我需要将JSON响应转换为csv文件。我可以从这里成功使用蒂姆·耶茨的出色代码:Groovy code to convert json to CSV file
我现在还需要在csv中包括JSON的嵌套子图。地图和子地图之间的关系是1:1。
我一直无法为collect语句获得正确的语法,该语句将检索已解析的地图和子地图的键/值。
示例JSON
{items=
[
{
created_at=2019-03-27
, entity_id=1
, extension_attributes=[]
},
{
created_at=2019-03-27
, entity_id=2
, extension_attributes= { employee_id=Emp1, employee_type=CSR}//nested submap
}
]}
时髦
import groovy.json.*
def data = new JsonSlurper().parseText( json ); //"json" is from GET request
def columns = ["created_at","entity_id","employee_id","employee_type"]
def encode = { e -> e ? /"$e"/ : "$e"}
requestFile.append( columns.collect { c -> encode( c ) }.join( ',' ) + '\n');
requestFile.append( data.items.collect { row ->columns.collect { colName -> encode( row[ colName ] ).replaceAll("null","") }.join( ',' )}.join( '\n' ) );//unsure how to use data.items.collect to fetch submap
我想 1)如下转换JSON,以轻松收集每个键/值:
...
{
created_at=2019-03-27
, entity_id=2
, employee_id=Emp1
, employee_type=CSR
}
...
或2)找出是否可以使用Groovy的collect方法将地图/子地图检索为平面地图。
很不幸,我不是一名程序员,任何帮助将不胜感激!
答案 0 :(得分:0)
这里是flatten
闭包,它以递归方式展平一个项目:
def flatten
flatten = { row ->
def flattened = [:]
row.each { k, v ->
if (v instanceof Map) {
flattened << flatten(v)
} else {
flattened[k] = v
}
}
flattened
}
您应该在最后一行将row
替换为flatten(row)
,如下所示:
requestFile.append(data.items.collect { row ->
columns.collect {
colName -> encode(flatten(row)[colName]).replaceAll("null", "")
}.join(',')
}.join('\n'))
结果如下:
"created_at","entity_id","employee_id","employee_type"
"2019-03-27","1",,
"2019-03-27","2","Emp1","CSR"
答案 1 :(得分:0)
还发现以下内容允许使用collect方法来获取嵌套元素:
def m = data.items.collect{[/"${it?.created_at?:''}"/,/"${it?.extension_attributes?.entity_id?:''}"/,/"${it?.extension_attributes?.employee_id?:''}"/,/"${it?.extension_attributes?.employee_type?:''}"/]}
m.each{requestFile.append(it.join(',')+'\n')}