Pluto is the Reference Implementation of the Java Portlet Specification. The current version of this Portlet specification is JSR 168 1.0 Portlets are designed to run in the context of a portal. They are written to the Portlet API. Pluto implements the contract, the Portlet API, between portlets and portals. Pluto is a portlet container.
Portlet API规范（JSR 168）的Portlet容器的实现，它为开发者提供了一个运行portlets的工作平台。
