获取请求客户端的真实IP地址

  /**
  * 获取请求客户端的真实IP地址
  * <功能详细描述>
  * @param request
  * @return [参数说明]
  *
  * @return String [返回类型说明]
  * @exception throws [违例类型] [违例说明]
  * @see [类、类#方法、类#成员]
  */
 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;    
 }