java
import jakarta.servlet.http.HttpServletRequest;
public class IpUtils {
private static final String[] HEADERS = {
"X-Forwarded-For",
"Proxy-Client-IP",
"WL-Proxy-Client-IP",
"HTTP_X_FORWARDED_FOR",
"HTTP_X_FORWARDED",
"HTTP_X_CLUSTER_CLIENT_IP",
"HTTP_CLIENT_IP",
"HTTP_FORWARDED_FOR",
"HTTP_FORWARDED",
"HTTP_VIA",
"REMOTE_ADDR",
"X-Real-IP"
};
/**
* 判断ip是否为空，空返回true
* @param ip
* @return boolean
*/
public static boolean isEmptyIp(final String ip){
return (ip == null || ip.length() == 0 || ip.trim().equals("") || "unknown".equalsIgnoreCase(ip));
}
/***
* 获取客户端ip地址(可以穿透代理)
* @param request HttpServletRequest
* @return string
*/
public static String getIp(HttpServletRequest request) {
String ip = "";
for (String header : HEADERS) {
ip = request.getHeader(header);
if(!isEmptyIp(ip)) {
break;
}
}
if(isEmptyIp(ip)){
ip = request.getRemoteAddr();
}
if(!isEmptyIp(ip) && ip.contains(",")){
ip = ip.split(",")[0];
}
if (ip.contains(":") && ip.contains(".")) {
ip = ip.substring(ip.lastIndexOf(":") + 1);
}
return ip;
}
}