获得ip

public class IP {
/**
*
* @param request
* @return
*/
public static String getIpAddr(HttpServletRequest request) {      
      String ip = request.getHeader("x-forwarded-for");      
      if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {      
          ip = request.getHeader("Proxy-Client-IP");      
      }      
      if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {      
          ip = request.getHeader("WL-Proxy-Client-IP");      
       }      
     if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {      
           ip = request.getRemoteAddr();      
      }      
     return ip;      
}
}