Save result to a new csv file instead of println Groovy - json

Question

How can I save result of groovy script to a new file? C:/temp/all1.csv. I want to parse json file to csv, script is working fine but I don't know how can I save result in a new file. Please help.
import groovy.json.*
import java.io.File
def json ='''
{
"expand": "schema,names",
"startAt": 0,
"maxResults": 50,
"total": 21,
"issues": [
{
"expand": "operations,versionedRepresentations",
"id": "217580",
"self": "issue/217580",
"key": "ART-4070",
"fields": {"summary": "#[ART] Pre.3 Verification \\"S\\""}
},
{
"expand": "operations,versionedRepresentations",
"id": "217579",
"self": "issue/217579",
"key": "ART-4069",
"fields": {"summary": "Verification \\"C\\""}
},
{
"expand": "operations,versionedRepresentations",
"id": "217577",
"self": "issue/217577",
"key": "ART-4068",
"fields": {"summary": "#[ART] Enum type"}
}
]
}
'''
File csvFile = new File( 'C:/temp/all1.csv')
def jsonSlurper = new JsonSlurper()
def config = [ // header -> extractor
"key": { it.key },
"summary": { it.fields.summary }
]
def encode(e) { // help with nulls; quote the separator
(e ?: "").replaceAll(";", "\\;")
}
def csvLine(items) { // write items as "CSV"
println(items.collect{ encode it }.join(";"))
}
def obj = new JsonSlurper().parseText(json)
csvLine(config.keySet())
obj.issues.each{ issue ->
csvLine(config.values().collect{ f -> f issue })
}
result:
key;summary
ART-4070;#[ART] Pre.3 Verification "S"
ART-4069;Verification "C"
ART-4068;#[ART] Enum type

Answer 1

To go with the current code, you could use csvFile.append(...) instead of println inside your
csvLine function and depending on your amount of real data, this might
be a good compromise between performance and resource.
Or you can write the whole CSV at once. E.g.
// prepare whole table
def data = [config.keySet()]
data.addAll(
obj.issues.collect{ issue ->
config.values().collect{ f -> f issue }
}
)
// write table as csv
def csvFile = "/tmp/out.csv" as File
csvFile.text = data.collect{
it.collect{ encode it }.join(";")9
}.join("\n")