问题
我的 Windows 系统有多个以太网适配器。给定以太网适配器的名称，我需要找到它的 IP 地址。
例如，ipconfig我的系统命令的输出是：
Ethernet adapter GB1:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 0.0.0.0
Subnet Mask . . . . . . . . . . . : 0.0.0.0
Default Gateway . . . . . . . . . :
Ethernet adapter SWITCH:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 10.200.1.11
Subnet Mask . . . . . . . . . . . : 255.255.255.0
IP Address. . . . . . . . . . . . : 10.200.1.51
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
Ethernet adapter LAN:
Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 10.1.2.62
Subnet Mask . . . . . . . . . . . : 255.255.254.0
IP Address. . . . . . . . . . . . : 10.1.2.151
Subnet Mask . . . . . . . . . . . : 255.255.254.0
Default Gateway . . . . . . . . . : 10.1.2.1
注意：我不需要担心无线适配器或任何其他类型的适配器。我只需要为以太网适配器执行此操作。
对于这个系统，我需要编写一个行为如下所示的 Java 类：
C:>java NameToIp GB1
0.0.0.0
C:>java NameToIp SWITCH
10.200.1.11
10.200.1.51
C:>java NameToIp LAN
10.1.2.62
10.1.2.151
什么不起作用
使用java.net.NetworkInterface没有帮助。它的getName()和getDisplayName()方法不会打印适配器连接名称，因为它出现在ipconfigWindows 网络连接的输出中或中。他们改为打印实际的设备名称。例如，考虑以下代码：
import java.util.Enumeration;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
public class ListInterfaces
{
public static void main(String[] args) throws SocketException, UnknownHostException {
Enumeration<NetworkInterface> nwInterfaces = NetworkInterface.getNetworkInterfaces();
while (nwInterfaces.hasMoreElements()) {
NetworkInterface nwInterface = nwInterfaces.nextElement();
System.out.print(nwInterface.getName() + ": " +
nwInterface.getDisplayName());
Enumeration<InetAddress> addresses = nwInterface.getInetAddresses();
while (addresses.hasMoreElements()) {
InetAddress address = addresses.nextElement();
System.out.print(" - " + address.getHostAddress());
}
System.out.println();
}
}
}
这将打印以下输出：
C:>java ListInterfaces
lo: MS TCP Loopback interface - 127.0.0.1
eth0: Broadcom BCM5709C NetXtreme II GigE (NDIS VBD Client) #
eth1: Broadcom BCM5709C NetXtreme II GigE (NDIS VBD Client) #2 - 10.200.1.11 - 10.200.1.51
eth2: Broadcom BCM5709C NetXtreme II GigE (NDIS VBD Client) #3 - 10.1.2.62 - 10.1.2.151
一个有效的丑陋黑客
我编写了一个丑陋的 hack，它从ipconfig. 这是代码。
import java.util.ArrayList;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;
import java.io.IOException;
public class NameToIp
{
public static ArrayList<String> getIP(String adapterName)
throws IOException, InterruptedException
{
// Run the Windows 'ipconfig' command and get its stdout
ProcessBuilder cmdBuilder = new ProcessBuilder("ipconfig");
Process process = cmdBuilder.start();
BufferedReader stdout = new BufferedReader(
new InputStreamReader(process.getInputStream()));
// Find the section for the specified adapter
String line;
boolean foundAdapter = false;
while ((line = stdout.readLine()) != null) {
line = line.trim();
if (line.equals("Ethernet adapter " + adapterName + ':')) {
foundAdapter = true;
break;
}
}
if (!foundAdapter) {
process.waitFor();
throw new IOException("Adapter not found");
}
// Find IP addresses in the found section
ArrayList<String> ips = new ArrayList<String>();
while ((line = stdout.readLine()) != null) {
// Stop parsing if we reach the beginning of the next
// adapter section in the output of ifconfig
if (line.length() > 0 && line.charAt(0) != ' ') {
break;
}
line = line.trim();
// Extract IP addresses
if (line.startsWith("IP Address.") ||
line.startsWith("IPv4 Address.")) {
int colonIndex;
if ((colonIndex = line.indexOf(':')) != 1) {
ips.add(line.substring(colonIndex + 2));
}
}
}
process.waitFor();
return ips;
}
public static void main(String[] args)
throws IOException, InterruptedException
{
// Print help message if adapter name has not been specified
if (args.length != 1) {
StackTraceElement[] stack = Thread.currentThread().getStackTrace();
String prog = stack[stack.length - 1].getClassName();
System.err.println("Usage: java " + prog + " ADAPTERNAME");
System.err.println("Examples:");
System.err.println(" java " + prog +" \"Local Area Connection\"");
System.err.println(" java " + prog +" LAN");
System.err.println(" java " + prog +" SWITCH");
System.exit(1);
}
ArrayList<String> ips = getIP(args[0]);
for (String ip: ips) {
System.out.println(ip);
}
}
}
问题
有没有更好的方法来解决这个问题？