我想用JSON-Builder创建一个数组。

预期格式:

{
  "Header": {
    "SomeKey" : "SomeValue"
 }
  "Data": [
    {
      "SomeKey" : "SomeValue"
    },
    {
     "SomeKey" : "SomeValue"
    }
  ]
}

我的代码:
    def builder = new groovy.json.JsonBuilder()

    def root = builder {
        Header {
        "Typ" "update"
        "Code" "UTF-8"
        "TransaktionsNr" item.transactionNumber
        "DatumZeit" new Date().format("dd.MM.yyyy HH:mm")
    }

    customers.each ({ customer->
        "Data" {
            "Email" customer.code
            "Newsletter" customer.newsletterSubscribed
        }
    })

但是,无论我做什么,我只会在“数据”部分获得一个元素。我尝试使用[]代替{},但是我仍然只得到一个元素,我在做什么错呢?

最佳答案

这是JSON结构的重复键。 There should not be duplicate key in the same hierarchy or they will override each other:

class Customer { String code; boolean newsletterSubscribed }

customers = [
  new Customer(code:"11111", newsletterSubscribed:true),
  new Customer(code:"22222", newsletterSubscribed:false)
]

def builder = new groovy.json.JsonBuilder()

def root = builder {
  Header {
    "Typ" "update"
    "Code" "UTF-8"
    "TransaktionsNr" 987
    "DatumZeit" new Date().format("dd.MM.yyyy HH:mm")

  }

  customers customers.collect { customer ->
        ["Email":customer.code,
        "Newsletter":customer.newsletterSubscribed]
    }

}

assert builder.toString() == {"Header":{"Typ":"update","Code":"UTF-8","TransaktionsNr":987,"DatumZeit":"21.12.2012 13:38"},"Data":{"Email":"22222","Newsletter":false},"customers":[{"Email":"11111","Newsletter":true},{"Email":"22222","Newsletter":false}]}

09-30 14:58
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