Several methods of obtaining IP address in Java

Here are some ideas on how to get IP addresses in Java.

1, directly using the Java.net.InetAddress class to obtain, but this method is only valid in the Windows environment, in the Linux environment can only obtain the localhost address (that is, the/etc/hosts file content)

The code is as follows:

1     Importjava.net.InetAddress;2 3     /**4 * This method works on Windows system.5 * in Linux system it returns 127.0.0.1 the content of the the Hosts file.6      */7      Public Static voidgetipaddressinwindows () {8         Try {9InetAddress address =inetaddress.getlocalhost ();TenSystem.out.println ("Host Name:" +address.gethostname ()); OneSystem.out.println ("Host Address:" +address.gethostaddress ()); A  -}Catch(unknownhostexception e) { - e.printstacktrace (); the         } -}

2, the method that can work normally under Linux, the code is as follows:

Import java.net.Inet4Address;
Import java.net.InetAddress;
Import Java.net.NetworkInterface;
Import java.net.SocketException;
Import java.net.UnknownHostException;
Import java.util.Enumeration;

    /*** This method is used-get all IP addresses from the network interfaces. * Network Interfaces:eth0, Wlan0, L0, Vmnet1, Vmnet8*/     Public Static voidgetallipaddress () {Try {            //Get all network interfaceEnumeration<networkinterface> allnetworkinterfaces =networkinterface.getnetworkinterfaces (); NetworkInterface NetworkInterface=NULL; //Check if there is more than one network interface             while(Allnetworkinterfaces.hasmoreelements ()) {//Get Next network interfaceNetworkInterface =allnetworkinterfaces.nextelement (); //output interface ' s nameSYSTEM.OUT.PRINTLN ("Network interface:" +networkinterface.getdisplayname ()); //get all IP address the bound to this network interfaceEnumeration<inetaddress> allinetaddress =networkinterface.getinetaddresses (); InetAddress ipAddress=NULL; //Check if there is more than one IP addresses//Band to one network interface                 while(Allinetaddress.hasmoreelements ()) {//Get Next IP addressIpAddress =allinetaddress.nextelement (); if(IpAddress! =NULL&& ipAddressinstanceofinet4address) {System.out.println ("IP Address:" +ipaddress.gethostaddress ()); }                }            }                    } Catch(SocketException e) {e.printstacktrace (); }    }//End Method Getallipaddress                            

Above this method some shortcomings, it will output all the network card IP address, sometimes we only need one or a few separate network card IP, can be obtained by the following methods:

1

Import java.net.Inet4Address;
Import java.net.InetAddress;
Import Java.net.NetworkInterface;
Import java.net.SocketException;
Import java.net.UnknownHostException;
Import java.util.Enumeration;

       /**2 * This method was used to get the IP address by network interface ' s name.3      * @paramNetworkinterfacename Network interface ' s name4      * @returnreturn True if get IP address successfully,5 * Otherwise return false.6      */7      Public Static Booleangetipaddrbyname (String networkinterfacename) {8         Try {9  　　　　　　　  //Get network interface by nameTenNetworkInterface NetworkInterface = One Networkinterface.getbyname (networkinterfacename); A             if(NetworkInterface = =NULL) { -                 return false; -             } theSYSTEM.OUT.PRINTLN ("Network interface:" + - networkinterface.getdisplayname ()); -              -InetAddress ipAddress =NULL; +             //get all IP addresses band to this interface -Enumeration<inetaddress> addresses =networkinterface.getinetaddresses (); +              A              while(Addresses.hasmoreelements ()) { atIpAddress =addresses.nextelement (); -                  -                 if(IpAddress! =NULL&& ipAddressinstanceofinet4address) { -SYSTEM.OUT.PRINTLN ("IP address:" + - ipaddress.gethostaddress ()); -                 } in             } -}Catch(SocketException e) { to e.printstacktrace (); +         } -          the         return true; *}//End Method Getipaddrbyname

Several methods of obtaining IP address in Java