获取真实ip地址的java代码如下:
/**
* 获取 真实的IP
*
*/
public static String getIp(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;
}
如果通过了多级反向代理的话,X-Forwarded-For的值并不止一个,而是一串Ip值,究竟哪个才是真正的用户端的真实IP呢?
答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。
如:
X-Forwarded-For:192.168.1.110, 192.168.1.120, 192.168.1.130, 192.168.1.100
用户真实IP为: 192.168.1.110
来源:oschina
链接:https://my.oschina.net/u/2731504/blog/680206