让 Smackx PubSub 工作答案

【问题标题】：Getting Smackx PubSub working让 Smackx PubSub 工作
【发布时间】：2011-07-23 19:53:45
【问题描述】：

我有以下代码：

        PubSubManager manager = new PubSubManager(connection, "pubsub.openfire.local");
        LeafNode myNode = (LeafNode) manager.createNode("NewNode", form);

        SimplePayload payload = new SimplePayload("session", "pubsub:NewNode:session", "<sessionId>1234</sessionId>");


        // putting null for id means you let server generate id
        PayloadItem<SimplePayload> item = new PayloadItem<SimplePayload>(null, payload);

        // you could use publish() for asynchronous call
        myNode.send(item);

我在尝试发送节点值时不断收到以下错误：

冲突(409) 在 >org.jivesoftware.smackx.pubsub.packet.SyncPacketSend.getReply（SyncPacketSend.java:53）在 >org.jivesoftware.smackx.pubsub.packet.SyncPacketSend.getReply（SyncPacketSend.java:61）在 >org.jivesoftware.smackx.pubsub.PubSubManager.sendPubsubPacket（PubSubManager.java:324）在 >org.jivesoftware.smackx.pubsub.PubSubManager.sendPubsubPacket（PubSubManager.java:318）在 org.jivesoftware.smackx.pubsub.PubSubManager.createNode(PubSubManager.java:134) 在 PubSubPublisher.main(PubSubPublisher.java:33)

希望有任何关于如何调试或继续前进的想法。谢谢。

【问题讨论】：

标签： java openfire publish-subscribe

【解决方案1】：

您尝试创建的节点已经存在。请先致电getNode 和/或deleteNode，然后再致电createNode。将您的代码包装在 try/catch 块中以处理可能被抛出的 XMPPException。

LeafNode myNode = null;
try{
  try{
    LeafNode existingNode = manager.getNode("NewNode");  
    //exists, so delete
    manager.deleteNode("NewNode");
  }catch(XMPPException e){
    //'getNode' threw an exception.
    //so we know that the node did not exist
  }
  myNode = (LeafNode) manager.createNode("NewNode", form);
}catch(XMPPException e){
  System.err.println(e);
}

【讨论】：