mirror of
https://github.com/vanitasvitae/Smack.git
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200 lines
8.6 KiB
HTML
200 lines
8.6 KiB
HTML
<html>
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<head>
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<title>XHTML Support</title>
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<link rel="stylesheet" type="text/css" href="style.css" />
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</head>
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<body>
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<div class="header">XHTML Messages</div><p>
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Provides the ability to send and receive formatted messages using XHTML.
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<p>Follow these links to learn how to compose, send, receive and discover support for
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XHTML messages:</p>
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<ul>
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<li><a href="#xhtmlcompose">Compose an XHTML Message</a></li>
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<li><a href="#xhtmlsend">Send an XHTML Message</a></li>
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<li><a href="#xhtmlreceive">Receive an XHTML Message</a></li>
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<li><a href="#xhtmldiscover">Discover support for XHTML Messages</a></li>
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</ul>
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<b>XEP related:</b> <a href="http://www.xmpp.org/extensions/xep-0071.html">XEP-71</a>
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<hr>
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<div class="subheader"><a name="xhtmlcompose">Compose an XHTML Message</a></div><p>
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<b>Description</b><p>
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The first step in order to send an XHTML message is to compose it. Smack provides a special
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class that helps to build valid XHTML messages hiding any low level complexity.
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For special situations, advanced users may decide not to use the helper class and generate
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the XHTML by themselves. Even for these situations Smack provides a well defined entry point
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in order to add the generated XHTML content to a given message.</p>
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<p>
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Note: not all clients are able to view XHTML formatted messages. Therefore,
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it's recommended that you include a normal body in that message that is either an
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unformatted version of the text or a note that XHTML support is required
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to view the message contents.</p>
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<b>Usage</b><p>
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Create an instance of <i><b>XHTMLText</b></i> specifying the style and language of the body.
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You can add several XHTML bodies to the message but each body should be for a different language.
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Once you have an XHTMLText you can start to append tags and text to it. In order to append tags there
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are several messages that you can use. For each XHTML defined tag there is a message that you can send.
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In order to add text you can send the message <b>#append(String textToAppend)</b>.</p>
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<p>After you have configured the XHTML text, the last step you have to do is to add the XHTML text
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to the message you want to send. If you decided to create the XHTML text by yourself, you will have to
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follow this last step too. In order to add the XHTML text to the message send the message
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<b>#addBody(Message message, String body)</b> to the <i><b>XHTMLManager</b></i> class where <i>message</i>
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is the message that will receive the XHTML body and <i>body</i> is the string to add as an XHTML body to
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the message.</b></p>
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<b>Example</b><p>
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In this example we can see how to compose the following XHTML message: <br>
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<font color="#0000FF"><body><p style='font-size:large'>Hey John, this is my new <span
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style='color:green'>green</span><em>!!!!</em></p></body></font>
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<blockquote>
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<pre> <font color="#3f7f5f">// Create a message to send</font>
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Message msg = chat.createMessage();
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msg.setSubject(<font color="#0000FF">"Any subject you want"</font>);
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msg.setBody(<font color="#0000FF">"Hey John, this is my new green!!!!"</font>);
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<font color="#3f7f5f">// Create an XHTMLText to send with the message</font>
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XHTMLText xhtmlText = new XHTMLText(null, null);
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xhtmlText.appendOpenParagraphTag(<font color="#0000FF">"font-size:large"</font>);
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xhtmlText.append(<font color="#0000FF">"Hey John, this is my new "</font>);
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xhtmlText.appendOpenSpanTag(<font color="#0000FF">"color:green"</font>);
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xhtmlText.append(<font color="#0000FF">"green"</font>);
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xhtmlText.appendCloseSpanTag();
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xhtmlText.appendOpenEmTag();
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xhtmlText.append(<font color="#0000FF">"!!!!"</font>);
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xhtmlText.appendCloseEmTag();
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xhtmlText.appendCloseParagraphTag();
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<font color="#3f7f5f">// Add the XHTML text to the message</font>
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XHTMLManager.addBody(msg, xhtmlText.toString());
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</pre>
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</blockquote>
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<hr>
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<div class="subheader"><a name="xhtmlsend">Send an XHTML Message</a></div><p>
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<b>Description</b><p>
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After you have composed an XHTML message you will want to send it. Once you have added
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the XHTML content to the message you want to send you are almost done. The last step is to send
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the message as you do with any other message.</p>
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<b>Usage</b><p>
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An XHTML message is like any regular message, therefore to send the message you can follow
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the usual steps you do in order to send a message. For example, to send a message as part
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of a chat just use the message <b>#send(Message)</b> of <i><b>Chat</b></i> or you can use
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the message <b>#send(Packet)</b> of <i><b>XMPPConnection</b></i>.</p>
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<b>Example</b><p>
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In this example we can see how to send a message with XHTML content as part of a chat.
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<blockquote>
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<pre> <font color="#3f7f5f">// Create a message to send</font>
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Message msg = chat.createMessage();
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<font color="#3f7f5f">// Obtain the XHTML text to send from somewhere</font>
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String xhtmlBody = getXHTMLTextToSend();
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<font color="#3f7f5f">// Add the XHTML text to the message</font>
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XHTMLManager.addBody(msg, xhtmlBody);
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<font color="#3f7f5f">// Send the message that contains the XHTML</font>
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chat.sendMessage(msg);
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</pre>
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</blockquote>
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<hr>
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<div class="subheader"><a name="xhtmlreceive">Receive an XHTML Message</a></div><p>
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<b>Description</b><p>
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It is also possible to obtain the XHTML content from a received message. Remember
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that the specification defines that a message may contain several XHTML bodies
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where each body should be for a different language.</p>
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<b>Usage</b><p>
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To get the XHTML bodies of a given message just send the message <b>#getBodies(Message)</b>
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to the class <i><b>XHTMLManager</b></i>. The answer of this message will be an
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<i><b>Iterator</b></i> with the different XHTML bodies of the message or null if none.</p>
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<b>Example</b><p>
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In this example we can see how to create a PacketListener that obtains the XHTML bodies of any received message.
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<blockquote>
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<pre> <font color="#3f7f5f">// Create a listener for the chat and display any XHTML content</font>
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PacketListener packetListener = new PacketListener() {
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public void processPacket(Packet packet) {
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Message message = (Message) packet;
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<font color="#3f7f5f">// Obtain the XHTML bodies of the message</font>
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Iterator it = XHTMLManager.getBodies(message);
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if (it != null) {
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<font color="#3f7f5f">// Display the bodies on the console</font>
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while (it.hasNext()) {
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String body = (String) it.next();
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System.out.println(body);
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}
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}
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};
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chat.addMessageListener(packetListener);
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</pre>
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</blockquote>
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<hr>
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<div class="subheader"><a name="xhtmldiscover">Discover support for XHTML Messages</a></div><p>
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<b>Description</b><p>
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Before you start to send XHTML messages to a user you should discover if the user supports XHTML messages.
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There are two ways to achieve the discovery, explicitly and implicitly. Explicit is when you first try
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to discover if the user supports XHTML before sending any XHTML message. Implicit is when you send
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XHTML messages without first discovering if the conversation partner's client supports XHTML and depenging on
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the answer (normal message or XHTML message) you find out if the user supports XHTML messages or not. This
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section explains how to explicitly discover for XHTML support.</p>
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<b>Usage</b><p>
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In order to discover if a remote user supports XHTML messages send <b>#isServiceEnabled(XMPPConnection
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connection, String userID)</b> to the class <i><b>XHTMLManager</b></i> where connection is the connection
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to use to perform the service discovery and userID is the user to check (A fully qualified xmpp ID,
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e.g. jdoe@example.com). This message will return true if the specified user handles XHTML messages.</p>
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<b>Example</b><p>
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In this example we can see how to discover if a remote user supports XHTML Messages.
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<blockquote>
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<pre> Message msg = chat.createMessage();
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<font color="#3f7f5f">// Include a normal body in the message</font>
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msg.setBody(getTextToSend());
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<font color="#3f7f5f">// Check if the other user supports XHTML messages</font>
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if (XHTMLManager.isServiceEnabled(connection, chat.getParticipant())) {
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<font color="#3f7f5f">// Obtain the XHTML text to send from somewhere</font>
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String xhtmlBody = getXHTMLTextToSend();
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<font color="#3f7f5f">// Include an XHTML body in the message</font>
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XHTMLManager.addBody(msg, xhtmlBody);
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}
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<font color="#3f7f5f">// Send the message</font>
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chat.sendMessage(msg);
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</pre>
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</blockquote>
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</body>
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</html>
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