获取主机IP：request.getRemoteAddr()
获取主机名：request.getRemoteHost()
获取端口号：request.getServerPort()
获取请求URI（相对路径）：request.getRequestURI
获取请求URL（绝对路径）：request.getRequestURL
获取请求SESSIONID：request.getRequestedSessionId
获取请求方法：request.getMethod
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