映射 JSON 到列表<Map<<String, Object>>

Question

我有一个JSON格式

[{
    "id" : "a01",
    "name" : "random1",
    "val" : "random2"

},
{
    "id" : "a03",
    "name" : "random3",
    "val" : "random4"
}]

我需要将它映射到一个 List 持有各种 Map 对象。我如何实现它？

即使我能够将此 JSON 转换为 String 的 List 形式

{
    "id" : "a01",
    "name" : "random1",
    "val" : "random2"

}

然后我有一种方法可以将每个 String 转换为 Map。

Answer 1

使用指定类型的 gson 转换为地图列表：

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

Answer 2

您需要将 TypeReference 传递给 readValue 并具有所需的结果类型：

ObjectMapper mapper = new ObjectMapper();
List<Map<String, Object>> data = mapper.readValue(json, new TypeReference<List<Map<String, Object>>>(){});

Answer 3

私有列表> map_string;

Json 你需要通过:-

{
"map_formula" : [ 
        {
            "A+" : "if(price<400),\"40000\",0",
            "B" : "",
            "c" : "",
            "d" : "",
            "e" : ""
        }, 
        {
            "poor" : "value for poor",
            "good" : "300",
            "average" : "300",
            "excellent" : "300"
        }
    ]
}

映射 JSON 到列表<Map<<String, Object>>

Map JSON To List<Map<<String, Object>>

java

json

jackson

objectmapper