Question

在我的应用程序中，我编写了查找用户的IP地址。

HttpServletRequest httpRequest = (HttpServletRequest) request;
String userIpAddress = httpRequest.getHeader("X-Forwarded-For");

        HttpServletRequest.getLocalAddr();

获取服务器ips可以这样做：

Inet4Address.getLocalHost().getHostAddress();

那么，如果用户已经从一个ip地址登录，如何限制他从另一个ip地址登录？

Answer 1

尝试以下代码：

Inet4Address address=(Inet4Address) Inet4Address.getLocalHost();
System.out.println(address.getHostAddress());

Inet4Address来自java.net.Inet4Address;

Answer 2

在LAN中查找主机地址的最佳方法可以按如下方式完成：

System.out.println(InetAddress.getByName("anyhostname").getHostAddress());

Answer 3

试试这个，它将枚举本地机器的所有接口地址。

   try {
        Enumeration<NetworkInterface> interfaceEnumeration =
                NetworkInterface.getNetworkInterfaces();
        while (interfaceEnumeration.hasMoreElements()) {
            Enumeration<InetAddress> inetAddressEnumeration =
                    interfaceEnumeration.nextElement().getInetAddresses();
            while (inetAddressEnumeration.hasMoreElements()) {
                System.out.println(inetAddressEnumeration.nextElement().getHostAddress());
            }
        }
    } catch (SocketException e) {
        e.printStackTrace();
    }

但是下面的方法不可靠，在我的测试环境中，它总是返回循环接口地址。

    try {
        InetAddress inetAddress[] = InetAddress.getAllByName("localhost");
        for (InetAddress address : inetAddress) {
            System.out.println(address.getHostAddress());
        }
    } catch (UnknownHostException e) {
        e.printStackTrace();
    }

如何防止用户从两个ip地址登录？

3 个答案: