「获取公网ipjava」获取公网ip地址的方法
本篇文章给大家谈谈获取公网ipjava，以及获取公网ip地址的方法对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。
本文目录一览：
- 1、JAVA如何获得外网IP地址？
- 2、java如何获取公网ip，有通过路由
- 3、在java中如何获取电脑的公网IP地址，不是192.168.0.**这种！！
- 4、java中如何获取到本机的外网ip地址?
- 5、JAVA获取外网IP
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 {
System.out.println(Main.getRealIp());
}
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
EnumerationNetworkInterface netInterfaces =
NetworkInterface.getNetworkInterfaces();
InetAddress ip = null;
boolean finded = false;// 是否找到外网IP
while (netInterfaces.hasMoreElements() !finded) {
NetworkInterface ni = netInterfaces.nextElement();
EnumerationInetAddress address = ni.getInetAddresses();
while (address.hasMoreElements()) {
ip = address.nextElement();
if (!ip.isSiteLocalAddress()
!ip.isLoopbackAddress()
ip.getHostAddress().indexOf(":") == -1) {// 外网IP
netip = ip.getHostAddress();
finded = true;
break;
} else if (ip.isSiteLocalAddress()
!ip.isLoopbackAddress()
ip.getHostAddress().indexOf(":") == -1) {// 内网IP
localip = ip.getHostAddress();
}
}
}
if (netip != null !"".equals(netip)) {
return netip;
} else {
return localip;
}
}
}
java如何获取公网ip，有通过路由
如果要通过路由器，不同的路由器的获取方法不一样。通用的做法是通过 HttpClient 在百度上搜索关键字 ip, 然后提取出公网ip。
代码如下：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class App {
// 获取网页源码
static String httpGet(String url) {
StringBuffer buffer = new StringBuffer();
try {
URLConnection conn = new URL(url).openConnection();
conn.addRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36");
try (InputStream inputStream = conn.getInputStream();
InputStreamReader streamReader = new InputStreamReader(inputStream);
BufferedReader reader = new BufferedReader(streamReader);) {
String line = null;
while ((line = reader.readLine()) != null) {
buffer.append(line).append(System.lineSeparator());
}
}
} catch (IOException e) {
e.printStackTrace();
}
return buffer.toString();
}
public static void main(String[] args) {
String html = httpGet("");
// 提出IP
Pattern pattern = Pattern.compile("span\\sclass=\"c-gap-right\"本机IP:nbsp;([^]+)/span");
Matcher matcher = pattern.matcher(html);
if (matcher.find()) {
String ip = matcher.group(1);
System.out.println(ip);
}
}
}
在java中如何获取电脑的公网IP地址，不是192.168.0.**这种！！
在NetworkInterface 里面有一个方法getNetworkInterfaces()可以获得全部IP 这个类没有constructor.不过getNetworkInterfaces()是static修饰 可以直接用
java中如何获取到本机的外网ip地址?
java获取本机的外网ip示例：
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* 获取本机外网IP地址
* 思想是访问网站，得到返回的文本后解析出本机在外网的IP地址
* @author pieryon
*
*/
public class ExternalIpAddressFetcher {
// 外网IP提供者的网址
private String externalIpProviderUrl;
// 本机外网IP地址
private String myExternalIpAddress;
public ExternalIpAddressFetcher(String externalIpProviderUrl) {
this.externalIpProviderUrl = externalIpProviderUrl;
String returnedhtml = fetchExternalIpProviderHTML(externalIpProviderUrl);
parse(returnedhtml);
}
/**
* 从外网提供者处获得包含本机外网地址的字符串
* 从返回的字符串如下
* htmlheadtitleCurrent IP Check/title/headbodyCurrent IP Address: 123.147.226.222/body/html
* @param externalIpProviderUrl
* @return
*/
private String fetchExternalIpProviderHTML(String externalIpProviderUrl) {
// 输入流
InputStream in = null;
// 到外网提供者的Http连接
HttpURLConnection httpConn = null;
try {
// 打开连接
URL url = new URL(externalIpProviderUrl);
httpConn = (HttpURLConnection) url.openConnection();
// 连接设置
HttpURLConnection.setFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.setRequestProperty("User-Agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)");
// 获取连接的输入流
in = httpConn.getInputStream();
byte[] bytes=new byte[1024];// 此大小可根据实际情况调整
// 读取到数组中
int offset = 0;
int numRead = 0;
while (offset bytes.length
(numRead=in.read(bytes, offset, bytes.length-offset)) = 0) {
offset += numRead;
}
// 将字节转化为为UTF-8的字符串
String receivedString=new String(bytes,"UTF-8");
// 返回
return receivedString;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
in.close();
httpConn.disconnect();
} catch (Exception ex) {
ex.printStackTrace();
}
}
// 出现异常则返回空
return null;
}
/**
* 使用正则表达式解析返回的HTML文本,得到本机外网地址
* @param html
*/
private void parse(String html){
Pattern pattern=Pattern.compile("(\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})", Pattern.CASE_INSENSITIVE);
Matcher matcher=pattern.matcher(html);
while(matcher.find()){
myExternalIpAddress=matcher.group(0);
}
}
/**
* 得到本机外网地址,得不到则为空
* @return
*/
public String getMyExternalIpAddress() {
return myExternalIpAddress;
}
public static void main(String[] args){
ExternalIpAddressFetcher fetcher=new ExternalIpAddressFetcher("");
System.out.println(fetcher.getMyExternalIpAddress());
}
}
JAVA获取外网IP
请参考以下代码，可以获得任意给定网卡的ip地址：
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.Enumeration;
public class InternetTest {
public static void main(String[] args) {
String netCard = "lo";
try {
EnumerationNetworkInterface netInterfaces = NetworkInterface
.getNetworkInterfaces();
if (netInterfaces.hasMoreElements()) {
NetworkInterface netInterface = netInterfaces.nextElement();
if (netCard.equals(netInterface.getName())) {
// 子接口，linux下会取到父接口？？
EnumerationNetworkInterface subnetInterfaces = netInterface
.getSubInterfaces();
while (subnetInterfaces.hasMoreElements()) {
NetworkInterface subnetInterface = subnetInterfaces
.nextElement();
System.out.println(subnetInterface.getName());
EnumerationInetAddress subaddresses = netInterface
.getInetAddresses();
while (subaddresses.hasMoreElements()) {
InetAddress subaddress = subaddresses.nextElement();
System.out.println(subaddress.getHostAddress());
}
}
// 打印接口下所有IP
System.out.println(netInterface.getName());
EnumerationInetAddress addresses = netInterface
.getInetAddresses();
while (addresses.hasMoreElements()) {
InetAddress address = addresses.nextElement();
System.out.println(address.getHostAddress());
}
}
}
} catch (SocketException e) {
e.printStackTrace();
}
}
}
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