Java获取本机IP地址,并根据IP地址的网段,扫描局域网里面的电脑设备;

import java.io.IOException;

import java.net.Inet4Address;

import java.net.Inet6Address;

import java.net.InetAddress;

import java.net.NetworkInterface;

import java.net.UnknownHostException;

import java.util.Enumeration;

import java.util.HashSet;

import java.util.Set;

/**

* 类注解

*

* @author 尘世间迷茫的小书童

* @date 2020年06月23日 17:31

*/

public class Demo {

public static void main(String[] args) {

Set set = getIpAddress();

if(set.size() > 0) {

set.forEach(ip -> {

System.out.println("本机ip: " + ip);

});

}

set.remove("127.0.0.1");

scannerNetwork(set);

System.out.println("扫描完毕...");

System.exit(0);

}

/**

* 获取本机的IP地址(包括ipv4和ipv6)

* 包含回环地址127.0.0.1和0:0:0:0:0:0:0:1

*/

private static Set getIpAddress() {

Set ipList = new HashSet<>();

try {

Enumeration allNetInterfaces = NetworkInterface.getNetworkInterfaces();

InetAddress ip = null;

while (allNetInterfaces.hasMoreElements()) {

NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();

// 排除虚拟接口和没有启动运行的接口

if (netInterface.isVirtual() || !netInterface.isUp()) {

continue;

} else {

Enumeration addresses = netInterface.getInetAddresses();

while (addresses.hasMoreElements()) {

ip = addresses.nextElement();

// if (ip != null && (ip instanceof Inet4Address || ip instanceof Inet6Address)) {

// ipList.add(ip.getHostAddress());

// }

if (ip != null && (ip instanceof Inet4Address)) {

ipList.add(ip.getHostAddress());

}

}

}

}

} catch (Exception e) {

e.printStackTrace();

}

return ipList;

}

/**

* 根据本机ip扫描局域网设备

* @param set

*/

private static void scannerNetwork(Set set) {

try {

set.forEach(address -> {

// 设置IP地址网段

String ips = getNetworkSegment(address);

System.out.println("开始扫描 " + ips + "网段...");

String ip;

InetAddress addip = null;

// 遍历IP地址

for (int i = 1; i < 255; i++) {

ip = ips + i;

try {

addip = InetAddress.getByName(ip);

} catch (UnknownHostException e) {

System.out.println("找不到主机: " + ip);

}

// 获取登录过的设备

if (!ip.equals(addip.getHostName())) {

try {

// 检查设备是否在线，其中1000ms指定的是超时时间

boolean status = InetAddress.getByName(addip.getHostName()).isReachable(1000); // 当返回值是true时，说明host是可用的，false则不可。

System.out.println("IP地址为:" + ip + "\t\t设备名称为: " + addip.getHostName() + "\t\t是否可用: "

+ (status ? "可用" : "不可用"));

} catch (UnknownHostException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}

});

} catch (Exception uhe) {

System.err.println("Unable to find: " + uhe.getLocalizedMessage());

}

}

/**

* 根据ip获取网段

* @param ip

* @return

*/

private static String getNetworkSegment(String ip) {

int startIndex = ip.lastIndexOf(".");

return ip.substring(0, startIndex+1);

}

}

来源：https://www.cnblogs.com/mxh-java/p/13187115.html