如何通过Java的类库获取主机IP地址代码,Java代码库,德仔网

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【Java】如何通过Java的类库获取主机IP地址
作者:Dezai.CN / 发布于2011/12/1/ 747
<div> public class MyTest {
 public static void main(String[] args) {
 //1. 通过NetworkInterface类枚举出当前主机的全部网络设备数据
 try {
 //1.1 返回当前主机每一个网络接口对应的实例
 Enumeration<NetworkInterface> interfaceList = NetworkInterface.getNetworkInterfaces();
 if (interfaceList == null) {
 System.out.println("--No interfaces found--");
 } else {
 while (interfaceList.hasMoreElements()) {
 NetworkInterface iface = interfaceList.nextElement();
 //1.2 iface.getName()方法返回的是设备的名称，通常由字母和数字联合构成。
 System.out.println("Interface " + iface.getName() + ":");
 //1.3 枚举出真正持有IP地址信息的对象
 Enumeration<InetAddress> addrList = iface.getInetAddresses();
 if (!addrList.hasMoreElements())
 System.out.println("\t(No Addresses for this interface.");
 while (addrList.hasMoreElements()) {
 InetAddress addr = addrList.nextElement();
 //1.4 这里输出的就是我们通常所说的点分形式的IP地址，如192.163.1.1
 if (addr instanceof Inet4Address)
 System.out.println("\tAddress " + addr.getHostAddress());
 }
 }
 }
 } catch (SocketException e) {
 System.out.println("Error getting network interfaces: " + e.getMessage());
 }
 //2. 根据指定主机名(host)，获取该主机的全部网络设备信息。
 String host = "Stephen-PC";
 try {
 System.out.println(host + ":");
 //2.1 通过主机名称直接获取该主机的全部网络地址。
 InetAddress[] addrList = InetAddress.getAllByName(host);
 for (InetAddress addr : addrList) {
 //2.2 getHostName()获取的是主机名，getHostAddress()获取的是点分形式的IP地址。
 if (addr instanceof Inet4Address)
 System.out.println("\t" + addr.getHostName() + "/" + addr.getHostAddress());
 }
 } catch (UnknownHostException e) {
 System.out.println("\tUnable to find address for " + host);
 }
 }
 }
 /* 输出结果如下：
 Interface lo:
 Address 127.0.0.1
 Interface net0:
 (No Addresses for this interface.
 Interface net1:
 (No Addresses for this interface.
 Interface net2:
 (No Addresses for this interface.
 Interface net3:
 (No Addresses for this interface.
 Interface ppp0:
 (No Addresses for this interface.
 Interface eth0:
 (No Addresses for this interface.
 Interface eth1:
 (No Addresses for this interface.
 Interface eth2:
 (No Addresses for this interface.
 Interface ppp1:
 (No Addresses for this interface.
 Interface net4:
 (No Addresses for this interface.
 Interface eth3:
 Address 10.24.194.17
 Interface net5:
 (No Addresses for this interface.
 Interface net6:
 (No Addresses for this interface.
 Interface eth4:
 Interface net7:
 (No Addresses for this interface.
 Interface net8:
 (No Addresses for this interface.
 Interface eth5:
 Address 192.168.225.1
 Interface eth6:
 Address 192.168.220.1
 Interface eth7:
 (No Addresses for this interface.
 Interface eth8:
 (No Addresses for this interface.
 Interface eth9:
 (No Addresses for this interface.
 Interface eth10:
 (No Addresses for this interface.
 Interface eth11:
 (No Addresses for this interface.
 Stephen-PC:
 Stephen-PC/10.24.194.17
 Stephen-PC/192.168.225.1
 Stephen-PC/192.168.220.1 
 */</div>
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