Criando um arquivo csv

CSV.groovy

// font: http://www.groovyexamples.org/2010/06/21/create-a-csv-file/
//For this example, let’s assume we have an array of maps as our data.

def planets = [
    [id:'1',color:'red',planet:'mars',description:'Mars, the "red" planet'],
    [id:'2',color:'green',planet:'neptune',description:'Neptune, the "green" planet'],
    [id:'3',color:'blue',planet:'earth',description:'Earth, the "blue" planet'],
]

//Next, we can create our CSV file as follows:

def out = new File('planets.csv')
planets.each {
    def row = [it.id, it.color, it.planet]
    out.append row.join(',')
    out.append '\n'
}
/*
Which creates a file with the following content:

1,red,mars
2,green,neptune
3,blue,earth

*/