java本機ip,java本機ip地址

本文目錄一覽：

• 1、java中如何獲取到本機的外網ip地址?
• 2、java怎麼獲取當前電腦的內網ip
• 3、java中如何過去本機ip地址並輸出

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，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符串

* 從返回的字符串如下

* htmlheadtitleCurrent IP Check/title/headbodyCurrent IP Address: 123.147.226.222/body/html

* @param externalIpProviderUrl

* @return

*/

private String fetchExternalIpProviderHTML(String externalIpProviderUrl) {

// 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;

}

// 將字節轉化為為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(“”);

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

}

}

java怎麼獲取當前電腦的內網ip

public void PingAll() throws Exception{

//首先得到本機的IP，得到網段

InetAddress host = InetAddress.getLocalHost();

String hostAddress = host.getHostAddress();

int k=0;

k=hostAddress.lastIndexOf(“.”);

String ss = hostAddress.substring(0,k+1);

for(int i=1;i =255;i++){ //對所有局域網Ip

String iip=ss+i;

Ping(iip);

}

java中如何過去本機ip地址並輸出

InetAddress addr = InetAddress.getLocalHost();

ip=addr.getHostAddress().toString;//獲得本機IP

address=addr.getHostName()toString;//獲得本機名稱