JSP获取网络IP地址

import javax.servlet.http.HttpServletRequest;

public class RemoteAddress {

    public static String getRealClientIP(HttpServletRequest request) {
        String ip = request.getHeader("X-Forwarded-For");
        System.out.println(ip);
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("Proxy-Client-IP");
            System.out.println(ip);
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("WL-Proxy-Client-IP");
            System.out.println(ip);
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            System.out.println(ip);
        }

        return ip;
    }
}