取浏览者IP地址

/**取IP地址
*@parma
*request——HttpServletRequest
*/

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;     
   }