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使用json映射到具有特定键的列表

groovy

Mikael · 技术社区 · 7 年前

我已经成功地获得了一个json列表,并从json中获得了一个密钥。

我正在研究如何将每个版本值放入列表中。我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,它将抛出地图并只获取项目。并将其放入列表中。怎样

1 回复 | 直到 7 年前

Szymon Stepniak 7 年前

Groovy有 Collection.collect(closure) 可用于将一种类型的值列表转换为新值列表。考虑以下示例:

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 spread operator *. 这可以将此示例简化为以下内容:

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(你可以替换 *.version 只有 .version ):

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()

所有示例都产生相同的输出。

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