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| <title>Jetty WebSocket Client API</title><link rel="stylesheet" type="text/css" href="css/docbook.css"><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"><meta name="keywords" content="jetty, servlet, servlet-api, cometd, http, websocket, eclipse, maven, java, server, software"><link rel="home" href="index.html" title="Jetty : The Definitive Reference"><link rel="up" href="websocket-jetty.html" title="Chapter 29. Jetty Websocket API"><link rel="prev" href="jetty-websocket-server-api.html" title="Jetty WebSocket Server API"><link rel="next" href="websocket-java.html" title="Chapter 30. Java Websocket API"><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"><script type="text/javascript" src="js/shCore.js"></script><script type="text/javascript" src="js/shBrushJava.js"></script><script type="text/javascript" src="js/shBrushXml.js"></script><script type="text/javascript" src="js/shBrushBash.js"></script><script type="text/javascript" src="js/shBrushJScript.js"></script><script type="text/javascript" src="js/shBrushSql.js"></script><script type="text/javascript" src="js/shBrushProperties.js"></script><script type="text/javascript" src="js/shBrushPlain.js"></script><link type="text/css" rel="stylesheet" href="css/shCore.css"><link type="text/css" rel="stylesheet" href="css/shThemeEclipse.css"><link type="text/css" rel="stylesheet" href="css/font-awesome.min.css"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table 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"><tr><td style="width: 25%"><a href="http://www.eclipse.org/jetty"><img src="images/jetty-header-logo.png" alt="Jetty Logo"></a><br><span style="font-size: small"> |
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| <span class="website">www.webtide.com</span></a></h5><p> |
| private support for your internal/customer projects ... custom extensions and distributions ... versioned snapshots for indefinite support ... |
| scalability guidance for your apps and Ajax/Comet projects ... development services from 1 day to full product delivery |
| </p></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="jetty-websocket-client-api"></a>Jetty WebSocket Client API</h2></div></div></div><div class="toc"><dl><dt><span class="section"><a href="jetty-websocket-client-api.html#d0e22111">The WebSocketClient</a></span></dt></dl></div><p>Jetty also provides a Jetty WebSocket Client Library to write make |
| talking to WebSocket servers easier.</p><p>To use the Jetty WebSocket Client on your own Java project you will |
| need the following maven artifacts.</p><p><script type="syntaxhighlighter" class="brush: xml;toolbar: false"> |
| <![CDATA[<dependency> |
| <groupId>org.eclipse.jetty.websocket</groupId> |
| <artifactId>websocket-client</artifactId> |
| <version>${project.version}</version> |
| </dependency>]]> |
| </script></p><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="d0e22111"></a>The WebSocketClient</h3></div></div></div><p>To use the WebSocketClient you will need to hook up a WebSocket |
| object instance to a specific destination WebSocket URI.</p><div class="example"><a name="d0e22116"></a><p class="title"><b>Example 29.19. SimpleEchoClient.java</b></p><div class="example-contents"><script type="syntaxhighlighter" class="brush: java;toolbar: false"> |
| <![CDATA[package examples; |
| |
| import java.net.URI; |
| import java.util.concurrent.TimeUnit; |
| import org.eclipse.jetty.websocket.client.ClientUpgradeRequest; |
| import org.eclipse.jetty.websocket.client.WebSocketClient; |
| |
| /** |
| * Example of a simple Echo Client. |
| */ |
| public class SimpleEchoClient { |
| |
| public static void main(String[] args) { |
| String destUri = "ws://echo.websocket.org"; |
| if (args.length > 0) { |
| destUri = args[0]; |
| } |
| WebSocketClient client = new WebSocketClient(); |
| SimpleEchoSocket socket = new SimpleEchoSocket(); |
| try { |
| client.start(); |
| URI echoUri = new URI(destUri); |
| ClientUpgradeRequest request = new ClientUpgradeRequest(); |
| client.connect(socket, echoUri, request); |
| System.out.printf("Connecting to : %s%n", echoUri); |
| socket.awaitClose(5, TimeUnit.SECONDS); |
| } catch (Throwable t) { |
| t.printStackTrace(); |
| } finally { |
| try { |
| client.stop(); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| } |
| } |
| } |
| ]]> |
| </script></div></div><br class="example-break"><p>The above example connects to a remote WebSocket server and hands |
| off a SimpleEchoSocket to perform the logic on the websocket once |
| connected, waiting for the socket to register that it has closed.</p><div class="example"><a name="d0e22124"></a><p class="title"><b>Example 29.20. SimpleEchoSocket.java</b></p><div class="example-contents"><script type="syntaxhighlighter" class="brush: java;toolbar: false"> |
| <![CDATA[package examples; |
| |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.Future; |
| import java.util.concurrent.TimeUnit; |
| import org.eclipse.jetty.websocket.api.Session; |
| import org.eclipse.jetty.websocket.api.StatusCode; |
| import org.eclipse.jetty.websocket.api.annotations.OnWebSocketClose; |
| import org.eclipse.jetty.websocket.api.annotations.OnWebSocketConnect; |
| import org.eclipse.jetty.websocket.api.annotations.OnWebSocketMessage; |
| import org.eclipse.jetty.websocket.api.annotations.WebSocket; |
| |
| /** |
| * Basic Echo Client Socket |
| */ |
| @WebSocket(maxTextMessageSize = 64 * 1024) |
| public class SimpleEchoSocket { |
| |
| private final CountDownLatch closeLatch; |
| |
| @SuppressWarnings("unused") |
| private Session session; |
| |
| public SimpleEchoSocket() { |
| this.closeLatch = new CountDownLatch(1); |
| } |
| |
| public boolean awaitClose(int duration, TimeUnit unit) throws InterruptedException { |
| return this.closeLatch.await(duration, unit); |
| } |
| |
| @OnWebSocketClose |
| public void onClose(int statusCode, String reason) { |
| System.out.printf("Connection closed: %d - %s%n", statusCode, reason); |
| this.session = null; |
| this.closeLatch.countDown(); |
| } |
| |
| @OnWebSocketConnect |
| public void onConnect(Session session) { |
| System.out.printf("Got connect: %s%n", session); |
| this.session = session; |
| try { |
| Future<Void> fut; |
| fut = session.getRemote().sendStringByFuture("Hello"); |
| fut.get(2, TimeUnit.SECONDS); |
| fut = session.getRemote().sendStringByFuture("Thanks for the conversation."); |
| fut.get(2, TimeUnit.SECONDS); |
| session.close(StatusCode.NORMAL, "I'm done"); |
| } catch (Throwable t) { |
| t.printStackTrace(); |
| } |
| } |
| |
| @OnWebSocketMessage |
| public void onMessage(String msg) { |
| System.out.printf("Got msg: %s%n", msg); |
| } |
| } |
| ]]> |
| </script></div></div><br class="example-break"><p>When the SimpleEchoSocket connects, it sends 2 Text messages and |
| then closes the socket.</p><p>The onMessage(String msg) receives the responses from the remote |
| server WebSocket and outputs them to the console.</p></div></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-server-api.html"><i class="icon-chevron-left"></i> Previous</a> </td><td width="20%" align="center"><a accesskey="u" href="websocket-jetty.html"><i class="icon-chevron-up"></i> Top</a></td><td width="40%" align="right"> <a accesskey="n" href="websocket-java.html">Next <i class="icon-chevron-right"></i></a></td></tr><tr><td width="40%" align="left" valign="top">Jetty WebSocket Server API </td><td width="20%" align="center"><a accesskey="h" href="index.html"><i class="icon-home"></i> Home</a></td><td width="40%" align="right" valign="top"> Chapter 30. Java Websocket API</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"> |
| See an error or something missing? |
| <span class="callout"><a href="http://github.com/jetty-project/jetty-documentation">Contribute to this documentation at |
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