Grails JsonBuilder Example

JsonBuilderExample.groovy

import groovy.json.*

class Person {
	String name
	List addresses = []
}

class Address {
	String address
	String state
}

Person p = new Person(name:"Frank")
p.addresses << new Address(address: "123 Street", state:"MN")
p.addresses << new Address(address: "987 Ave", state:"WI")


def builder = new JsonBuilder()

def root = builder.people {
    person {
        name "${p.name}"

        addresses(
	    p.addresses.collect{ 
               Address a -> [addr: a.address, state:a.state]
            }	
	)
    }
}

println builder.toPrettyString()

JsonBuilderOutput.json

{
    "people": {
        "person": {
            "name": "Frank",
            "addresses": [
                {
                    "addr": "123 Street",
                    "state": "MN"
                },
                {
                    "addr": "987 Ave",
                    "state": "WI"
                }
            ]
        }
    }
}

MarkupBuilderOutput.xml

<people>
  <person>
    <name>Frank</name>
    <addresses>
      <address>
        <addr>123 Street</addr>
        <state>MN</state>
      </address>
      <address>
        <addr>987 Ave</addr>
        <state>WI</state>
      </address>
    </addresses>
  </person>
</people>people