获取请求主机的IP和获取本机IP_获取请求主机ip地址,如果通过代理进来-CSDN博客

本文链接：https://blog.csdn.net/csdnbeyoung/article/details/101105572

本文详细介绍了在Java中如何从HttpServletRequest获取客户端的真实IP地址，包括穿透代理和防火墙的情况，同时提供了在Windows和Linux环境下获取本机IP的通用方法。

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获取请求主机的IP,如果请求通过代理进来，则透过防火墙获取真实IP地址;

public final static String getIpAddress(HttpServletRequest request) throws IOException {
        // 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址  

        String ip = request.getHeader("X-Forwarded-For");

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
            }
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_CLIENT_IP");
            }
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            }
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
        } else if (ip.length() > 15) {
            String[] ips = ip.split(",");
            for (int index = 0; index < ips.length; index++) {
                String strIp = (String) ips[index];
                if (!("unknown".equalsIgnoreCase(strIp))) {
                    ip = strIp;
                    break;
                }
            }
        }
        return ip;
    }

本机ip的获取方式：

1.windows环境下

//windows下获取
    public static String getHostAddress() {
        try {
            return InetAddress.getLocalHost().getHostAddress();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        }
        return null;
    }

2.window和linux下通用方式

//windows和linux下获取
    public static String getIpAddress() {
        try {
            Enumeration<NetworkInterface> netInterfaces = NetworkInterface.getNetworkInterfaces();
            InetAddress ip = null;
            while (netInterfaces.hasMoreElements()) {
                NetworkInterface networkInterface = netInterfaces.nextElement();
                // 是环回接口|是子接口（虚拟接口）|网络接口没有启动并运行 则跳过
                if (networkInterface.isLoopback() || networkInterface.isVirtual() || !networkInterface.isUp()) {
                    continue;
                } else {
                    Enumeration<InetAddress> addresses = networkInterface.getInetAddresses();
                    while (addresses.hasMoreElements()) {
                        ip = addresses.nextElement();
                        if (ip != null && ip instanceof Inet4Address) {
                            //返回ipv4的地址
                            return ip.getHostAddress();
                        }
                    }
                }
            }
        } catch (Exception e) {
            logger.error("",e);
        }
        return null;
    }