如何使用groovy builder生成数组类型的json? [英] How to use groovy builder to generate an array-type json?

问题描述

我们可以通过groovy的json builder生成一个对象类型的json:

def builder = new groovy.json.JsonBuilder()def root = builder.people {人 {名字 'Guillame'姓氏拉福奇"//命名参数也是对象的有效值地址(城市:'巴黎'，国家:'法国'，邮编:12345，)结婚是真的//一个值列表会议JavaOne"、Gr8conf"}}def jsonStr = builder.toString()

我喜欢这种类型的语法，但是如何构建一个数组类型的 json?

例如

<预><代码>[{代码":111"，价值":222"}，{代码":222"，价值":444"}]

我发现一些文档说我们应该使用 JsonBuilder() 构造函数:

def mydata = [ ["code": "111", "value":"222"],["code": "222", "value":"444"] ]def builder = new groovy.json.JsonBuilder(mydata)def jsonStr = builder.toString()

但我更喜欢第一种语法.能不能用它生成数组类型的json?

解决方案

您提出的语法看起来不太可能，因为我认为它不是有效的 groovy.诸如 {"blah":"foo"} 之类的闭包对 groovy 没有意义，并且您将受到语法限制的约束.我认为您将能够做的最好的事情是以下内容:

def root = builder.call ([{代码111"值222"},{代码222"；value "444"},//注意这些是闭包中的语句，所以 ';'分隔而不是 ','，并且没有使用 ':'[code: "333", value:"555"],//地图也允许[1,5,7]//作为嵌套列表])

We can generate an object-type json by groovy's json builder:

def builder = new groovy.json.JsonBuilder()
def root = builder.people {
    person {
        firstName 'Guillame'
        lastName 'Laforge'
        // Named arguments are valid values for objects too
        address(
               city: 'Paris',
               country: 'France',
               zip: 12345,
        )
        married true
        // a list of values
        conferences 'JavaOne', 'Gr8conf'
    }
}
def jsonStr = builder.toString()

I like this type of syntax, but how to build an array-type json?

E.g.

[
    {"code": "111", "value":"222"},
    {"code": "222", "value":"444"}
]

I found some documents which say we should use JsonBuilder() constructor:

def mydata = [ ["code": "111", "value":"222"],["code": "222", "value":"444"] ]
def builder = new groovy.json.JsonBuilder(mydata)
def jsonStr = builder.toString()

But I preferred the first syntax. Is it able to use it generate array-type json?

解决方案

The syntax you propose doesn't look possible, as I don't believe it's valid groovy. A closure such as {"blah":"foo"} doesn't makes sense to groovy, and you're going to be constrained by syntactical limitations. I think the best you're going to be able to do is something within the following:

def root = builder.call (
   [
      {
        code "111"
        value "222"
      },
      {code "222"; value "444"}, //note these are statements within a closure, so ';' separates instead of ',', and no ':' used
      [code: "333", value:"555"], //map also allowed
      [1,5,7]                     //as are nested lists
   ]
)

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