[网络协议]使用Java获取发送请求的电脑的IP地址

获取发送请求的电脑的IP地址，并返回

package com.lc.z.common.utils;

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

import javax.servlet.http.HttpServletRequest;

public class IpUtil {

    /**
     * 获取请求的ip
     */
    public static String getRequestIp() {

        RequestAttributes requestAttributes = RequestContextHolder.getRequestAttributes();

        // 从获取RequestAttributes中获取HttpServletRequest的信息
        HttpServletRequest request = (HttpServletRequest) requestAttributes.resolveReference(RequestAttributes.REFERENCE_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".

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