mirror of
https://github.com/vanitasvitae/Smack.git
synced 2024-11-14 00:02:05 +01:00
94 lines
3.3 KiB
Markdown
94 lines
3.3 KiB
Markdown
Messaging using Chats
|
|
=====================
|
|
|
|
[Back](index.html)
|
|
|
|
Sending messages back and forth is at the core of instant messaging. Although
|
|
individual messages can be sent and received as packets, it's generally easier
|
|
to treat the string of messages as a chat using the
|
|
`org.jivesoftware.smack.Chat` class.
|
|
|
|
Chat
|
|
----
|
|
|
|
A chat creates a new thread of messages (using a thread ID) between two users.
|
|
The following code snippet demonstrates how to create a new Chat with a user
|
|
and then send them a text message:
|
|
|
|
```
|
|
// Assume we've created a XMPPConnection name "connection"._
|
|
ChatManager chatmanager = connection.getChatManager();
|
|
Chat newChat = chatmanager.createChat("jsmith@jivesoftware.com", new MessageListener() {
|
|
public void processMessage(Chat chat, Message message) {
|
|
System.out.println("Received message: " + message);
|
|
}
|
|
});
|
|
|
|
try {
|
|
newChat.sendMessage("Howdy!");
|
|
}
|
|
catch (XMPPException e) {
|
|
System.out.println("Error Delivering block");
|
|
}
|
|
```
|
|
|
|
The `Chat.sendMessage(String)` method is a convenience method that creates a
|
|
Message object, sets the body using the String parameter, then sends the
|
|
message. In the case that you wish to set additional values on a Message
|
|
before sending it, use the `Chat.createMessage()` and
|
|
`Chat.sendMessage(Message)` methods, as in the following code snippet:
|
|
|
|
```
|
|
Message newMessage = new Message();
|
|
newMessage.setBody("Howdy!");
|
|
message.setProperty("favoriteColor", "red");
|
|
newChat.sendMessage(newMessage);
|
|
```
|
|
|
|
You'll also notice in the example above that we specified a MessageListener
|
|
when creating a chat. The listener is notified any time a new message arrives
|
|
from the other user in the chat. The following code snippet uses the listener
|
|
as a parrot-bot -- it echoes back everything the other user types.
|
|
|
|
```
|
|
// Assume a MessageListener we've setup with a chat._
|
|
|
|
public void processMessage(Chat chat, Message message) {
|
|
// Send back the same text the other user sent us._
|
|
chat.sendMessage(message.getBody());
|
|
}
|
|
```
|
|
|
|
Incoming Chat
|
|
-------------
|
|
|
|
When chats are prompted by another user, the setup is slightly different since
|
|
you are receiving a chat message first. Instead of explicitly creating a chat
|
|
to send messages, you need to register to handle newly created Chat instances
|
|
when the ChatManager creates them. The ChatManager will already find a
|
|
matching chat (by thread id) and if none exists, then it will create a new one
|
|
that does match. To get this new chat, you have to register to be notified
|
|
when it happens. You can register a message listener to receive all future
|
|
messages as part of this handler.
|
|
|
|
```
|
|
_// Assume we've created a XMPPConnection name "connection"._
|
|
ChatManager chatmanager = connection.getChatManager().addChatListener(
|
|
new ChatManagerListener() {
|
|
@Override
|
|
public void chatCreated(Chat chat, boolean createdLocally)
|
|
{
|
|
if (!createdLocally)
|
|
chat.addMessageListener(new MyNewMessageListener());;
|
|
}
|
|
});
|
|
```
|
|
|
|
In addition to thread based chat messages, there are some clients that do not
|
|
send a thread id as part of the chat. To handle this scenario, Smack will
|
|
attempt match the incoming messages to the best fit existing chat, based on
|
|
the JID. It will attempt to find a chat with the same full JID, failing that,
|
|
it will try the base JID. If no existing chat to the user can found, then a
|
|
new one is created.
|
|
|
|
Copyright (C) Jive Software 2002-2008
|