java获取ip地址

InetAddress addr = InetAddress.getLocalHost();
String ip=addr.getHostAddress().toString();//获得本机IP
String address=addr.getHostName().toString();//获得本机名称
System.out.println("ip:"+ip);

 

以上方法也能获取ip地址，但是获取的IP有时是本地连接的有时是宽带连接的。一个本机的ip包含两种ip，一种是内网的，就是局域网的，一种是外网的，能与internet建立联系的，用这种方法就会得到好几个ip，可以采取这种方法：

public static String getLocalIP() {
       
        Enumeration<NetworkInterface> allNetInterfaces = null;
        try {
            allNetInterfaces = NetworkInterface.getNetworkInterfaces();
        } catch (SocketException e) {
            e.printStackTrace();
        }

        String ip = null;

        label: while (allNetInterfaces.hasMoreElements()) {
            NetworkInterface netInterface = allNetInterfaces.nextElement();
            Enumeration<InetAddress> addresses = netInterface
                    .getInetAddresses();
            while (addresses.hasMoreElements()) {
                InetAddress address = addresses.nextElement();
                String tempIP = address.getHostAddress();
                if (address instanceof Inet4Address
                        && !address.isLoopbackAddress()
                        && tempIP.indexOf(".") != -1) {
                    ip = tempIP;
                    break label;
                }
            }
        }

        return ip;

    }

 

直接调用这个方法即可获取到