2003-06-19 20:11:37 +02:00
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<title>Smack: Chat - Jive Software</title>
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<div class="header">
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Messaging using Chat and GroupChat
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<div class="nav">
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« <a href="index.html">Table of Contents</a>
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<p>
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Sending messages back and forth is at the core of instant messaging. Two classes
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aid in sending and receiving messages:
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<ul>
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<li> <tt>org.jivesoftware.smack.Chat</tt> -- used to send messages between two people.
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<li> <tt>org.jivesoftware.smack.GroupChat</tt> -- used to join a chat room to send messages between many people.
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</ul>
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Both the Chat and GroupChat classes use the <tt>org.jivesoftware.smack.packet.Message</tt> packet
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class to send messages. In certain circumstances, you may wish to bypass the higher-level
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Chat and GroupChat classes to send and listen for messages directly.
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</p>
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<p class="subheader">
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Chat
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</p>
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2003-08-30 16:11:52 +02:00
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A chat creates a new thread of messages (using a thread ID) between two users. The
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following code snippet demonstrates how to create a new Chat with a user and then send
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them a text message:<p>
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<div class="code"><pre>
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<font color="gray"><i>// Assume we've created an XMPPConnection name "connection".</i></font>
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Chat newChat = connection.createChat(<font color="green">"jsmith@jivesoftware.com"</font>);
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newChat.sendMessage(<font color="green">"Howdy!"</font>);
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</pre></div><p>
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The <tt>Chat.sendMessage(String)</tt> method is a convenience method that creates a Message
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object, sets the body using the String parameter, then sends the message. In the case
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that you wish to set additional values on a Message before sending it, use the
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<tt>Chat.createMessage()</tt> and <tt>Chat.sendMessage(Message)</tt> methods, as in the
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following code snippet:<p>
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<div class="code"><pre>
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<font color="gray"><i>// Assume we've created an XMPPConnection name "connection".</i></font>
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Chat newChat = connection.createChat(<font color="green">"jsmith@jivesoftware.com"</font>);
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Message newMessage = newChat.createMessage();
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newMessage.setBody(<font color="green">"Howdy!"</font>);
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message.setProperty(<font color="green">"favoriteColor"</font>, <font color="green">"red"</font>);
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newChat.sendMessage(newMessage);
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</pre></div><p>
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The Chat object allows you to easily listen for replies from the other chat participant.
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The following code snippet is a parrot-bot -- it echoes back everything the other user types.<p>
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<div class="code"><pre>
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<font color="gray"><i>// Assume we've created an XMPPConnection name "connection".</i></font>
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Chat newChat = connection.createChat(<font color="green">"jsmith@jivesoftware.com"</font>);
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newMessage.setBody(<font color="green">"Hi, I'm an annoying parrot-bot! Type something back to me."</font>);
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<b>while</b> (<b>true</b>) {
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<font color="gray"><i>// Wait for the next message the user types to us.</i></font>
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Message message = newChat.nextMessage();
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<font color="gray"><i>// Send back the same text the other user sent us.</i></font>
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newChat.sendMessage(message.getBody());
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}
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</pre></div><p>
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The code above uses the <tt>Chat.nextMessage()</tt> method to get the next message, which
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will wait indefinitely until another message comes in. There are other methods to wait
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a specific amount of time for a new message, or you can add a listener that will be notified
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every time a new message arrives.
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<p class="subheader">
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GroupChat
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</p>
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A group chat connects to a chat room on a server and allows you to send and receive messages
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from a group of people. Before you can send or receive messages, you must join the room using
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a nickname. The following code snippet connects to a chat room and sends a
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message.<p>
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<div class="code"><pre>
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<font color="gray"><i>// Assume we've created an XMPPConnection name "connection".</i></font>
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GroupChat newGroupChat = connection.createGroupChat(<font color="green">"test@jivesoftware.com"</font>);
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<font color="gray"><i>// Join the group chat using the nickname "jsmith".</i></font>
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newGroupChat.join(<font color="green">"jsmith"</font>);
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<font color="gray"><i>// Send a message to all the other people in the chat room.</i></font>
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newGroupChat.sendMessage(<font color="green">"Howdy!"</font>);
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</pre></div><p>
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In general, sending and receiving messages in a group chat works very similarly to
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the <tt>Chat</tt> class. Method are also provided to get the list of the other
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users in the room.<p>
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<br clear="all" /><br><br>
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<div class="footer">
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Copyright © Jive Software 2002-2003
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</div>
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</body>
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</html>
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