在Intranet中获得客户端IP地址

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要在Intranet中获得客户端的IP地址，用JS就可以搞定：

<html><head><mce:script language="javascript"></mce:script><mce:script language="javascript" event=OnObjectReady(objObject,objAsyncContext) for=foo></mce:script></head><body><OBJECT id=locator classid=CLSID:76A64158-CB41-11D1-8B02-00600806D9B6 VIEWASTEXT></OBJECT><OBJECT id=foo classid=CLSID:75718C9A-F029-11d1-A1AC-00C04FB6C223></OBJECT><SCRIPT language="javascript"> var service = locator.ConnectServer(); service.Security_.ImpersonationLevel=3; service.InstancesOfAsync(foo, 'Win32_NetworkAdapterConfiguration');</SCRIPT></body></html>

但在Internet中获得客户端的IP地址，至今我还没找到完整的方法，以下方法在Intranet中测试也只能获得IP地址四位数字的最后两位：

public static byte[] getIp() throws UnknownHostException { byte[] b = InetAddress.getLocalHost().getAddress(); Enumeration allNetInterfaces = null; try { allNetInterfaces = NetworkInterface.getNetworkInterfaces(); } catch (SocketException e) { e.printStackTrace(); } InetAddress ip = null; NetworkInterface netInterface = null; while (allNetInterfaces.hasMoreElements()) { netInterface = (NetworkInterface) allNetInterfaces.nextElement(); if (netInterface.getName().trim().equals("eth0")){ Enumeration addresses = netInterface.getInetAddresses(); while (addresses.hasMoreElements()) { ip = (InetAddress) addresses.nextElement(); } break; } } if (ip != null && ip instanceof Inet4Address) { return b = ip.getAddress(); } return b; }

网上的流传很多方法，但测试了之后，只能获得127.0.0.1，这里一样记录下来，留待以后研究：

public String getRemortIP(HttpServletRequest request) { if (request.getHeader("x-forwarded-for") == null) { return request.getRemoteAddr(); } return request.getHeader("x-forwarded-for"); }

public static String getIpAddr2(HttpServletRequest request){ String ipAddress = null; ipAddress = request.getRemoteAddr(); ipAddress = request.getHeader("x-forwarded-for"); if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) { ipAddress = request.getHeader("Proxy-Client-IP"); } if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) { ipAddress = request.getHeader("WL-Proxy-Client-IP"); } if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) { ipAddress = request.getRemoteAddr(); } //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割 if(ipAddress!=null && ipAddress.length()>15){ //"***.***.***.***".length() = 15 if(ipAddress.indexOf(",")>0){ ipAddress = ipAddress.substring(0,ipAddress.indexOf(",")); } } return ipAddress; }