如果获取不到则需要对IE浏览器进行设置。具体设置如下：
请设置IE浏览器-工具-安全-自定义级别-ActiveX第三项‘对没有标记为安全的ActiveX控件进行初始化和脚本运行’为启用，点击确定后刷新重新登录!
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>JavaScript获取客户端IP</title> <script type="text/javascript" language="javascript"> <!-- function GetLocalIPAddress() { var obj = null; var rslt = ""; try { obj = new ActiveXObject("rcbdyctl.Setting"); rslt = obj.GetIPAddress; obj = null; } catch(e) { //异常发生 } return rslt; } function getMac(){ var locator = new ActiveXObject ("WbemScripting.SWbemLocator"); var service = locator.ConnectServer("."); var properties = service.ExecQuery("Select * from Win32_NetworkAdapterConfiguration Where IPEnabled =True"); var e = new Enumerator (properties); { var p = e.item(); var mac = p.MACAddress; return mac } } //--> function init () { var ip = GetLocalIPAddress(); var mac = getMac(); fm.clientIP.value = ip; fm.clientMAC.value = mac; } </script> </head> <body onload="init();"> <form name = 'fm'> 通过JavaScript获取的IP信息：<input type ='text' name = 'clientIP'><br> 通过JavaScript获取的MAC信息：<input type='text'name = 'clientMAC'> 通过JSP获取的IP信息：<%= request.getRemoteAddr() %> </form> </body> </html>