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1,web应用的分层
交互层，表现数据，收集数据，也就是视图层，接受请求，通过处理层完成相应的响应。（V，C）
处理层，完成数据的处理，也就是业务层（M）。
MVC设计模式（应用观察者模式的框架模式）
M model，模型，操作数 ...
严重: A web application created a ThreadLocal with key of type [null] (value [com.sun.faces.config.ConfigureListener$1@1c4e792]) and a value of type [null] (value [null]) but failed to remove it when the web application was stopped. To prevent a memory leak, the ThreadLocal has been forcibly removed.
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Server Tomcat v6.0 Server at localhost was unable to start within 45 seconds. If the server requires more time, try increasing the timeout in the server editor. 修改 workspace\.metadata\.plugins\org.eclipse.wst.server.core\servers.xml文件。 <servers> <server hostname="localhost" id=&quo ...