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| <title>Using WebSocketListener</title><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><meta name="keywords" content="jetty, servlet, servlet-api, cometd, http, websocket, eclipse, maven, java, server, software"><link rel="home" href="index.html" title="Jetty"><link rel="up" href="websocket-jetty.html" title="Chapter 27. Jetty Websocket API"><link rel="prev" href="jetty-websocket-api-annotations.html" title="Using WebSocket Annotations"><link rel="next" href="jetty-websocket-api-adapter.html" title="Using the WebSocketAdapter"><link xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" rel="shortcut icon" href="images/favicon.ico"><link rel="stylesheet" href="css/highlighter/foundation.css"><script src="js/highlight.pack.js"></script><script> |
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| Version: 9.4.28-SNAPSHOT</span></td><td style="width: 50%"></td></tr></table><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Using WebSocketListener</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="jetty-websocket-api-annotations.html"><i class="fa fa-chevron-left" aria-hidden="true"></i> Previous</a> </td><th width="60%" align="center">Chapter 27. Jetty Websocket API<br><a accesskey="p" href="index.html"><i class="fa fa-home" aria-hidden="true"></i> Home</a></th><td width="20%" align="right"> <a accesskey="n" href="jetty-websocket-api-adapter.html">Next <i class="fa fa-chevron-right" aria-hidden="true"></i></a></td></tr></table><hr></div><div xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times" class="jetty-callout"><h5 class="callout"><a href="http://www.webtide.com/">Contact the core Jetty developers at |
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| </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="jetty-websocket-api-listener"></a>Using WebSocketListener</h2></div></div></div><p>The basic form of a WebSocket using the <a class="link" href="http://www.eclipse.org/jetty/javadoc/9.4.28-SNAPSHOT/org/eclipse/jetty/websocket/api/WebSocketListener.html" target="_top"><code class="literal">org.eclipse.jetty.websocket.api.WebSocketListener</code></a> for incoming events.</p><pre xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><code>// |
| // ======================================================================== |
| // Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package examples.echo; |
| |
| import org.eclipse.jetty.websocket.api.Session; |
| import org.eclipse.jetty.websocket.api.WebSocketListener; |
| |
| /** |
| * Example EchoSocket using Listener. |
| */ |
| public class ListenerEchoSocket implements WebSocketListener |
| { |
| private Session outbound; |
| |
| @Override |
| public void onWebSocketBinary(byte[] payload, int offset, int len) |
| { |
| /* only interested in text messages */ |
| } |
| |
| @Override |
| public void onWebSocketClose(int statusCode, String reason) |
| { |
| this.outbound = null; |
| } |
| |
| @Override |
| public void onWebSocketConnect(Session session) |
| { |
| this.outbound = session; |
| } |
| |
| @Override |
| public void onWebSocketError(Throwable cause) |
| { |
| cause.printStackTrace(System.err); |
| } |
| |
| @Override |
| public void onWebSocketText(String message) |
| { |
| if ((outbound != null) && (outbound.isOpen())) |
| { |
| System.out.printf("Echoing back message [%s]%n", message); |
| // echo the message back |
| outbound.getRemote().sendString(message, null); |
| } |
| } |
| }</code></pre><p>This is by far the most basic and best performing (speed and memory wise) WebSocket implementation you can create. |
| If the listener is too much work for you, you can instead opt for the WebSocketAdapter</p></div><script type="text/javascript"> |
| SyntaxHighlighter.all() |
| </script><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="jetty-websocket-api-annotations.html"><i class="fa fa-chevron-left" aria-hidden="true"></i> Previous</a> </td><td width="20%" align="center"><a accesskey="u" href="websocket-jetty.html"><i class="fa fa-chevron-up" aria-hidden="true"></i> Top</a></td><td width="40%" align="right"> <a accesskey="n" href="jetty-websocket-api-adapter.html">Next <i class="fa fa-chevron-right" aria-hidden="true"></i></a></td></tr><tr><td width="40%" align="left" valign="top">Using WebSocket Annotations </td><td width="20%" align="center"><a accesskey="h" href="index.html"><i class="fa fa-home" aria-hidden="true"></i> Home</a></td><td width="40%" align="right" valign="top"> Using the WebSocketAdapter</td></tr></table></div><p xmlns:jfetch="java:org.eclipse.jetty.xslt.tools.JavaSourceFetchExtension" xmlns:fetch="java:org.eclipse.jetty.xslt.tools.SourceFetchExtension" xmlns:d="http://docbook.org/ns/docbook" xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0" xmlns:xslthl="http://xslthl.sf.net" xmlns:gcse="http://www.google.com" xmlns:date="http://exslt.org/dates-and-times"><div class="jetty-callout"> |
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| <span class="website"><i class="fa fa-github" aria-hidden="true"></i> Github!</span></a></span><span style="float: right"><i>(Generated: 2020-03-10)</i></span></div></p></body></html> |
