获取IP地址

public static String localIp(){  
        String ip = null;  
        Enumeration allNetInterfaces;  
        try {  
            allNetInterfaces = NetworkInterface.getNetworkInterfaces();              
            while (allNetInterfaces.hasMoreElements()) {  
                NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();  
                List<InterfaceAddress> InterfaceAddress = netInterface.getInterfaceAddresses();  
                for (InterfaceAddress add : InterfaceAddress) {  
                    InetAddress Ip = add.getAddress();  
                    if (Ip != null && Ip instanceof Inet4Address) {  
                        ip = Ip.getHostAddress();  
                    }  
                }  
            }  
        } catch (SocketException e) {  
        lg.warn("获取本机Ip失败:异常信息:"+e.getMessage());  
        }  
        return ip;  
    }  

public static String getUserIp() {
		HttpServletRequest request = getHttpServletRequest();
		String ipAddress = null;
		// ipAddress = this.getRequest().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();
			if (ipAddress.equals("127.0.0.1")
					|| ipAddress.equals("0:0:0:0:0:0:0:1")) {
				// 根据网卡取本机配置的IP
				InetAddress inet = null;
				try {
					inet = InetAddress.getLocalHost();
				} catch (UnknownHostException e) {
					e.printStackTrace();
				}
				ipAddress = inet.getHostAddress();
			}

		}

		// 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) {
			if (ipAddress.indexOf(",") > 0) {
				ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
			}
		}
		return ipAddress;
	}