Application.java

package controllers;

import com.google.gson.Gson;
import play.mvc.*;
import play.data.validation.*;

import java.util.*;

import models.*;

import com.thoughtworks.xstream.*;


public class Application extends Controller {

    public static void index() {
        Date now = new Date();
        render(now);
    }
    
    //V1 - Action dédiée + Serialisation avec XStream
    /*
    public static void listXml(){
      List<Contact> contacts = Contact.list();
      XStream xs = new XStream();
      String xml = xs.toXML(contacts);
      renderXml(xml);
    }
    */
    
    //v2 - Action dédiée + template xml
    /*
    public static void listXml(){
      List<Contact> contacts = Contact.list();
      render("Application/listXml.xml", contacts);
    }
    */
      
    //v3 - Réutilisation de l'action + utilisation de "format" + JSON
    public static void list() {
        List<Contact> contacts = Contact.list();
        if(request.format.equals("json"))
          renderJSON(contacts);
        else
          render(contacts);
    }
            
    public static void form(Long id) {
        if(id == null) {
            render();
        }
        Contact contact = Contact.findById(id);
        render(contact);
    }
    
    public static void save(@Valid Contact contact) {
        if(validation.hasErrors()) {
            if(request.isAjax()) error("Invalid value");
            render("@form", contact);
        }
        contact.save();
        list();
    }

}

list.xml

<?xml version="1.0"?>
<contacts>
  #{list items:contacts, as:'c'}
    <contact>
      <id>${c.id}</id>
      <firstname>${c.firstname}</firstname>
      <name>${c.name}</name>
      <birthdate>${c.birthdate}</birthdate>
      <email>${c.email}</email>
    </contact>
  #{/list}
</contacts>

routes

# Routes
# This file defines all application routes (Higher priority routes first)
# ~~~~

# Home page
GET     /                                       Application.index
GET     /contacts                               Application.list
POST    /contacts                               Application.save
GET     /contacts/{id}                          Application.form
GET     /contacts/new                           Application.form

##################
##   REST API   ##
##################
# V1 et V2
#GET    /contactsXML                            Application.listXml

# V3
GET     /contacts.{<json|xml|html>format}       Application.list(format:${format})

# Map static resources from the /app/public folder to the /public path
GET     /                                       staticDir:public