java通过请求对象获取ip地址、获取ip地址

    /**
     * 获取客户端Ip
     *
     * @param request
     * @return
     */
    public static String getIP(HttpServletRequest request) {

        String ip = request.getHeader("X-Real-IP");

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("x-forwarded-for");
        } else {
            return ip;
        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
        } else {
            // 当有多级反向代理时，x-forwarded-for值为多个时取第一个ip地址
            if (ip.indexOf(IP_SEPARATOR) != -1) {
                ip = ip.substring(0, ip.indexOf(IP_SEPARATOR));
            }
            return ip;
        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
        } else {
            return ip;
        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
        } else {
            return ip;
        }

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = "";
        }
        return "0:0:0:0:0:0:0:1".equals(ip) ? "127.0.0.1" : ip;
    }

    /**
     * 获取登录ip
     */
    public String getIp(){        
        HttpServletRequest request = this.getRequest();
        String ip = "";
        if (request.getHeader("x-forwarded-for") == null) {  
            ip = request.getRemoteAddr();  
        }else{
            ip = request.getHeader("x-forwarded-for");  
        }
        return ip;
    }