如何从Java中枚举所有启用的NIC卡的IP地址？

短的parsingipconfig的输出，没有人有这样做的100％纯java的方式？

Answer 1

这很简单：

 try { InetAddress localhost = InetAddress.getLocalHost(); LOG.info(" IP Addr: " + localhost.getHostAddress()); // Just in case this host has multiple IP addresses.... InetAddress[] allMyIps = InetAddress.getAllByName(localhost.getCanonicalHostName()); if (allMyIps != null && allMyIps.length > 1) { LOG.info(" Full list of IP addresses:"); for (int i = 0; i < allMyIps.length; i++) { LOG.info(" " + allMyIps[i]); } } } catch (UnknownHostException e) { LOG.info(" (error retrieving server host name)"); } try { LOG.info("Full list of Network Interfaces:"); for (Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) { NetworkInterface intf = en.nextElement(); LOG.info(" " + intf.getName() + " " + intf.getDisplayName()); for (Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements(); ) { LOG.info(" " + enumIpAddr.nextElement().toString()); } } } catch (SocketException e) { LOG.info(" (error retrieving network interface list)"); } 

Answer 2

其中一些只能在JDK 1.6及更高版本中使用（在该版本中添加了其中一种方法）。

 List<InetAddress> addrList = new ArrayList<InetAddress>(); for(NetworkInterface ifc : NetworkInterface.getNetworkInterfaces()) { if(ifc.isUp()) { for(InetAddress addr : ifc.getInetAddresses()) { addrList.add(addr); } } } 

在1.6之前，这有点困难 – 直到那时isUp（）才被支持。

FWIW： Javadocs指出，这是获取节点的所有IP地址的正确方法：

注意：可以使用getNetworkInterfaces（）+ getInetAddresses（）获取此节点的所有IP地址

Answer 3

由于添加了InterfaceAddress代码，此代码仅在Java 1.6中可用。

  try { System.out.println("Output of Network Interrogation:"); System.out.println("********************************\n"); InetAddress theLocalhost = InetAddress.getLocalHost(); System.out.println(" LOCALHOST INFO"); if(theLocalhost != null) { System.out.println(" host: " + theLocalhost.getHostName()); System.out.println(" class: " + theLocalhost.getClass().getSimpleName()); System.out.println(" ip: " + theLocalhost.getHostAddress()); System.out.println(" chost: " + theLocalhost.getCanonicalHostName()); System.out.println(" byteaddr: " + toMACAddrString(theLocalhost.getAddress())); System.out.println(" sitelocal?: " + theLocalhost.isSiteLocalAddress()); System.out.println(""); } else { System.out.println(" localhost was null"); } Enumeration<NetworkInterface> theIntfList = NetworkInterface.getNetworkInterfaces(); List<InterfaceAddress> theAddrList = null; NetworkInterface theIntf = null; InetAddress theAddr = null; while(theIntfList.hasMoreElements()) { theIntf = theIntfList.nextElement(); System.out.println("--------------------"); System.out.println(" " + theIntf.getDisplayName()); System.out.println(" name: " + theIntf.getName()); System.out.println(" mac: " + toMACAddrString(theIntf.getHardwareAddress())); System.out.println(" mtu: " + theIntf.getMTU()); System.out.println(" mcast?: " + theIntf.supportsMulticast()); System.out.println(" loopback?: " + theIntf.isLoopback()); System.out.println(" ptp?: " + theIntf.isPointToPoint()); System.out.println(" virtual?: " + theIntf.isVirtual()); System.out.println(" up?: " + theIntf.isUp()); theAddrList = theIntf.getInterfaceAddresses(); System.out.println(" int addrs: " + theAddrList.size() + " total."); int addrindex = 0; for(InterfaceAddress intAddr : theAddrList) { addrindex++; theAddr = intAddr.getAddress(); System.out.println(" " + addrindex + ")."); System.out.println(" host: " + theAddr.getHostName()); System.out.println(" class: " + theAddr.getClass().getSimpleName()); System.out.println(" ip: " + theAddr.getHostAddress() + "/" + intAddr.getNetworkPrefixLength()); System.out.println(" bcast: " + intAddr.getBroadcast().getHostAddress()); int maskInt = Integer.MIN_VALUE >> (intAddr.getNetworkPrefixLength()-1); System.out.println(" mask: " + toIPAddrString(maskInt)); System.out.println(" chost: " + theAddr.getCanonicalHostName()); System.out.println(" byteaddr: " + toMACAddrString(theAddr.getAddress())); System.out.println(" sitelocal?: " + theAddr.isSiteLocalAddress()); System.out.println(""); } } } catch (SocketException e) { e.printStackTrace(); } catch (UnknownHostException e) { e.printStackTrace(); } 

“toMACAddrString”方法如下所示：

 public static String toMACAddrString(byte[] a) { if (a == null) { return "null"; } int iMax = a.length - 1; if (iMax == -1) { return "[]"; } StringBuilder b = new StringBuilder(); b.append('['); for (int i = 0;; i++) { b.append(String.format("%1$02x", a[i])); if (i == iMax) { return b.append(']').toString(); } b.append(":"); } } 

和“toIPAddrString”方法在这里：

 public static String toIPAddrString(int ipa) { StringBuilder b = new StringBuilder(); b.append(Integer.toString(0x000000ff & (ipa >> 24))); b.append("."); b.append(Integer.toString(0x000000ff & (ipa >> 16))); b.append("."); b.append(Integer.toString(0x000000ff & (ipa >> 8))); b.append("."); b.append(Integer.toString(0x000000ff & (ipa))); return b.toString(); } 

我在上面的try / catch中的第一组代码中，名为IPConfig的类中名为dump（）的方法。 然后我只是在IPConfig中调用一个主要的方法来调用新的IPConfig（）.dump（），以便当我试图找出一些古怪的networking问题时，我可以看到Java认为正在进行。 我发现我的Fedora盒子对于LocalHost信息报告的信息不同于Windows，并且导致我的Java程序出现了一些问题。

我意识到它与其他答案类似，但它打印出几乎所有有趣的东西，你可以从接口和ipaddress apis获得。

Answer 4

更新以解决Jared对JDK 1.7的回答。

 // Get list of IP addresses from all local network interfaces. (JDK1.7) // ----------------------------------------------------------- public List<InetAddress> getListOfIPsFromNIs(){ List<InetAddress> addrList = new ArrayList<InetAddress>(); Enumeration<NetworkInterface> enumNI = NetworkInterface.getNetworkInterfaces(); while ( enumNI.hasMoreElements() ){ NetworkInterface ifc = enumNI.nextElement(); if( ifc.isUp() ){ Enumeration<InetAddress> enumAdds = ifc.getInetAddresses(); while ( enumAdds.hasMoreElements() ){ InetAddress addr = enumAdds.nextElement(); addrList.add(addr); System.out.println(addr.getHostAddress()); //<---print IP } } } return addrList; } 

正如Sam Skuce强调的那样：

这在JDK 1.7中不能编译。 getNetworkInterfaces返回一个不能实现Iterable的Enumeration。 – 山姆·斯科瑟7月11 '12在19:58

输出示例：

 fe80:0:0:0:800:aaaa:aaaa:0%8 192.168.56.1 fe80:0:0:0:227:aaa:aaaa:6b5%2 123.123.123.123 0:0:0:0:0:0:0:1%1 127.0.0.1 

Answer 5

 import java.net.*; import java.util.*; public class NIC { public static void main(String args[]) throws Exception { List<InetAddress> addrList = new ArrayList<InetAddress>(); Enumeration<NetworkInterface> interfaces = null; try { interfaces = NetworkInterface.getNetworkInterfaces(); } catch (SocketException e) { e.printStackTrace(); } InetAddress localhost = null; try { localhost = InetAddress.getByName("127.0.0.1"); } catch (UnknownHostException e) { e.printStackTrace(); } while (interfaces.hasMoreElements()) { NetworkInterface ifc = interfaces.nextElement(); Enumeration<InetAddress> addressesOfAnInterface = ifc.getInetAddresses(); while (addressesOfAnInterface.hasMoreElements()) { InetAddress address = addressesOfAnInterface.nextElement(); if (!address.equals(localhost) && !address.toString().contains(":")) { addrList.add(address); System.out.println("FOUND ADDRESS ON NIC: " + address.getHostAddress()); } } } } }