Java 通过NetworkInterface获取本机ip地址信息
Java 通过NetworkInterface获取本机ip地址信息
Socket:一台机器的通讯节点称为socket,在java中,socket是java.net包里面的Socket,ServerSocket,DataGramSocket,MultiSocket的实例。IP地址java中用java.net.InetAddress来表示。
java network address class包括:
InetAddress:ip地址或者域名,指向远程地址。如果域名解析不了,则出错。
抽象类,有两个子类:Inet4Address和Inet6Address。这两个类智能通过InetAddress的静态方法获取,不能直接构造。包可见。
InetSocketAddress extends SocketAddress:ip socket地址,用{ip,port}或者{hostname,port}表示。也能够单独用port构造,表示本机ip地址,所有本机网络地址。
NetwordInterface:本机网络接口,由多个网络接口名称和对应的网络接口的ip地址列表构成。
网络主机有两个特殊的网络地址:
loopback:127.0.0.1 用来检测本机的host名称,或者检测本地ip地址是否可用
wildcard:0.0.0.0 绑定了本机所有的ip地址
- import java.io.IOException;
- import java.net.Inet4Address;
- import java.net.InterfaceAddress;
- import java.net.NetworkInterface;
- import java.util.Enumeration;
- public class LocalIP {
- private static final void printIp() {
- try {
- for (Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces(); e.hasMoreElements();) {
- NetworkInterface item = e.nextElement();
- System.out.println(item.toString());
- System.out.println(item.getMTU() + " " + item.isLoopback() + " " + item.isPointToPoint() + " " + item.isUp() + " " + item.isVirtual());
- for (InterfaceAddress address : item.getInterfaceAddresses()) {
- if (address.getAddress() instanceof Inet4Address) {
- Inet4Address inet4Address = (Inet4Address) address.getAddress();
- System.out.println(inet4Address.getHostAddress());
- System.out.println(inet4Address.isLinkLocalAddress() + " " + inet4Address.isLoopbackAddress() + " " + inet4Address.isMCGlobal() + " " + inet4Address.isMulticastAddress());
- }
- }
- }
- } catch (IOException ex) {
- }
- }
- public static void main(String[] args) {
- printIp();
- }
- }
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