一、jmDNS：JAVA实现（JmDNS）

1. 引入pom

   <!-- https://mvnrepository.com/artifact/javax.jmdns/jmdns -->
   <dependency><groupId>javax.jmdns</groupId><artifactId>jmdns</artifactId><version>3.4.1</version>
   </dependency>

2. 服务发现

   import java.io.IOException;
   import java.net.InetAddress;
   import java.net.UnknownHostException;import javax.jmdns.JmDNS;
   import javax.jmdns.ServiceEvent;
   import javax.jmdns.ServiceListener;public class ExampleServiceDiscovery {private static class SampleListener implements ServiceListener {@Overridepublic void serviceAdded(ServiceEvent event) {System.out.println("Service added: " + event.getInfo());}@Overridepublic void serviceRemoved(ServiceEvent event) {System.out.println("Service removed: " + event.getInfo());}@Overridepublic void serviceResolved(ServiceEvent event) {System.out.println("Service resolved: " + event.getInfo());}}public static void main(String[] args) throws InterruptedException {try {// Create a JmDNS instanceJmDNS jmdns = JmDNS.create(InetAddress.getLocalHost());// Add a service listener
   //            jmdns.addServiceListener("_http._tcp.local.", new SampleListener());jmdns.addServiceListener("_coap._udp.local.", new SampleListener());// Wait a bitThread.sleep(30000);} catch (UnknownHostException e) {System.out.println(e.getMessage());} catch (IOException e) {System.out.println(e.getMessage());}}
   }

3. 服务发布

   import java.io.IOException;
   import java.net.InetAddress;import javax.jmdns.JmDNS;
   import javax.jmdns.ServiceInfo;public class ExampleServiceRegistration {public static void main(String[] args) throws InterruptedException {try {// Create a JmDNS instanceJmDNS jmdns = JmDNS.create(InetAddress.getLocalHost());// Register a serviceServiceInfo serviceInfo = ServiceInfo.create("_coap._udp.local.", "example", 5683, "path=index.html");jmdns.registerService(serviceInfo);// Wait a bitThread.sleep(25000);// Unregister all servicesjmdns.unregisterAllServices();} catch (IOException e) {System.out.println(e.getMessage());}}
   }

4. 发现端日志

5. 监控局域网avahi发布的服务

    

 二、avahi：Linux下实现（avahi - mDNS/DNS-SD）

avahi安装

sudo apt-get install avahi-deamon avahi-utils
# 无法安装可以试试：sudo apt-get install avahi

发布服务

avahi-publish-service avahi_light _coap._udp 5683 "/mylight" --sub _floor1._sub._coap._udp

发现服务（再起一个客户端连接）

avahi-browse -a --resolv

发现服务日志

服务关闭日志