获取客户端真实IP

 /**
     * 该方法实现获取客户端真实地址
     * @author Yang,Hualong
     * @param request
     * @return
     */
    public 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;  
  }