Groovy 使用json映射到具有特定键的列表

我已经设法从json列表中取出一个json，并从json中取出一个密钥

我正在研究如何将每个版本值放入列表中。如何从地图上做到这一点

Map convertedJSONMap = new JsonSlurperClassic().parseText(data)

//If you have the nodes then fetch the first one only
if(convertedJSONMap."items"){
    println "Version : " + convertedJSONMap."items"[0]."version"
}   

所以我需要的是某种foreach循环，它将抛出地图并获取项目。从每个版本中选择一个版本，并将其放入列表中。怎么做

Groovy有一个可用于将一种类型的值列表转换为新值列表的函数。考虑下面的例子：

import groovy.json.JsonSlurper

def json = '''{
    "items": [
        {"id": "ID-001", "version": "1.23", "name": "Something"},
        {"id": "ID-002", "version": "1.14.0", "name": "Foo Bar"},
        {"id": "ID-003", "version": "2.11", "name": "Something else"},
        {"id": "ID-004", "version": "8.0", "name": "ABC"},
        {"id": "ID-005", "version": "2.32", "name": "Empty"},
        {"id": "ID-006", "version": "4.11.2.3", "name": "Null"}
    ]
}'''

def convertedJSONMap = new JsonSlurper().parseText(json)

def list = convertedJSONMap.items.collect { it.version }

println list.inspect()

输出：

['1.23', '1.14.0', '2.11', '8.0', '2.32', '4.11.2.3']

Groovy还提供了可以将此示例简化为以下内容的功能：

import groovy.json.JsonSlurper

def json = '''{
    "items": [
        {"id": "ID-001", "version": "1.23", "name": "Something"},
        {"id": "ID-002", "version": "1.14.0", "name": "Foo Bar"},
        {"id": "ID-003", "version": "2.11", "name": "Something else"},
        {"id": "ID-004", "version": "8.0", "name": "ABC"},
        {"id": "ID-005", "version": "2.32", "name": "Empty"},
        {"id": "ID-006", "version": "4.11.2.3", "name": "Null"}
    ]
}'''

def convertedJSONMap = new JsonSlurper().parseText(json)

def list = convertedJSONMap.items*.version

println list.inspect()

甚至这个（您可以用

.version

替换

.version

）：

---

所有示例都产生相同的输出。

绝对完美的答案。谢谢

import groovy.json.JsonSlurper

def json = '''{
    "items": [
        {"id": "ID-001", "version": "1.23", "name": "Something"},
        {"id": "ID-002", "version": "1.14.0", "name": "Foo Bar"},
        {"id": "ID-003", "version": "2.11", "name": "Something else"},
        {"id": "ID-004", "version": "8.0", "name": "ABC"},
        {"id": "ID-005", "version": "2.32", "name": "Empty"},
        {"id": "ID-006", "version": "4.11.2.3", "name": "Null"}
    ]
}'''

def convertedJSONMap = new JsonSlurper().parseText(json)

def list = convertedJSONMap.items.version

println list.inspect()