About Java getting the local server IP issues

Java gets the local server IP, our simplest notation:

Import java.net.InetAddress;  public class catchip{public static void Main (string[] args)    {        try        {            //Get IP address            String IP = inetaddres S.getlocalhost (). gethostaddress ();                   SYSTEM.OUT.PRINTLN ("IP address:" +IP);        }        catch (Exception e)        {            System.out.println ("exception:" + E);            E.printstacktrace ();}}}    

But there's a problem with that we're in the Windows system and we can get the right IP

But on Linux, the IP address that may be obtained is: 127.0.0.1

And in the production system, a server may have a number of network cards, so that the IP is more troublesome, specifically to understand the production system server IP address we can refer to this URL:

Http://blog.163.com/[email protected]/blog/static/3259410020117493943770/?suggestedreading

The

Code is as follows:

/* To change this template, choose Tools | Templates * and open the template in the editor. */package org.lib.com;/** * * @author Administrator */import java.io.bufferedreader;import java.io.ioexception;import Java.io.inputstreamreader;import Java.net.inet6address;import Java.net.inetaddress;import Java.net.networkinterface;import Java.net.socketexception;import Java.net.unknownhostexception;import     Java.util.arraylist;import Java.util.enumeration;import java.util.List;        public class Testaddr {/** * get native all IP */private static string[] Getalllocalhostip () {        list<string> res = new arraylist<string> ();        Enumeration netinterfaces;            try {netinterfaces = networkinterface.getnetworkinterfaces ();            inetaddress IP = null;                        while (Netinterfaces.hasmoreelements ()) {NetworkInterface ni = (networkinterface) netinterfaces                . Nextelement (); System.out.pRINTLN ("---Name---:" + ni.getname ());                Enumeration nii = Ni.getinetaddresses ();                    while (Nii.hasmoreelements ()) {IP = (inetaddress) nii.nextelement ();                        if (Ip.gethostaddress (). IndexOf (":") = =-1) {Res.add (ip.gethostaddress ());                    System.out.println ("ip= of this Machine" + ip.gethostaddress ());            }}}} catch (SocketException e) {e.printstacktrace ();        } return (string[]) Res.toarray (new string[0]);           } public static string Getlocalip () {String ip = "";                   try {enumeration<?> e1 = (enumeration<?>) networkinterface.getnetworkinterfaces ();                         while (E1.hasmoreelements ()) {NetworkInterface ni = (networkinterface) e1.nextelement (); System.out.println ("Getlocalip--nic.getdisplayname ():" + Ni.getdisPlayname ());                       System.out.println ("Getlocalip--nic.getname ():" + ni.getname ());                       if (!ni.getname (). Equals ("eth0")) {continue;                           } else {enumeration<?> e2 = ni.getinetaddresses ();                           while (E2.hasmoreelements ()) {inetaddress ia = (inetaddress) e2.nextelement ();                           if (IA instanceof inet6address) continue;                       ip = ia.gethostaddress ();                       } break;                   }}} catch (SocketException e) {e.printstacktrace ();               System.exit (-1);           } return IP;                 } public static string Getwinlocalip () {String ip = "";                    try { Enumeration <?> e1 = (enumeration <?>) networkinterface.getnetworkinterfaces (); while (E1.hasmoreelements ()) {NetworkInterface ni = (networkinterface) e1.ne                        Xtelement ();                         System.out.println ("Getwinlocalip--nic.getdisplayname ():" + ni.getdisplayname ());                        System.out.println ("Getwinlocalip--nic.getname ():" + ni.getname ());                         Enumeration <?> e2 = Ni.getinetaddresses (); while (E2.hasmoreelements ()) {inetaddress ia = (inetaddress) e2.next                             Element ();                     ip = ia.gethostaddress ();                     }}} catch (SocketException e) {                 E.printstacktrace ();                 System.exit (-1);             } return IP;    }    /** * Get native all Physical Address * * @return */public static String getmacaddress () {S        Tring mac = "";         String line = "";       String OS = System.getproperty ("Os.name"); if (OS! = null && os.startswith ("Windows")) {try {String command = "cmd.exe/c IPC                    Onfig/all ";                         Process p = runtime.getruntime (). exec (command);                         BufferedReader br = new BufferedReader (new InputStreamReader (p. getInputStream ()));  while (line = Br.readline ()) = null) {if (Line.indexof ("Physical Address") > 0)                                 {int index = Line.indexof (":") + 2;                                 Mac = line.substring (index);                        Break                     }} br.close ();  } catch (IOException e) {}          } return Mac;            } public string Getmacaddress (string host) {string mac = "";                 StringBuffer sb = new StringBuffer (); try {networkinterface ni = networkinterface.getbyinetaddress (inetaddress. getbyname                     (host));                     byte[] Macs = ni.gethardwareaddress ();                for (int i = 0; i < macs.length; i++) {//Mac = Integer.tohexstring (Macs[i] & 0xFF);                if (mac.length () = = 1) {//Mac = ' 0 ' + mac;                }////Sb.append (Mac + "-");            }} catch (SocketException e) {e.printstacktrace ();            } catch (Unknownhostexception e) {e.printstacktrace ();            } mac = Sb.tostring ();                 Mac = mac.substring (0, Mac.length ()-1); ReTurn Mac; }/** * @param args */public static void main (string[] args) {Testaddr.get            Alllocalhostip ();            System.out.println ("Localip:" +testaddr.getlocalip ());            System.out.println ("Getwinlocalip:" +testaddr.getwinlocalip ());        System.out.println (Testaddr.getmacaddress ()); }         }

Of course, we often have a lazy approach, that is to get the server hostname, that is, the hostname, the wording is more unified simple:

Import java.net.InetAddress;  public class catchhostname{public static void Main (string[] args)    {        try        {            //Get computer name            String name = in Etaddress.getlocalhost (). GetHostName ();            SYSTEM.OUT.PRINTLN ("Computer name:" +name);                 }        catch (Exception e)        {            System.out.println ("exception:" + E);            E.printstacktrace ();}}}    

About Java getting the local server IP issues