java 如何提取本地IP

java 如何提取本地IP,第1张

import javanet;

public class Test {

public static void main(String[] args) throws Exception {

String ip = InetAddressgetLocalHost()getHostAddress();

Systemoutprintln(ip);

}

}

代码亲测可用:

import javanetInetAddress;

import javanetUnknownHostException;

public class TestInetAddress {

InetAddress myIpAddress = null;

InetAddress[] myServer = null;

public static void main(String args[]) {

TestInetAddress address = new TestInetAddress();

Systemoutprintln("Your host IP is: " + addressgetLocalhostIP());

String domain = ">

1得到局域网网段,可由自己机器的IP来确定 (也可以手动获取主机IP-CMD-ipconfig /all)

2根据IP类型,一次遍历局域网内IP地址

JAVA类,编译之后直接运行便可以得到局域网内所有IP,具体怎样使用你自己编写相应代码调用便可

代码如下::

package bean;

import javaio;

import javautil;

public class Ip{

static public HashMap ping; //ping 后的结果集

public HashMap getPing(){ //用来得到ping后的结果集

return ping;

}

//当前线程的数量, 防止过多线程摧毁电脑

static int threadCount = 0;

public Ip() {

ping = new HashMap();

}

public void Ping(String ip) throws Exception{

//最多30个线程

while(threadCount>30)

Threadsleep(50);

threadCount +=1;

PingIp p = new PingIp(ip);

pstart();

}

public void PingAll() throws Exception{

//首先得到本机的IP,得到网段

InetAddress host = InetAddressgetLocalHost();

String hostAddress = hostgetHostAddress();

int k=0;

k=hostAddresslastIndexOf("");

String ss = hostAddresssubstring(0,k+1);

for(int i=1;i <=255;i++){ //对所有局域网Ip

String iip=ss+i;

Ping(iip);

}

//等着所有Ping结束

while(threadCount>0)

Threadsleep(50);

}

public static void main(String[] args) throws Exception{

Ip ip= new Ip();

ipPingAll();

javautilSet entries = pingentrySet();

Iterator iter=entriesiterator();

String k;

while(iterhasNext()){

MapEntry entry=(MapEntry)iternext();

String key=(String)entrygetKey();

String value=(String)entrygetValue();

if(valueequals("true"))

Systemoutprintln(key+"-->"+value);

}

}

class PingIp extends Thread{

public String ip; // IP

public PingIp(String ip){

thisip=ip;

}

public void run(){

try{

Process p= RuntimegetRuntime()exec ("ping "+ip+ " -w 300 -n 1");

InputStreamReader ir = new InputStreamReader(pgetInputStream());

LineNumberReader input = new LineNumberReader (ir);

//读取结果行

for (int i=1 ; i <7; i++)

inputreadLine();

String line= inputreadLine();

if (linelength() <17 || linesubstring(8,17)equals("timed out"))

pingput(ip,"false");

else

pingput(ip,"true");

//线程结束

threadCount -= 1;

}catch (IOException e){}

}

}

}

public static void main(String[] args) { try { // 获取计算机名 String name = InetAddressgetLocalHost()getHostName(); // 获取IP地址 String ip = InetAddressgetLocalHost()getHostAddress(); Systemoutprintln("计算机名:"+name); Systemoutprintln("IP地址:"+ip); } catch (UnknownHostException e) { Systemoutprintln("异常:" + e); eprintStackTrace(); } }

是否可以解决您的问题?

1得到局域网网段,可由自己机器的IP来确定 (也可以手动获取主机IP-CMD-ipconfig /all)

2根据IP类型,一次遍历局域网内IP地址

JAVA类,编译之后直接运行便可以得到局域网内所有IP,具体怎样使用你自己编写相应代码调用便可

代码如下::

package bean;

import javaio;

import javautil;

public class Ip{

static public HashMap ping; //ping 后的结果集

public HashMap getPing(){ //用来得到ping后的结果集

return ping;

}

//当前线程的数量, 防止过多线程摧毁电脑

static int threadCount = 0;

public Ip() {

ping = new HashMap();

}

public void Ping(String ip) throws Exception{

//最多30个线程

while(threadCount>30)

Threadsleep(50);

threadCount +=1;

PingIp p = new PingIp(ip);

pstart();

}

public void PingAll() throws Exception{

//首先得到本机的IP,得到网段

InetAddress host = InetAddressgetLocalHost();

String hostAddress = hostgetHostAddress();

int k=0;

k=hostAddresslastIndexOf("");

String ss = hostAddresssubstring(0,k+1);

for(int i=1;i <=255;i++){ //对所有局域网Ip

String iip=ss+i;

Ping(iip);

}

//等着所有Ping结束

while(threadCount>0)

Threadsleep(50);

}

public static void main(String[] args) throws Exception{

Ip ip= new Ip();

ipPingAll();

javautilSet entries = pingentrySet();

Iterator iter=entriesiterator();

String k;

while(iterhasNext()){

MapEntry entry=(MapEntry)iternext();

String key=(String)entrygetKey();

String value=(String)entrygetValue();

if(valueequals("true"))

Systemoutprintln(key+"-->"+value);

}

}

class PingIp extends Thread{

public String ip; // IP

public PingIp(String ip){

thisip=ip;

}

public void run(){

try{

Process p= RuntimegetRuntime()exec ("ping "+ip+ " -w 300 -n 1");

InputStreamReader ir = new InputStreamReader(pgetInputStream());

LineNumberReader input = new LineNumberReader (ir);

//读取结果行

for (int i=1 ; i <7; i++)

inputreadLine();

String line= inputreadLine();

if (linelength() <17 || linesubstring(8,17)equals("timed out"))

pingput(ip,"false");

else

pingput(ip,"true");

//线程结束

threadCount -= 1;

}catch (IOException e){}

}

}

}

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