Question

我有一个带嵌套字段的JSON：

  [
    {
    "Platform Parent Dato Id": "23768",
    "Platform Dato Id": "24138",
    "Platform Dato Name": "Random Europe",
    "Platform mission Id": "111112",
    "Platform submission Id": "638687",
    "Platform submission Flight Id": "863524",
    "Start Date": "2017-12-01",
    "End Date": "2017-12-02",
    "Platform Compensation": 109.0909,
    "Total Value": 909.0909,
    "Goal": "200000.0000",
    "Value Information": {
      "Platform Compensation": [
        {
          "Platform mission Id": "111112",
          "Platform submission Id": "638687",
          "Platform submission Flight Id": "863524",
          "Value Rate": "14.0000",
          "Value": 109.0909
        }
      ]
    }
  },
  {
    "Platform Parent Dato Id": "23768",
    "Platform Dato Id": "24138",
    "Platform Dato Name": "Random Europe",
    "Platform mission Id": "111113",
    "Platform submission Id": "638687",
    "Platform submission Flight Id": "863524",
    "Start Date": "2017-12-01",
    "End Date": "2017-12-02",
    "Platform Compensation": 109.0909,
    "Total Value": 909.0909,
    "Goal": "200000.0000",
    "Value Information": {
      "Platform Compensation": [
        {
          "Platform mission Id": "111113",
          "Platform submission Id": "638687",
          "Platform submission Flight Id": "863524",
          "Value Rate": "12.0000",
          "Value": 109.0909
        }
      ]
    }
  }
  ]

我正在使用JSONPATH从Value Rate嵌套中获取Value Information。

我已在此网站粘贴了我的JSON文字：http://jsonpath.com/ 并在使用此行后：

$[*].['Platform Compensation'].['Value Rate']

我得到了这个：

使用此行后：

$.['Value Information'].['Platform Compensation'].['Platform mission Id']

我得到了这个：

我想要返回（输出）的内容如下：

但我找不到合适的语法将这两者组合在一行中，并返回两个JSONPATH查询。

Answer 1

jsonpath可用于为给定的表达式选择值，并且在某些实现中，用于自定义谓词但不支持投影。

您可以使用jsonpath过滤给定的JSON。例如：

返回包含所有Platform Compensation值的数组：

$.['Value Information'].['Platform Compensation'].['Platform mission Id']

返回包含所有Platform mission Id值的数组：
```
$.['Value Information'].['Platform Compensation']
```

但您无法使用jsonpath来读取键和值的子集。要读取键和值的子集，您需要使用JSON de / serialization库。在Java世界中常用的库是Jackson和Gson。

以下是杰克逊的一个例子：

String json = "...";

ObjectMapper mapper = new ObjectMapper();
Map<String, Object> asMap = mapper.readValue(json, Map.class);

Map<String, Object> transformed = new HashMap<>();
transformed.put("Platform mission Id", asMap.get("Platform mission Id"));
transformed.put("Value Rate", asMap.get("Value Rate"));

String result = mapper.writeValueAsString(transformed);

Answer 2

Jayway实施让你这样做。 jsonpath将是 $.[*]['Value Information']['Platform Compensation'][*]['Platform mission Id', 'Value Rate']

您可以在此网站http://jsonpath.herokuapp.com/

中试用

嵌套JSON对象的Jsonpath

2 个答案: