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ServletRequestAttributes sra = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
if(sra != null) {
    HttpServletRequest request = sra.getRequest();
    if(request != null) {
        MDC.put("ip", getRemoteHost(request));
    }
}

/**
 * 获取目标主机的ip
 */
private static String getRemoteHost(HttpServletRequest request) {
    String Xip = request.getHeader("X-Real-IP");
    String XFor = request.getHeader("X-Forwarded-For");
    if(StringUtils.isNotBlank(XFor) && !"unKnown".equalsIgnoreCase(XFor)) {
        // 多次反向代理后会有多个ip值，第一个ip才是真实ip
        int index = XFor.indexOf(",");
        if(index != -1) {
            return XFor.substring(0, index);
        } else {
            return XFor;
        }
    }
    XFor = Xip;
    if(StringUtils.isNotEmpty(XFor) && !"unKnown".equalsIgnoreCase(XFor)) {
        return XFor;
    }
    if(StringUtils.isBlank(XFor) || "unKnown".equalsIgnoreCase(XFor)) {
        XFor = request.getHeader("Proxy-Client-IP");
    }
    if(StringUtils.isBlank(XFor) || "unKnown".equalsIgnoreCase(XFor)) {
        XFor = request.getHeader("WL-Proxy-Client-IP");
    }
    if(StringUtils.isBlank(XFor) || "unKnown".equalsIgnoreCase(XFor)) {
        XFor = request.getHeader("HTTP_CLIENT_IP");
    }
    if(StringUtils.isBlank(XFor) || "unKnown".equalsIgnoreCase(XFor)) {
        XFor = request.getHeader("HTTP_X_FORWARDED_FOR");
    }
    if(StringUtils.isBlank(XFor) || "unKnown".equalsIgnoreCase(XFor)) {
        XFor = request.getRemoteAddr();
    }

    return XFor;
}