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<title>Smack: Getting Started - Jive Software</title>
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<body>
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<div class="header">
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Smack: Getting Started
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</div>
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<div class="nav">
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« <a href="index.html">Table of Contents</a>
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</div>
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<p>
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This document will introduce you to the Smack API and provide an overview of
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important classes and concepts.
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</p>
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<p class="subheader">
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JAR Files and Requirements
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</p>
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Smack is meant to be easily embedded into any existing JDK 1.5 or later Java application.
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It has no external dependencies (except for the Jingle voice chat functionality) and is optimized
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to be as small as possible. The library ships as several JAR files to provide more flexibility
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over which features applications require:
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<ul>
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<li><tt>smack.jar</tt> -- provides core XMPP functionality and is the only <b>required</b>
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library. All XMPP features that are part of the XMPP RFCs are included.</li>
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<li><tt>smackx.jar</tt> -- support for many of the the extensions (XEPs) defined
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by the XMPP Standards Foundation, including multi-user chat, file transfer, user search, etc.
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The extensions are documented in the <a href="extensions/index.html">extensions manual</a>.</li>
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<li><tt>smackx-debug.jar</tt> -- an enhanced GUI debugger for protocol traffic. It will
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automatically be used when found in the classpath and when <a href="debugging.html">debugging</a>
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is enabled.</li>
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</ul>
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<p class="subheader">
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Establishing a Connection
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</p>
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The <tt>XMPPConnection</tt> class is used to create a connection to an
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XMPP server. Below are code examples for making a connection:<p>
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<div class="code">
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<pre>
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<font color="gray"><i>// Create a connection to the jabber.org server.</i></font>
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Connection conn1 = <font color="navy"><b>new</b></font> XMPPConnection(<font color="green">"jabber.org"</font>);
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conn1.connect();
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<font color="gray"><i>// Create a connection to the jabber.org server on a specific port.</i></font>
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ConnectionConfiguration config = new ConnectionConfiguration(<font color="green">"jabber.org"</font>, 5222);
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Connection conn2 = <font color="navy"><b>new</b></font> XMPPConnection(config);
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conn2.connect();
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</pre></div>
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<p>Note that maximum security will be used when connecting to the server by default (and when possible),
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including use of TLS encryption. The ConnectionConfiguration class provides advanced control
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over the connection created, such as the ability to disable or require encryption. See
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<a href="connections.html">Connection Management</a> for full details.</p>
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<p>Once you've created a connection, you should login using a username and password
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with the <tt>Connection.login(String username, String password)</tt> method.
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Once you've logged in, you can being chatting with other users by creating
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new <tt>Chat</tt> or <tt>GroupChat</tt> objects.
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<p class="subheader">
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Working with the Roster
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</p>
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The roster lets you keep track of the availability (presence) of other users. Users
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can be organized into groups such as "Friends" and "Co-workers", and then you
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discover whether each user is online or offline.<p>
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Retrieve the roster using the <tt>Connection.getRoster()</tt> method. The roster
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class allows you to find all the roster entries, the groups they belong to, and the
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current presence status of each entry.
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<p class="subheader">
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Reading and Writing Packets
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</p>
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Each message to the XMPP server from a client is called a packet and is
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sent as XML. The <tt>org.jivesoftware.smack.packet</tt> package contains
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classes that encapsulate the three different basic packet types allowed by
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XMPP (message, presence, and IQ). Classes such as <tt>Chat</tt> and <tt>GroupChat</tt>
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provide higher-level constructs that manage creating and sending packets
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automatically, but you can also create and send packets directly. Below
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is a code example for changing your presence to let people know you're unavailable
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and "out fishing":<p>
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<div class="code">
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<pre>
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<font color="gray"><i>// Create a new presence. Pass in false to indicate we're unavailable.</i></font>
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Presence presence = new Presence(Presence.Type.unavailable);
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presence.setStatus(<font color="green">"Gone fishing"</font>);
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<font color="gray"><i>// Send the packet (assume we have a Connection instance called "con").</i></font>
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con.sendPacket(presence);
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</pre></div>
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<p>
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Smack provides two ways to read incoming packets: <tt>PacketListener</tt>, and
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<tt>PacketCollector</tt>. Both use <tt>PacketFilter</tt> instances to determine
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which packets should be processed. A packet listener is used for event style programming,
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while a packet collector has a result queue of packets that you can do
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polling and blocking operations on. So, a packet listener is useful when
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you want to take some action whenever a packet happens to come in, while a
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packet collector is useful when you want to wait for a specific packet
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to arrive. Packet collectors and listeners can be created using an
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Connection instance.
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<p><div class="footer">
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Copyright © Jive Software 2002-2008
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</div>
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