[英]Samples with JmDNS
I've been able to get the samples that come with JmDNS to compile and run, however I can't get any of the classes to discover my services. 我已经能够获得JmDNS附带的样本进行编译和运行,但是我无法获得任何类来发现我的服务。
I'm running a Windows environment with multiple PC's running VNC, SSH & Apache and I've been trying to get JmDNS to discover at least one of these... 我正在运行一个Windows环境,其中有多个PC正在运行VNC,SSH和Apache,我一直试图让JmDNS发现其中至少有一个......
What I ideally want is to be able to detect all running VNC servers on my network. 我理想的是能够检测到我网络上所有正在运行的VNC服务器。 Is there some sort of client and server pairing where I can only discover a service if I've registered it using JmDNS?
是否存在某种客户端和服务器配对,如果我使用JmDNS注册它,我只能发现服务?
Any help getting some results out of the samples will be appreciated, the documentation isn't much help. 任何帮助从样本中获得一些结果将不胜感激,文档没有太大的帮助。
import java.io.IOException;
import java.util.logging.ConsoleHandler;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.jmdns.JmDNS;
import javax.jmdns.ServiceEvent;
import javax.jmdns.ServiceListener;
/**
* Sample Code for Service Discovery using JmDNS and a ServiceListener.
* <p>
* Run the main method of this class. It listens for HTTP services and lists all changes on System.out.
*
* @author Werner Randelshofer
*/
public class DiscoverServices {
static class SampleListener implements ServiceListener {
@Override
public void serviceAdded(ServiceEvent event) {
System.out.println("Service added : " + event.getName() + "." + event.getType());
}
@Override
public void serviceRemoved(ServiceEvent event) {
System.out.println("Service removed : " + event.getName() + "." + event.getType());
}
@Override
public void serviceResolved(ServiceEvent event) {
System.out.println("Service resolved: " + event.getInfo());
}
}
/**
* @param args
* the command line arguments
*/
public static void main(String[] args) {
try {
// Activate these lines to see log messages of JmDNS
boolean log = false;
if (log) {
Logger logger = Logger.getLogger(JmDNS.class.getName());
ConsoleHandler handler = new ConsoleHandler();
logger.addHandler(handler);
logger.setLevel(Level.FINER);
handler.setLevel(Level.FINER);
}
final JmDNS jmdns = JmDNS.create();
String type = "_http._tcp.local.";
if(args.length > 0) {
type = args[0];
}
jmdns.addServiceListener(type, new SampleListener());
System.out.println("Press q and Enter, to quit");
int b;
while ((b = System.in.read()) != -1 && (char) b != 'q') {
/* Stub */
}
jmdns.close();
System.out.println("Done");
} catch (IOException e) {
e.printStackTrace();
}
}
}
To discover a specific type of service, you need to know the correct service type name, check out DNS SRV (RFC 2782) Service Types : 要发现特定类型的服务,您需要知道正确的服务类型名称,请查看DNS SRV(RFC 2782)服务类型 :
String bonjourServiceType = "_http._tcp.local.";
bonjourService = JmDNS.create();
bonjourService.addServiceListener(bonjourServiceType, bonjourServiceListener);
ServiceInfo[] serviceInfos = bonjourService.list(bonjourServiceType);
for (ServiceInfo info : serviceInfos) {
System.out.println("## resolve service " + info.getName() + " : " + info.getURL());
}
bonjourService.close();
For VNC, use _rfb._tcp.local. 对于VNC,请使用_rfb._tcp.local。
For SSH, use _ssh._tcp.local. 对于SSH,请使用_ssh._tcp.local。
For Apache, use _http._tcp.local. 对于Apache,请使用_http._tcp.local。
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