Question

我正在使用 InetAddress 类来获取网络上的IP地址。

问题是有时我无法获得某些地址，有时 InetAddress 无法从网络中获取单个IP。

可能是什么问题？谢谢

我试过下面的代码：

public void fatchAllNetworkIP() throws UnknownHostException, IOException
{
    System.out.println("Fetching IP...");

    InetAddress localhost = InetAddress.getLocalHost();
    byte[] ip = localhost.getAddress();

    for (int i = 1; i <= 254; i++)
    {
        ip[3] = (byte)i;
        InetAddress address = InetAddress.getByAddress(ip);

        if(address.isReachable(1000))
        {
            //JOptionPane.showMessageDialog(null, address);
            System.out.println("IP Address "+i+"is "+address);
        }
    }
}

Answer 1

尝试java.net.NetworkInterface，获取所有可用的NetworkInterfaces，然后获取所有附加的InetAddresses

Answer 2

尝试使用此示例获取192.168.x.x，

public static void main(String args[]) throws UnknownHostException {

        byte[] ip = {(byte)192, (byte)168, 0, 0}; //Note: for 192.168.0.x addresses  
        for (int i = 1; i <= 254; i++)  
        {  
            ip[3] = (byte) i;  
            InetAddress address = InetAddress.getByAddress(ip);  
            System.out.printf("InetAddress1: %s\n", address);
        } 


    }

Answer 3

您需要更改超时，以便系统可以检查是否有来自网络机器的回复..

if(address.isReachable(2000)) {
    System.out.println("IP Address "+i+"is "+address);
}

如果再次出现同样的问题，请尝试增加超时..

如何使用java获取网络上的所有IP地址？

3 个答案: