java如何获取当前登录ip

为适应不同的网络情况，提供这个类：看下面的代码吧，Copy过去就能用。
import javaxservlet>

《java》中提取本地IP的方法如下：

private static void getIpAddressByNetworkInterface() {

try {

Enumeration<NetworkInterface> nets = NetworkInterfacegetNetworkInterfaces();  

NetworkInterface net;

InetAddress inetAddress;

while (netshasMoreElements()) {

net = netsnextElement();

Enumeration<InetAddress> address = netgetInetAddresses();

while (addresshasMoreElements()) {

inetAddress = addressnextElement();

if (inetAddress!=null&&inetAddress instanceof Inet4Address)

Systemoutprintln(inetAddressgetHostAddress());

}

}

} catch (SocketException e) {

// TODO Auto-generated catch block

eprintStackTrace();

}

}

import javanetInetAddress;
import javautilEnumeration;
import javanetNetworkInterface;
import javautil;
public class ipdisplay {
/
@param args
@throws Exception
/
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
String allipaddress;
ArrayList ar = new ArrayList();
Enumeration netInterfaces = NetworkInterfacegetNetworkInterfaces();
while (netInterfaceshasMoreElements()) {
NetworkInterface ni = (NetworkInterface) netInterfacesnextElement();

Enumeration cardipaddress = nigetInetAddresses();
InetAddress ip = (InetAddress) cardipaddressnextElement();
if(!ipgetHostAddress()equalsIgnoreCase("127001") )
{ aradd(nigetName()+":");
allipaddress=ipgetHostAddress();
while(cardipaddresshasMoreElements())
{
ip = (InetAddress) cardipaddressnextElement();
allipaddress=allipaddress+" , "+ipgetHostAddress();

}
aradd(allipaddress);

}
else
continue;
}
for(int i=0;i<arsize();)
{
Systemoutprintln(arget(i++));
}

}
}

java获取本机的外网ip示例：
import javaioIOException;
import javaioInputStream;
import javanet>java获取外网ip地址方法：
public class Main {
public static void main(String[] args) throws SocketException {
Systemoutprintln(MaingetRealIp());
}

public static String getRealIp() throws SocketException {
String localip = null;// 本地IP，如果没有配置外网IP则返回它
String netip = null;// 外网IP

Enumeration<NetworkInterface> netInterfaces =
NetworkInterfacegetNetworkInterfaces();
InetAddress ip = null;
boolean finded = false;// 是否找到外网IP
while (netInterfaceshasMoreElements() && !finded) {
NetworkInterface ni = netInterfacesnextElement();
Enumeration<InetAddress> address = nigetInetAddresses();
while (addresshasMoreElements()) {
ip = addressnextElement();
if (!ipisSiteLocalAddress()
&& !ipisLoopbackAddress()
&& ipgetHostAddress()indexOf(":") == -1) {// 外网IP
netip = ipgetHostAddress();
finded = true;
break;
} else if (ipisSiteLocalAddress()
&& !ipisLoopbackAddress()
&& ipgetHostAddress()indexOf(":") == -1) {// 内网IP
localip = ipgetHostAddress();
}
}
}

if (netip != null && !""equals(netip)) {
return netip;
} else {
return localip;
}
}
}

   Java中可以使用程序来获取本地ip地址和mac地址，使用InetAddress这个工具类，示例如下：

import javanet;
public class NetInfo {
 public static void main(String[] args) {
    new NetInfo()say();
    }
 public void say() {
   try {
   InetAddress i = InetAddressgetLocalHost();
   Systemoutprintln(i);                  //计算机名称和IP
   Systemoutprintln(igetHostName());    //名称
   Systemoutprintln(igetHostAddress()); //只获得IP
   }
   catch(Exception e){eprintStackTrace();}
 }
}

    也可以通过命令行窗口来查看本地ip和mac地址，输入命令：ipconfig。

public static void main(String[] args) { try { // 获取计算机名 String name = InetAddressgetLocalHost()getHostName(); // 获取IP地址 String ip = InetAddressgetLocalHost()getHostAddress(); Systemoutprintln("计算机名："+name); Systemoutprintln("IP地址："+ip); } catch (UnknownHostException e) { Systemoutprintln("异常：" + e); eprintStackTrace(); } }
是否可以解决您的问题？

方法如下：
方法一，使用CMD命令：
public static String getLocalIPForCMD(){
StringBuilder sb = new StringBuilder();
String command = "cmdexe /c ipconfig | findstr IPv4";
try {
Process p = RuntimegetRuntime()exec(command);
BufferedReader br = new BufferedReader(new InputStreamReader(pgetInputStream()));
String line = null;
while((line = brreadLine()) != null){
line = linesubstring(linelastIndexOf(":")+2,linelength());
sbappend(line);
}
brclose();
pdestroy();
} catch (IOException e) {
eprintStackTrace();
}
return sbtoString();
}
方法二，使用Java方法：
public static String getLocalIPForJava(){
StringBuilder sb = new StringBuilder();
try {
Enumeration<NetworkInterface> en = NetworkInterfacegetNetworkInterfaces();
while (enhasMoreElements()) {
NetworkInterface intf = (NetworkInterface) ennextElement();
Enumeration<InetAddress> enumIpAddr = intfgetInetAddresses();
while (enumIpAddrhasMoreElements()) {
InetAddress inetAddress = (InetAddress) enumIpAddrnextElement();
if (!inetAddressisLoopbackAddress() && !inetAddressisLinkLocalAddress()
&& inetAddressisSiteLocalAddress()) {
sbappend(inetAddressgetHostAddress()toString()+"\n");
}
}
}
} catch (SocketException e) { }
return sbtoString();
}

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