Comet4J(Comet for Java)是一个纯粹基于AJAX(XMLHTTPRequest)的服务器推送框架，消息以JSON方式传递，具备长轮询、长连接、自动选择三种工作模式。
Comet4J(Comet for Java)是一个纯粹基于AJAX(XMLHTTPRequest)的服务器推送框架，消息以JSON方式传递，具备长轮询、长连接、自动选择三种工作模式。
功能特性 推送消息广播。 推送定向消息。 提供连接上线前、上线、下线前、下线、发送消息等多种可处理事件。 消息缓存机制，确保长轮询工作模式下不丢失消息。 客户端正常下线，服务端可立即感知。 客户端异常停止工作，服务端可定时检查并感知。 以注册通道应用的方式，让开发者对框架功能进行扩展，实现自己的应用。
框架特性 独立小巧，不依赖于第三方包。 与应用紧密集成，无需独立应用或服务器。 与Session无关的连接机制，为开发人员提供最大程度的功能可控性。 面向事件编程，客户端与服务器端均为事件驱动开发模式，提供了良好的可扩展性机制。 各项性能参数均可配置。 支持多种主流浏览器，并支持Air应用环境。
服务器支持情况 Tomcat6、Tomcat7
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