【支付系统】java如何获取请求的来源ip

        对于接入支付,肯定是要获取用户发起支付请求时的来源ip,目前市面上的三方支付平台大多都需要传递请求来源,因为他们要保证下单和最终付款的ip处于同一个地点(具体规则各个平台不一致,但目的相同).

        当然如果你要制作自己的支付平台,那肯定是要使用者来传递ip,而不是平台自己获取ip,平台自己获取的ip只是使用者服务器的ip,这样是不准确的有可能会造成无法支付.

import cn.hutool.core.util.StrUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

@Slf4j
public class IpUtil {

	/**
	 * 获取客户端ip地址
	 */
	public static String getClientIp() {
		String unknown = "unknown";
		HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
		String ip = request.getHeader("x-forwarded-for");
		log.info("x-forwarded-for ip: " + ip);
		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.contains(",")) {
				String[] realIp = ip.split(",");
				if ("127.0.0.1".equals(realIp[0])) {
					ip = realIp[1];
				}
				else {
					ip = realIp[0];
				}
			}
		}
		if (StrUtil.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
			ip = request.getHeader("Proxy-Client-IP");
			log.info("Proxy-Client-IP ip: " + ip);
		}
		if (StrUtil.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
			ip = request.getHeader("WL-Proxy-Client-IP");
			log.info("WL-Proxy-Client-IP ip: " + ip);
		}
		if (StrUtil.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
			ip = request.getHeader("HTTP_CLIENT_IP");
			log.info("HTTP_CLIENT_IP ip: " + ip);
		}
		if (StrUtil.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
			ip = request.getHeader("HTTP_X_FORWARDED_FOR");
			log.info("HTTP_X_FORWARDED_FOR ip: " + ip);
		}
		if (StrUtil.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
			ip = request.getHeader("X-Real-IP");
			log.info("X-Real-IP ip: " + ip);
		}
		if (StrUtil.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
			ip = request.getRemoteAddr();
			log.info("getRemoteAddr ip: " + ip);
		}
		log.info("获取客户端ip: " + ip);
		return StrUtil.trim(ip);
	}

}

以上就是获取用户ip来源的实现方式