Java 获取http请求的ip地址

本文链接：https://blog.youkuaiyun.com/z12345614a/article/details/124477372

本文详细介绍了如何在Java中通过HttpServletRequest获取请求的IP地址，包括处理多层代理情况，从多种header中查找真实IP，最终返回可靠的结果。

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	/**
	 * 获取Ip地址
	 * @param request
	 * @return
	 */
	private 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;
	}