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Java获取ip地址的几种方法
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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());
1213 } 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 interfacewhile (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 interfacewhile (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 name
10 NetworkInterface networkInterface =
11 NetworkInterface.getByName(networkInterfaceName);
12if (networkInterface == null) {
13returnfalse;
14 }
15 System.out.println("network interface: " +
16 networkInterface.getDisplayName());
1718 InetAddress ipAddress = null;
19//get all ip addresses band to this interface20 Enumeration<InetAddress> addresses = networkInterface.getInetAddresses();
2122while (addresses.hasMoreElements()) {
23 ipAddress = addresses.nextElement();
2425if (ipAddress != null && ipAddress instanceof Inet4Address) {
26 System.out.println("ip address: " +
27 ipAddress.getHostAddress());
28 }
29 }
30 } catch (SocketException e) {
31 e.printStackTrace();
32 }
3334returntrue;
35 }// end method getIpAddrByName
原文：http://www.cnblogs.com/blog-zuo/p/4067018.html
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