java本机ip,java本机ip地址

本文目录一览：

• 1、java中如何获取到本机的外网ip地址?
• 2、java怎么获取当前电脑的内网ip
• 3、java中如何过去本机ip地址并输出

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怎么获取当前电脑的内网ip

public void PingAll() throws Exception{

//首先得到本机的IP，得到网段

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++){ //对所有局域网Ip

String iip=ss+i;

Ping(iip);

}

java中如何过去本机ip地址并输出

InetAddress addr = InetAddress.getLocalHost();

ip=addr.getHostAddress().toString;//获得本机IP

address=addr.getHostName()toString;//获得本机名称