获取客户端的IP地址（过滤代理）

本是古典何须时尚 2023-06-15 04:52 13阅读 0赞

> 下面的工具， 能满足绝大部分应用环境，但并不是百分百。

//获取ip
        public static String getIpAddress(HttpServletRequest request) {
            String ip = null;
    
            //X-Forwarded-For：Squid 服务代理
            String ipAddresses = request.getHeader("X-Forwarded-For");
    
            if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
                //Proxy-Client-IP：apache 服务代理
                ipAddresses = request.getHeader("Proxy-Client-IP");
            }
    
            if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
                //WL-Proxy-Client-IP：weblogic 服务代理
                ipAddresses = request.getHeader("WL-Proxy-Client-IP");
            }
    
            if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
                //HTTP_CLIENT_IP：有些代理服务器
                ipAddresses = request.getHeader("HTTP_CLIENT_IP");
            }
    
            if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
                //X-Real-IP：nginx服务代理
                ipAddresses = request.getHeader("X-Real-IP");
            }
    
            //有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户端的真实IP
            if (ipAddresses != null && ipAddresses.length() != 0) {
                ip = ipAddresses.split(",")[0];
            }
    
            //还是不能获取到，最后再通过request.getRemoteAddr();获取
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
                ip = request.getRemoteAddr();
            }
            return ip;
        }