Build JSON as an array element - json

Question

I have this JSON Builder Groovy code:
import groovy.json.JsonBuilder
import groovy.json.JsonOutput
import groovy.json.StreamingJsonBuilder
class JSONTest {
public static main(args) {
StringWriter writer = new StringWriter()
StreamingJsonBuilder builder = new StreamingJsonBuilder(writer)
builder.requests {
name 'HSV Maloo'
make 'Holden'
year 2006
country 'Australia'
}
String json = JsonOutput.prettyPrint(writer.toString())
println json
}
}
It produces output like this:
{
"requests": {
"name": "HSV Maloo",
"make": "Holden",
"year": 2006,
"country": "Australia"
}
}
But I want to make the output like this with the requests value as an array element:
{
"requests": [{
"name": "HSV Maloo",
"make": "Holden",
"year": 2006,
"country": "Australia"
}]
}
How I can change the output?

Answer 1

You can do this by using the form of the StreamingJsonBuilder DSL that allows you to pass an element name, a collection, and a closure to iterate over the collection with.
def requests = [
[name: 'HSV Maloo', make: 'Holden', year: 2006, country: 'Australia']
]
StringWriter writer = new StringWriter()
StreamingJsonBuilder builder = new StreamingJsonBuilder(writer)
builder.requests requests, { request ->
name request.name
make request.make
year request.year
country request.country
}
String json = JsonOutput.prettyPrint(writer.toString())
println json
Which will produce:
{
"requests": [
{
"name": "HSV Maloo",
"make": "Holden",
"year": 2006,
"country": "Australia"
}
]
}