java 获取Linux中ip地址和网关，dns信息

获取Linux中的IP地址可以使用以下命令：

ifconfig | grep inet | awk '{print $2}' | cut -d':' -f2

获取网关信息可以使用以下命令：

ip route | grep default | awk '{print $3}'

获取DNS信息可以查看 `/etc/resolv.conf` 文件，该文件中包含DNS服务器的IP地址。可以使用以下命令：

cat /etc/resolv.conf | grep nameserver | awk '{print $2}'

相关问题

java 获取Linux，ip地址和网关

获取Linux操作系统的IP地址和网关可以通过使用命令行工具来实现，以下是获取IP地址和网关的命令：

1. 获取IP地址：

ifconfig

该命令可以列出网络接口信息，其中包括IP地址以及其他网络相关的信息。

2. 获取网关：

route -n

该命令可以列出当前系统的路由表信息，其中包括网关的IP地址以及其他网络相关的信息。

如果你是使用Java程序来获取IP地址和网关的话，可以通过使用NetworkInterface和InetAddress类来实现，以下是示例代码：

获取IP地址：

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.util.Enumeration;

public class GetIPAddress {
    public static void main(String[] args) throws Exception {
        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
        while (interfaces.hasMoreElements()) {
            NetworkInterface iface = interfaces.nextElement();
            if (iface.isLoopback() || !iface.isUp()) {
                continue;
            }

            Enumeration<InetAddress> addresses = iface.getInetAddresses();
            while (addresses.hasMoreElements()) {
                InetAddress addr = addresses.nextElement();
                if (addr.isLinkLocalAddress() || addr.isLoopbackAddress() || addr.isMulticastAddress()) {
                    continue;
                }
                System.out.println("IP地址：" + addr.getHostAddress());
            }
        }
    }
}

获取网关：

import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;

public class GetGateway {
    public static void main(String[] args) throws SocketException {
        Enumeration<NetworkInterface> interfaces = NetworkInterface.getNetworkInterfaces();
        while (interfaces.hasMoreElements()) {
            NetworkInterface iface = interfaces.nextElement();
            Enumeration<InetAddress> inetAddresses = iface.getInetAddresses();
            while (inetAddresses.hasMoreElements()) {
                InetAddress inetAddress = inetAddresses.nextElement();
                if (!inetAddress.isLinkLocalAddress() && !inetAddress.isLoopbackAddress()
                        && inetAddress instanceof java.net.Inet4Address) {
                    Enumeration<NetworkInterface> subInterfaces = iface.getSubInterfaces();
                    while (subInterfaces.hasMoreElements()) {
                        NetworkInterface subInterface = subInterfaces.nextElement();
                        Enumeration<InetAddress> subInetAddresses = subInterface.getInetAddresses();
                        while (subInetAddresses.hasMoreElements()) {
                            InetAddress subInetAddress = subInetAddresses.nextElement();
                            if (!subInetAddress.isLinkLocalAddress() && !subInetAddress.isLoopbackAddress()
                                    && subInetAddress instanceof java.net.Inet4Address) {
                                System.out.println("网关地址：" + subInetAddress.getHostAddress());
                            }
                        }
                    }
                }
            }
        }
    }
}

通过jjava代码， 获取Linux中ip地址和网关，及dns

可以使用Java代码来获取Linux中的IP地址、网关和DNS信息。以下是示例代码：

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class NetworkInfo {

    public static void main(String[] args) {
        try {
            String ip = getIPAddress();
            String gateway = getGateway();
            String[] dns = getDNS();

            System.out.println("IP Address: " + ip);
            System.out.println("Gateway: " + gateway);
            System.out.print("DNS: ");
            for (String server : dns) {
                System.out.print(server + " ");
            }
            System.out.println();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static String getIPAddress() throws IOException {
        Process process = Runtime.getRuntime().exec("ifconfig | grep inet | awk '{print $2}' | cut -d':' -f2");
        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
        String line = reader.readLine();
        return line;
    }

    public static String getGateway() throws IOException {
        Process process = Runtime.getRuntime().exec("ip route | grep default | awk '{print $3}'");
        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
        String line = reader.readLine();
        return line;
    }

    public static String[] getDNS() throws IOException {
        Process process = Runtime.getRuntime().exec("cat /etc/resolv.conf | grep nameserver | awk '{print $2}'");
        BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
        String line;
        StringBuilder output = new StringBuilder();
        while ((line = reader.readLine()) != null) {
            output.append(line);
            output.append(" ");
        }
        return output.toString().trim().split(" ");
    }
}

该代码使用 `Runtime.exec()` 方法执行系统命令，并使用 `BufferedReader` 读取命令输出。 `getIPAddress()` 方法获取IP地址， `getGateway()` 方法获取网关， `getDNS()` 方法获取DNS服务器的IP地址。注意，这些命令在Linux系统上执行，所以该代码只能在Linux系统上运行。