HttpServletRequest 获取ip地址

1public static String getIpAddr(HttpServletRequest request) {
2        String ip = request.getHeader("x-forwarded-for");
3        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
4            ip = request.getHeader("Proxy-Client-IP");
5        }
6        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
7            ip = request.getHeader("WL-Proxy-Client-IP");
8        }
9        if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
10            ip = request.getRemoteAddr();
11        }
12        return ip;
13    }