Java獲取真實IP工具

import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

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

/**
 * 獲取真實ip
 *
 * @author 向振華
 * @date 2019/12/16 15:15
 */
public class IPUtil {

    public static String getIp() {
        // 獲取request
        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();
        ServletRequestAttributes servletRequestAttributes = (ServletRequestAttributes) requestAttributes;
        if (servletRequestAttributes == null){
            return null;
        }
        HttpServletRequest request = servletRequestAttributes.getRequest();
        if (request == null) {
            return null;
        }
        // 獲取IP
        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.getRemoteAddr();
            if("127.0.0.1".equals(ip) || "0:0:0:0:0:0:0:1".equals(ip)){
                try {
                    //根據網卡取本機配置的IP
                    ip= InetAddress.getLocalHost().getHostAddress();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
            }
        }
        //多個代理的情況取第一個爲真實IP
        if (ip.contains(",")) {
            ip = ip.split(",")[0];
        }
        return ip;
    }
}