java获取客户端IP地址工具类

代码如下自取：

import lombok.extern.slf4j.Slf4j;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;


@Slf4j
public class IpUtil {

    
    public static String getIp(HttpServletRequest request) {
        // 反向代理时获取真实ip
        String ip = request.getHeader("X-Forwarded-For");
        if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
            // 多次反向代理后会有多个ip值，第一个ip才是真实ip
            if (ip.indexOf(",") > 0) {
                ip = ip.split(",")[0];
            }
        }
        //Proxy-Client-IP/WL- Proxy-Client-IP ：这个一般是经过apache http服务器的请求才会有，用apache http做代理时一般会加上Proxy-Client-IP请求头，而WL-Proxy-Client-IP是他的weblogic插件加上的头。
        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");
        }
        //有些代理服务器会加上此请求头
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("HTTP_CLIENT_IP");
        }
        //nginx代理一般会加上此请求头
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getHeader("X-Real-IP");
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            ip = request.getRemoteAddr();
            if ("127.0.0.1".equals(ip) || "0:0:0:0:0:0:0:1".equals(ip)) {
                //根据网卡取本机配置的IP
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                    ip = inet.getHostAddress();
                } catch (UnknownHostException e) {
                    log.error("x-forwarded-for：{}，Proxy-Client-IP：{}，WL-Proxy-Client-IP：{}，HTTP_CLIENT_IP：{}，X-Real-IP：{}，错误信息：{}", request.getHeader("X-Forwarded-For"), request.getHeader("Proxy-Client-IP"), request.getHeader("WL-Proxy-Client-IP"), request.getHeader("HTTP_CLIENT_IP"), request.getHeader("X-Real-IP"), e.getMessage());
                }
            }
        }
        return ip;
    }
}