resultType = new TypeToken<List<Map<String, Object>>>() {
            }.getType();
List<Map<String, Object>> result = gson.fromJson(info, resultType); 

如果我调用result.get(0).toString());然后它返回:

if I call result.get(0).toString()); then it returned:

{id=abc, data={Name=Peter, Date=2017/12/01}}

如果我调用result.get(0).get("id").toString();然后它返回

if I call result.get(0).get("id").toString(); then it returned

abc

现在，当我调用result.get(0).get("data").toString();时，我想获取"data"的数据.然后它返回了

Now I want to get the data of "data", when I call result.get(0).get("data").toString(); then it returned

{Name=Peter, Date=2017/12/01}

最后，我想获取名称"信息，但是当我尝试将此字符串转换为Map时，这会导致一些问题，代码如下:

Finally I want to get the "Name" info, but when I tried to convert this string to Map, it cause some problem, the code is like this:

Type type = new TypeToken<Map<String, Object>>(){}.getType();
Map<String, Object> myMap = gson.fromJson(str, type);

这不起作用.我发现该字符串可能不是JSON的通用类型，它类似于"Name = Peter，Date = 2017/12/01"，但它需要"Name":"Peter"，"Date":"2017/12"/01，对吗?那是问题吗?如何获取姓名的数据?谁能帮我吗?

This doesn't work. I found that maybe the string is not a general type of JSON, it is like "Name=Peter, Date=2017/12/01", but it needs "Name": "Peter", "Date": "2017/12/01" , right? Is that the problem? How can I get the data of Name? Can anyone help me?

已更新:我发现如果"Name" ="，则无法将其获取为字符串类型，则无法使用"data.get(" Name);".但是我仍然需要它.任何人都可以修复它吗?谢谢.

Updated: I found that if "Name" = "", then I couldn't get it as string type, I cannot use "data.get("Name");". But I still need it. Anyone can fix it? Thanks.

推荐答案

首先，您的JSON格式不正确，日期后不应使用逗号.并回答您的问题，根本不要使用地图.

First of all, your JSON is malformed, it shouldn't have a comma after date. and to answer your question, don't use map at all.

如果您确实想在不创建模型和其他类的情况下执行此操作，请按照以下方式进行操作:

If you really want to do it without creating a model and additional classes, do it this way:

Gson gson = new Gson();
Type resultType = new TypeToken<List<JsonObject>>() {}.getType();
List<JsonObject> result = gson.fromJson(info, resultType);
System.out.println(result.get(0).get("data").toString());
JsonObject data = result.get(0).get("data").getAsJsonObject();
System.out.println(data.get("Name"));

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