java - 重新注册服务 JMDNS

Question

我有一个我认为非常简单的问题。

我正在尝试使用 JmDNS 来广播我已经成功完成的服务，但是当应用程序暂停时，我想取消注册服务，然后在恢复应用程序时重新注册服务。

然而，我在执行此操作时遇到了问题。代码如下:

//I use jmdns.create again before these lines which I don't know if i should?

mServiceInfo = ServiceInfo.create(registeredServiceName, registeredServiceType, registeredServicePort,"Hello");

try {       

     jmdnsNetworkDiscoveryManager.registerService(mServiceInfo);
    } 
catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
        Log.i(TAG, "Service Registration Error");
     }

当我尝试这个时，我得到了这个让我困惑的错误日志:

07-29 10:38:13.099: W/DNSStateTask(28769): java.lang.StringIndexOutOfBoundsException: length=37; regionStart=0; regionLength=-1
07-29 10:38:13.099: W/DNSStateTask(28769):  at java.lang.String.startEndAndLength(String.java:593)

07-29 10:38:13.099: W/DNSStateTask(28769):  at java.lang.String.substring(String.java:1474)

07-29 10:38:13.099: W/DNSStateTask(28769):  at javax.jmdns.impl.ServiceInfoImpl.decodeQualifiedNameMapForType(ServiceInfoImpl.java:292)

07-29 10:38:13.099: W/DNSStateTask(28769):  at javax.jmdns.impl.DNSEntry.<init>(DNSEntry.java:47)

07-29 10:38:13.099: W/DNSStateTask(28769):  at javax.jmdns.impl.DNSQuestion.<init>(DNSQuestion.java:220)

07-29 10:38:13.099: W/DNSStateTask(28769):  at javax.jmdns.impl.DNSQuestion$AllRecords.<init>(DNSQuestion.java:184)

07-29 10:38:13.099: W/DNSStateTask(28769):  at javax.jmdns.impl.DNSQuestion.newQuestion(DNSQuestion.java:245)

07-29 10:38:13.099: W/DNSStateTask(28769):  at javax.jmdns.impl.tasks.state.Prober.buildOutgoingForInfo(Prober.java:131)

07-29 10:38:13.099: W/DNSStateTask(28769):  at javax.jmdns.impl.tasks.state.DNSStateTask.run(DNSStateTask.java:125)

07-29 10:38:13.099: W/DNSStateTask(28769):  at java.util.Timer$TimerImpl.run(Timer.java:284)

07-29 10:38:13.104: W/JmDNSImpl(28769): RECOVERING
07-29 10:38:13.119: W/DNSStateTask(28769): Canceler(192-168-2-2.local.).run() exception 
07-29 10:38:13.119: W/DNSStateTask(28769): java.lang.StringIndexOutOfBoundsException: length=37; regionStart=0; regionLength=-1

07-29 10:38:13.119: W/DNSStateTask(28769):  at java.lang.String.startEndAndLength(String.java:593)

07-29 10:38:13.119: W/DNSStateTask(28769):  at java.lang.String.substring(String.java:1474)

07-29 10:38:13.119: W/DNSStateTask(28769):  at javax.jmdns.impl.ServiceInfoImpl.decodeQualifiedNameMapForType(ServiceInfoImpl.java:292)

07-29 10:38:13.119: W/DNSStateTask(28769):  at javax.jmdns.impl.DNSEntry.<init>(DNSEntry.java:47)

07-29 10:38:13.119: W/DNSStateTask(28769):  at javax.jmdns.impl.DNSRecord.<init>(DNSRecord.java:46)

07-29 10:38:13.119: W/DNSStateTask(28769):  at javax.jmdns.impl.DNSRecord$Service.<init>(DNSRecord.java:647)

07-29 10:38:13.119: W/DNSStateTask(28769):  at javax.jmdns.impl.ServiceInfoImpl.answers(ServiceInfoImpl.java:1195)

07-29 10:38:13.119: W/DNSStateTask(28769):  at javax.jmdns.impl.tasks.state.Canceler.buildOutgoingForInfo(Canceler.java:117)

07-29 10:38:13.119: W/DNSStateTask(28769):  at javax.jmdns.impl.tasks.state.DNSStateTask.run(DNSStateTask.java:125)

07-29 10:38:13.119: W/DNSStateTask(28769):  at java.util.Timer$TimerImpl.run(Timer.java:284)

有人可以向我解释我做错了什么或其他方法吗？我应用于服务创建的字符串绝对有效，因为它们用于在应用程序的早期注册服务。

Answer 1

我遇到了同样的问题。事实证明，当您的事件类型无效时，ServiceInfo.create() 并没有优雅地告诉您。在我的例子中，我发送的是“_http._tcp”。作为事件类型。我将事件类型更改为“_http._tcp.local”，一切正常。希望对您有所帮助。