java获取网络请求ip

/** 
     * 获取当前网络请求ip 
     * @param request 
     * @return 
     */
    public 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")) {
                //根据网卡取本机配置的IP  
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ipAddress = inet.getHostAddress();
            }
        }
        //对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割  
        if (ipAddress != null && ipAddress.length() > 15) { 
           //"***.***.***.***".length() = 15  
            String[] ips = ipAddress.split(",");
            if (ips != null && ips.length > 0) {
                ipAddress = StrUtil.strnull(ips[0]);
            }
        }
        return ipAddress;
    }