这段代码主要用于从HttpServletRequest中获取客户端的真实IP地址，通过检查多个可能包含IP的头部字段，如x-forwarded-for、Proxy-Client-IP、WL-Proxy-Client-IP和X-Real-IP，最后如果所有尝试都失败，则返回`request.getRemoteAddr()`的值。该方法对于处理代理服务器和负载均衡场景下的IP获取尤为关键。
public static String getRequestRealIp(HttpServletRequest request) {
String ip = request.getHeader("x-forwarded-for");
if (ip != null && ip.contains(",")) {
ip = ip.split(",")[0];
}
if (!checkIp(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if (!checkIp(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if (!checkIp(ip)) {
ip = request.getHeader("X-Real-IP");
}
if (!checkIp(ip)) {
ip = request.getRemoteAddr();
}
return ip;
}
private static boolean checkIp(String ip) {
if (ip == null || ip.length() == 0 || "unkown".equalsIgnoreCase(ip) ) {
return false;
}
return true;
}
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