java獲取本機的ip地址

qking93415981發表於2020-04-06
Java
 

可以用如下程式碼:

           InetAddress inet = InetAddress.getLocalHost();
            System.out.println("本機的ip=" + inet.getHostAddress());

在window下面可以工作。在linux下返回127.0.0.1。主要是在linux下返回的是/etc/hosts中配置的localhost的ip地址，而不是網路卡的繫結地址。後來改用網路卡的繫結地址，可以取到本機的ip地址：） 

        Enumeration<NetworkInterface> netInterfaces = NetworkInterface.getNetworkInterfaces();
        InetAddress ip = null;
        while (netInterfaces.hasMoreElements()) {
            NetworkInterface ni = (NetworkInterface) netInterfaces.nextElement();
            System.out.println("---------------"+ni.getName()+"---------------");
            
            Enumeration<InetAddress> inets = ni.getInetAddresses();//這個疊代不能少，否則在Linux下會有錯
            while(inets.hasMoreElements()){
                ip = inets.nextElement();
                System.out.println(ip.getHostName() + "=" + ip.getHostAddress());
                
                if (ip.isSiteLocalAddress() && !ip.isLoopbackAddress() && ip.getHostAddress().indexOf(":") == -1) {
                    LOCAL_IP = ip.getHostAddress();
                    System.out.println(LOCAL_IP + " is site local address!");
                    //break;
                } else {
                    ip = null;
                }
            }
        }
        System.out.println("**********--->LOCAL_IP =" + LOCAL_IP);

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