//解决代理服务器转发问题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.getHeader("HTTP_CLIENT_IP");    }    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {        ip = request.getHeader("HTTP_X_FORWARDED_FOR");    }    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {        ip = request.getRemoteAddr();    }    return ip;}