... 前端控制器模式（Front Controller Pattern） 拦截过滤器模式（Intercepting Filter Pattern） 服务定位器模式（Service Locator Pattern） ...
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拦截过滤器模式用一个过滤器封装了已有应用资源，这个过滤器拦截了请求的接收及响应的传递。
The Intercepting filter pattern wraps existing application resources with a filter that intercepts the reception of a request and the transmission of a response.
当open Session in View模式作为过滤器或拦截器实现时，持久化上下文对象在视图呈现期间会保持打开状态。
When open Session in view is implemented as a filter or interceptor, the persistence-context object remains open during view rendering.
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