JAVA如何获得外网IP地址

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;

}

}

}

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>

import javanet;

public class Test6 {

public static void main(String[] args) {

// TODO Auto-generated method stub

InetAddress ia=null;

try {

ia=iagetLocalHost();

String localname=iagetHostName();

String localip=iagetHostAddress();

Systemoutprintln("本机名称是："+ localname);

Systemoutprintln("本机的ip是 ："+localip);

} catch (Exception e) {

// TODO Auto-generated catch block

eprintStackTrace();

}

}

}

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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