如何在 Mule 4 中动态设置 JSON 字段名称

Question

JSON 从 API 收到。

{
  "success": true,
  "timestamp": 1645988822,
  "base": "EUR",
  "date": "2022-02-27",
  "rates": {
    "AED": 4.140586,
    "AFN": 102.662987,
    "ALL": 121.380824,
    "AMD": 538.7856,
    "ANG": 2.016644,
    "AOA": 559.803561
  }
}

我在数据编织表达式中通过这种方式解析 JSON 但它给出了错误

%dw 2.0
output application/json
---
{
    "Result":
    {
        "Data":payload.rates.{Currency}        // Currency=AED  
    }
}

期望的JSON输出应该如下

{
    "Result":
    {
        "Data":4.140586
    }
}

Answer 1

您使用的语法不正确。 payload.rates 是一个对象，所以你可以只使用 dynamic selector:

%dw 2.0
output application/json
var selectedCurrency="AED"
---
{
    "Result":
    {
        "Data": payload.rates[selectedCurrency]
        
    }
}

输出：

{
  "Result": {
    "Data": 4.140586
  }
}

Answer 2

试试下面

输入：

{
  "success": true,
  "timestamp": 1645988822,
  "base": "EUR",
  "date": "2022-02-27",
  "rates": {
    "AED": 4.140586,
    "AFN": 102.662987,
    "ALL": 121.380824,
    "AMD": 538.7856,
    "ANG": 2.016644,
    "AOA": 559.803561
  }
}

数据编织

%dw 2.0
output application/json
---
{
    "Result":
    {
        "Data":payload.rates.AED        
    }
}

输出：

{
  "Result": {
    "Data": 4.140586
  }
}

如何在 Mule 4 中动态设置 JSON 字段名称

How to dynamically set JSON field name in Mule 4

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