<p>XMPP4R是一个XMPP/Jabber的Ruby类库。它的目标是提供开发Jabber相关应用程序或者Ruby脚本的完整框架。</p>    <ul>     <li>完整面向对象</li>     <li>旨在XMPP协议兼容</li>     <li>Threaded, events-based</li>     <li>良好的单元测试和文档代码</li>     <li>Uses well-known and well-tested software like REXML, instead of reinventing the wheel</li>     <li>Very easy to extend</li>    </ul>    <p>安装方法：<code>gem install xmpp4r</code></p>    <p>示例代码：</p>    <pre class="brush:ruby; toolbar: true; auto-links: false;">  # Send a message to a friend, asking for authorization if necessary:   im = Jabber::Simple.new("user@example.com", "password")   im.deliver("friend@example.com", "Hey there friend!")    # Get received messages and print them out to the console:   im.received_messages { |msg| puts msg.body if msg.type == :chat }    # Send an authorization request to a user:   im.add("friend@example.com")    # Get presence updates from your friends, and print them out to the console:   # (admittedly, this one needs some work)   im.presence_updates { |update|     from     = update[0].jid.strip.to_s     status   = update[2].status     presence = update[2].show     puts "#{from} went #{presence}: #{status}"   end    # Remove a user from your contact list:   im.remove("unfriendly@example.com")    # See the Jabber::Simple documentation for more information.</pre>http://home.gna.org/xmpp4r/    <p></p>