我正在尝试开发一个系统，其中有不同的节点运行在不同的系统或在同一系统的不同端口上。
现在，所有节点都创建了一个套接字，将目标IP作为称为引导节点的特殊节点的IP。然后，节点创建自己的ServerSocket并开始侦听连接。
引导节点维护一个节点列表，并在查询时返回它们。
现在我需要的是节点必须将其IP注册到引导节点。我尝试使用cli.getInetAddress()一旦客户端连接到引导节点的ServerSocket，但这不起作用。
我需要客户端注册其PPP IP，如果可用;
否则，局域网IP(如果可用);
否则，它必须注册127.0.0.1，假设它是同一台计算机。
使用代码:
System.out.println(Inet4Address.getLocalHost().getHostAddress());
or
System.out.println(InetAddress.getLocalHost().getHostAddress());
我的PPP连接IP地址是:117.204.44.192，但上面返回我192.168.1.2
EDIT
我正在使用以下代码:
Enumeration e = NetworkInterface.getNetworkInterfaces();
while(e.hasMoreElements())
{
NetworkInterface n = (NetworkInterface) e.nextElement();
Enumeration ee = n.getInetAddresses();
while (ee.hasMoreElements())
{
InetAddress i = (InetAddress) ee.nextElement();
System.out.println(i.getHostAddress());
}
}
我能够获得所有网络接口相关的所有IP地址，但我如何区分它们?这是我得到的输出:
127.0.0.1
192.168.1.2
192.168.56.1
117.204.44.19
你的计算机可以有多个网络接口，每个网络接口有多个inetaddress。如果过滤掉任何本地地址，则提醒的地址是非本地地址，其中可以有一个、没有或多个。
不幸的是，Java中的网络API仍然使用(旧的)枚举而不是迭代器和流，我们可以通过将它们包装为流来进行对抗。所以我们要做的就是
所有网络接口及其地址的流，以及
过滤掉本地的
代码:
private Stream<InetAddress> getNonLocalIpAddresses() throws IOException {
return enumerationAsStream(NetworkInterface.getNetworkInterfaces())
.flatMap(networkInterface -> enumerationAsStream(networkInterface.getInetAddresses()))
.filter(inetAddress -> !inetAddress.isAnyLocalAddress())
.filter(inetAddress -> !inetAddress.isSiteLocalAddress())
.filter(inetAddress -> !inetAddress.isLoopbackAddress())
.filter(inetAddress -> !inetAddress.isLinkLocalAddress());
}
在我的机器上，这目前返回两个IPv6地址。
要获得这些inetaddress中的第一个:
private String getMyIp() throws IOException {
return getNonLocalIpAddresses()
.map(InetAddress::getHostAddress)
.findFirst()
.orElseThrow(NoSuchElementException::new);
}
将枚举包装为流的方法:
public static <T> Stream<T> enumerationAsStream(Enumeration<T> e) {
return StreamSupport.stream(
Spliterators.spliteratorUnknownSize(
new Iterator<>() {
public T next() { return e.nextElement(); }
public boolean hasNext() { return e.hasMoreElements(); }
}, Spliterator.ORDERED), false);
}
编辑1:更新后的代码，因为之前的链接，不再存在
import java.io.*;
import java.net.*;
public class GetMyIP {
public static void main(String[] args) {
URL url = null;
BufferedReader in = null;
String ipAddress = "";
try {
url = new URL("http://bot.whatismyipaddress.com");
in = new BufferedReader(new InputStreamReader(url.openStream()));
ipAddress = in.readLine().trim();
/* IF not connected to internet, then
* the above code will return one empty
* String, we can check it's length and
* if length is not greater than zero,
* then we can go for LAN IP or Local IP
* or PRIVATE IP
*/
if (!(ipAddress.length() > 0)) {
try {
InetAddress ip = InetAddress.getLocalHost();
System.out.println((ip.getHostAddress()).trim());
ipAddress = (ip.getHostAddress()).trim();
} catch(Exception exp) {
ipAddress = "ERROR";
}
}
} catch (Exception ex) {
// This try will give the Private IP of the Host.
try {
InetAddress ip = InetAddress.getLocalHost();
System.out.println((ip.getHostAddress()).trim());
ipAddress = (ip.getHostAddress()).trim();
} catch(Exception exp) {
ipAddress = "ERROR";
}
//ex.printStackTrace();
}
System.out.println("IP Address: " + ipAddress);
}
}
实际版本:这停止工作
希望这段代码可以帮助你实现这一点:
// Method to get the IP Address of the Host.
private String getIP()
{
// This try will give the Public IP Address of the Host.
try
{
URL url = new URL("http://automation.whatismyip.com/n09230945.asp");
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String ipAddress = new String();
ipAddress = (in.readLine()).trim();
/* IF not connected to internet, then
* the above code will return one empty
* String, we can check it's length and
* if length is not greater than zero,
* then we can go for LAN IP or Local IP
* or PRIVATE IP
*/
if (!(ipAddress.length() > 0))
{
try
{
InetAddress ip = InetAddress.getLocalHost();
System.out.println((ip.getHostAddress()).trim());
return ((ip.getHostAddress()).trim());
}
catch(Exception ex)
{
return "ERROR";
}
}
System.out.println("IP Address is : " + ipAddress);
return (ipAddress);
}
catch(Exception e)
{
// This try will give the Private IP of the Host.
try
{
InetAddress ip = InetAddress.getLocalHost();
System.out.println((ip.getHostAddress()).trim());
return ((ip.getHostAddress()).trim());
}
catch(Exception ex)
{
return "ERROR";
}
}
}
