/**
* 獲取Ip地址，多級反向代理
* @param request
* @return
*/
public static String getIpaddr(HttpServletRequest request){
		String 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")){  
                //根據網絡卡取本機配置的IP  
                InetAddress inet=null;  
                try {  
                    inet = InetAddress.getLocalHost();  
                } catch (UnknownHostException e) {  
                    e.printStackTrace();  
                }  
                ipAddress= inet.getHostAddress();  
            }  
        }  
        //對於通過多個代理的情況，第一個IP為客戶端真實IP,多個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; 
}