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Java获取ip地址的几种方法
以下内容介绍下java获取ip地址的几种思路。
１、直接利用java.net.InetAddress类获取，不过这种方法只在windows环境下有效，在linux环境下只能获取localhost地址（即/etc/hosts文件内容）
代码如下：
1 import java.net.InetAddress; 2 3 /** 4 * This method works well in windows system. 5 * In Linux system it returns 127.0.0.1 the content of the hosts file. 6 */ 7 public static void getIpAddressInWindows() { 8 try { 9 InetAddress address = InetAddress.getLocalHost();10 System.out.println("Host Name: " + address.getHostName());11 System.out.println("Host Address: " + address.getHostAddress());12 13 } catch (UnknownHostException e) {14 e.printStackTrace();15 }16 }
２、可以在linux下正常工作的方法，代码如下：
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 to get all ip addresses from the network interfaces. * network interfaces: eth0, wlan0, l0, vmnet1, vmnet8 */ public static void getAllIpAddress() { try { //get all network interface Enumeration<NetworkInterface> allNetworkInterfaces = NetworkInterface.getNetworkInterfaces(); NetworkInterface networkInterface = null; //check if there are more than one network interface while (allNetworkInterfaces.hasMoreElements()) { //get next network interface networkInterface = allNetworkInterfaces.nextElement(); //output interface‘s name System.out.println("network interface: " + networkInterface.getDisplayName()); //get all ip address that bound to this network interface Enumeration<InetAddress> allInetAddress = networkInterface.getInetAddresses(); InetAddress ipAddress = null; //check if there are more than one ip addresses //band to one network interface while (allInetAddress.hasMoreElements()) { //get next ip address ipAddress = allInetAddress.nextElement(); if (ipAddress != null && ipAddress instanceof Inet4Address) { System.out.println("ip address: " + ipAddress.getHostAddress()); } } } } catch (SocketException e) { e.printStackTrace(); } }//end method getAllIpAddress
上边这种方法有些不足之处，它会输出所有的网卡上的ip地址，有时候我们只需一个或几个单独的网卡ip即可，可以通过如下方法获得：
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 is used to get ip address by network interface‘s name. 3 * @param networkInterfaceName network interface‘s name 4 * @return return true if get ip address successfully, 5 * otherwise return false. 6 */ 7 public static boolean getIpAddrByName(String networkInterfaceName) { 8 try { 9 //get network interface by name10 NetworkInterface networkInterface = 11 NetworkInterface.getByName(networkInterfaceName);12 if (networkInterface == null) {13 return false;14 }15 System.out.println("network interface: " + 16 networkInterface.getDisplayName());17 18 InetAddress ipAddress = null;19 //get all ip addresses band to this interface20 Enumeration<InetAddress> addresses = networkInterface.getInetAddresses();21 22 while (addresses.hasMoreElements()) {23 ipAddress = addresses.nextElement();24 25 if (ipAddress != null && ipAddress instanceof Inet4Address) {26 System.out.println("ip address: " + 27 ipAddress.getHostAddress());28 }29 }30 } catch (SocketException e) {31 e.printStackTrace();32 }33 34 return true;35 }// end method getIpAddrByName
Java获取ip地址的几种方法
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