Groovy JSON转换为CSV

@Grab('com.opencsv:opencsv:5.5.2')
import groovy.json.JsonSlurper
import com.opencsv.CSVWriter

def json = '''
{
  "employees": [
    {
      "firstName": "John",
      "lastName": "Doe",
      "email": "john@example.com"
    },
    {
      "firstName": "Jane",
      "lastName": "Smith",
      "email": "jane@example.com"
    }
  ]
}
'''

def slurper = new JsonSlurper()
def data = slurper.parseText(json)

def csvData = data.employees.collect { employee ->
    [employee.firstName, employee.lastName, employee.email]
}

def writer = new CSVWriter(new FileWriter('output.csv'))
csvData.each { row ->
    writer.writeNext(row as String[])
}
writer.close()