使用Java的IP地址

Question

我如何获得用户的IP地址？

InetAddress ip;
try {

 ip = InetAddress.getLocalHost();
 System.out.println("Current IP address : " + ip.getHostAddress());

} catch (UnknownHostException e) {

e.printStackTrace();

 }

返回:127.0.0.1

我知道那不是我的IP.这是我的本地IP地址.如何使用java获取用户IP ..？

Answer 1

最短的方法是:

try {
InetAddress thisIp =InetAddress.getLocalHost();
System.out.println("IP:"+thisIp.getHostAddress());
}
catch(Exception e) {
e.printStackTrace();
}

然而, getLocalHost文档说:

如果有安全管理器,则使用本地主机名调用其checkConnect方法,并将-1作为其参数,以查看是否允许该操作.如果不允许该操作,则返回表示环回地址的InetAddress.

并且在某些情况下InetAddress.getLocalHost()不咨询您的接口,它只返回常量127.0.0.1(对于IPv4))

我认为NetworkInterface.getNetworkInterfaces你需要列举所有可能性.这是一个不显示虚拟地址的示例,但适用于"主要"接口:

import java.net.*;
import java.util.*;

public class Test
{
    public static void main(String[] args)
        throws Exception // Just for simplicity
    {
        for (Enumeration<NetworkInterface> ifaces = 
               NetworkInterface.getNetworkInterfaces();
             ifaces.hasMoreElements(); )
        {
            NetworkInterface iface = ifaces.nextElement();
            System.out.println(iface.getName() + ":");
            for (Enumeration<InetAddress> addresses =
                   iface.getInetAddresses();
                 addresses.hasMoreElements(); )
            {
                InetAddress address = addresses.nextElement();
                System.out.println("  " + address);
            }
        }
    }
}

或者:

尝试使用此功能(首先输出应该是PC名称后的IP):

    InetAddress[] localaddr;

    String computername = null;

    try {
        computername = InetAddress.getLocalHost().getHostName();//get pc name
    } catch (UnknownHostException ex) {
        ex.printStackTrace();
    }

    System.out.println(computername);

    try {
        localaddr = InetAddress.getAllByName(computername);
        for (int i = 0; i < localaddr.length; i++) {
            System.out.println("\n" + localaddr[i].getHostAddress());
        }
    } catch (UnknownHostException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

参考文献:

• IP地址未在java中获取
• http://www.roseindia.net/java/java-get-example/get-ip-address.shtml