在客户端-服务器中发现JmDNS服务

I'm trying to enable service discovery in my client-server application using JmDNS. I fully understand service registry on the server side, with code that resembles this:

我正在尝试使用JmDNS在客户机-服务器应用程序中启用服务发现。我完全理解服务器端的service registry，其代码类似如下:

JmDNS jmdns = JmDNS.create(localhost);
jmdns.register(serviceInfo);

However, I'm having trouble figuring out how to have my client retrieve the port number and IP address from the registered service and use this data to open a TCP connection. I've searched for examples of how to use JmDNS but to no avail. Can anyone here give me some basic examples? Or if anyone has any links to good resources/tutorials on JmDNS could they please provide them?

然而，我很难弄清楚如何让我的客户端从注册的服务中检索端口号和IP地址，并使用这些数据打开TCP连接。我已经搜索了如何使用JmDNS的示例，但是没有任何用处。这里有人能给我一些基本的例子吗?或者，如果有人有关于JmDNS的好资源/教程的链接，他们可以提供吗?

Note: JmDNS is a neccessity here, so I would appreciate answers pertaining only to JmDNS and not offering an alternative. Also, I have looked at the JmDNS API extensively, and still can't figure it out, so please don't post a link to the docs as a resource.

注意:JmDNS在这里是一个必要条件，所以我希望您能回答关于JmDNS的问题，而不是提供另一种选择。另外，我已经详细地研究了JmDNS API，但仍然无法找到它，所以请不要将到文档的链接作为资源发布。

Thanks.

谢谢。

1 个解决方案

#1

Server side:

服务器端:

mdnsServer = JmDNS.create(localhost);
// Register a test service.
ServiceInfo testService = ServiceInfo.create("my-service-type", "Test Service", 6666, "test service");
mdnsServer.registerService(testService);

Client side:

客户端:

private ServiceListener mdnsServiceListener = new ServiceListener() {
  public void serviceAdded(ServiceEvent serviceEvent) {
    // Test service is discovered. requestServiceInfo() will trigger serviceResolved() callback.
    mdnsService.requestServiceInfo(Constants.mdnsServiceType, serviceEvent.getName());
  }

  public void serviceRemoved(ServiceEvent serviceEvent) {
    // Test service is disappeared.
  }

  public void serviceResolved(ServiceEvent serviceEvent) {
    // Test service info is resolved.
    String serviceUrl = serviceEvent.getInfo().getURL();
    // serviceURL is usually something like http://192.168.11.2:6666/my-service-name
};

mdnsService = JmDNS.create();
mdnsService.addServiceListener("my-service-type", mdnsServiceListener);
ServiceInfo[] infos = mdnsService.list(Constants.mdnsServiceType);

// Retrieve service info from either ServiceInfo[] returned here or listener callback method above.
mdnsService.removeServiceListener("my-service-type", mdnsServiceListener);
mdnsService.close();

Once you have the URL http://192.168.11.2:6666/myTestService, you can parse/use it open socket connection. Hope that help.

一旦您有了URL http://192.168.11.2:6666/myTestService，您可以解析/使用它打开套接字连接。希望有帮助。

#1