Restlet 介绍
一个用Java实现的轻量级REST框架
It supports all REST concepts (Resource, Representation, Connector, Component,
etc.) and is suitable for both client and server Web applications. It supports
major Web standards like HTTP, SMTP, XML, JSON, WADL, and Atom. Many
extensions are also available to integrate with Servlet, Spring, Jetty,
Grizzly, Simple, JAXB, JAX-RS, JiBX, Velocity, or FreeMarker. A GWT version is
also available.