基础设施对象Infrastructure
1.获取应用程序的虚拟目录名称String contextPath=this.getRequestCycle().getInfrastructure().getContextPath()
返回的字符串为“/app”
2.获取和jsp中对应的request和response对象
WebRequest request=this.getRequestCycle().getInfrastructure().getRequest();
WebResponse response=this.getRequestCycle.getInfrastructure().getResponse();
3.获取和jsp中对应的session对象
WebSession session=this.getRequestCycle().getInfrastructure().getRequest().getSession(false)
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