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java獲取ip地址外網

發布時間:2022-12-10 04:23:54

java怎麼獲取IP地址

java代碼獲取ip地址方法是
調用java.net包下面的的InetAddress類獲取。

⑵ JAVA獲取外網IP

請參考以下代碼,可以獲得任意給定網卡的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 {
Enumeration<NetworkInterface> netInterfaces = NetworkInterface
.getNetworkInterfaces();
if (netInterfaces.hasMoreElements()) {
NetworkInterface netInterface = netInterfaces.nextElement();
if (netCard.equals(netInterface.getName())) {
// 子介面,linux下會取到父介面??
Enumeration<NetworkInterface> subnetInterfaces = netInterface
.getSubInterfaces();
while (subnetInterfaces.hasMoreElements()) {
NetworkInterface subnetInterface = subnetInterfaces
.nextElement();
System.out.println(subnetInterface.getName());
Enumeration<InetAddress> subaddresses = netInterface
.getInetAddresses();
while (subaddresses.hasMoreElements()) {
InetAddress subaddress = subaddresses.nextElement();
System.out.println(subaddress.getHostAddress());
}
}
// 列印介面下所有IP
System.out.println(netInterface.getName());
Enumeration<InetAddress> addresses = netInterface
.getInetAddresses();
while (addresses.hasMoreElements()) {
InetAddress address = addresses.nextElement();
System.out.println(address.getHostAddress());
}
}
}
} catch (SocketException e) {
e.printStackTrace();
}
}
}


⑶ java中如何獲取到本機的外網ip地址

java獲取本機的外網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;

/**
* 獲取本機外網IP地址
* 思想是訪問網站http://checkip.dyndns.org/,得到返回的文本後解析出本機在外網的IP地址
* @author pieryon
*
*/
public class ExternalIpAddressFetcher {
// 外網IP提供者的網址
private String externalIpProviderUrl;

// 本機外網IP地址
private String myExternalIpAddress;

public ExternalIpAddressFetcher(String externalIpProviderUrl) {
this.externalIpProviderUrl = externalIpProviderUrl;

String returnedhtml = fetchExternalIpProviderHTML(externalIpProviderUrl);

parse(returnedhtml);
}

/**
* 從外網提供者處獲得包含本機外網地址的字元串
* 從http://checkip.dyndns.org返回的字元串如下
* <html><head><title>Current IP Check</title></head><body>Current IP Address: 123.147.226.222</body></html>
* @param externalIpProviderUrl
* @return
*/
private String fetchExternalIpProviderHTML(String externalIpProviderUrl) {
// 輸入流
InputStream in = null;

// 到外網提供者的Http連接
HttpURLConnection httpConn = null;

try {
// 打開連接
URL url = new URL(externalIpProviderUrl);
httpConn = (HttpURLConnection) url.openConnection();

// 連接設置
HttpURLConnection.setFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.setRequestProperty("User-Agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)");

// 獲取連接的輸入流
in = httpConn.getInputStream();
byte[] bytes=new byte[1024];// 此大小可根據實際情況調整

// 讀取到數組中
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead=in.read(bytes, offset, bytes.length-offset)) >= 0) {
offset += numRead;
}

// 將位元組轉化為為UTF-8的字元串
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();
}
}

// 出現異常則返回空
return null;
}

/**
* 使用正則表達式解析返回的HTML文本,得到本機外網地址
* @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);
}
}

/**
* 得到本機外網地址,得不到則為空
* @return
*/
public String getMyExternalIpAddress() {
return myExternalIpAddress;
}

public static void main(String[] args){
ExternalIpAddressFetcher fetcher=new ExternalIpAddressFetcher("http://checkip.dyndns.org/");

System.out.println(fetcher.getMyExternalIpAddress());
}
}

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