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 .Inet4Address;
import .Inet6Address;
import .InetAddress;
import workInterface;
import .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 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：/mxh-java/p/13187115.html
