There's more to building RESTful web services than what is covered here. You can continue your exploration of Spring and REST with the following resources.
- Consuming a RESTful Web Service
- Consuming a RESTful Web Service with rest.js
- Consuming a RESTful Web Service with Backbone.js
- Consuming a RESTful Web Service with Sencha Touch
- Consuming a RESTful Web Service with jQuery
- Consuming a RESTful Web Service with AngularJS
- Consuming a RESTful Web Service with Spring for Android
- Consuming XML from a RESTful Web Service with Spring for Android
- Building a RESTful Web Service
- Building a RESTful Web Service with Spring Boot Actuator
- Building a Hypermedia-Driven RESTful Web Service