java 如何获取真实IP地址

public class IpAdrressUtil {
    /**
     * 获取Ip地址
     * @param request
     * @return
     */
    public static String getIpAdrress(HttpServletRequest request) {
        String Xip = request.getHeader("X-Real-IP");
        String XFor = request.getHeader("X-Forwarded-For");
		if (StringUtils.isNotEmpty(XFor) && !"unKnown".equalsIgnoreCase(XFor)) {
			// 多次反向代理后会有多个ip值，第一个ip才是真实ip
			int index = XFor.indexOf(",");
			if (index != -1) {
				return XFor.substring(0, index);
			} else {
				return XFor;
			}
		}
        XFor = Xip;
		if (StringUtils.isNotEmpty(XFor) && !"unKnown".equalsIgnoreCase(XFor)) {
			return XFor;
		}
		if (StringUtils.isBlank(XFor) || "unknown".equalsIgnoreCase(XFor)) {
			XFor = request.getHeader("Proxy-Client-IP");
		}
		if (StringUtils.isBlank(XFor) || "unknown".equalsIgnoreCase(XFor)) {
			XFor = request.getHeader("WL-Proxy-Client-IP");
		}
		if (StringUtils.isBlank(XFor) || "unknown".equalsIgnoreCase(XFor)) {
			XFor = request.getHeader("HTTP_CLIENT_IP");
		}
		if (StringUtils.isBlank(XFor) || "unknown".equalsIgnoreCase(XFor)) {
			XFor = request.getHeader("HTTP_X_FORWARDED_FOR");
		}
		if (StringUtils.isBlank(XFor) || "unknown".equalsIgnoreCase(XFor)) {
			XFor = request.getRemoteAddr();
		}
        return XFor;
    }
}

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