Adding WebSocket Example using WebSocketServerProtocolHandler.

This commit is contained in:
Daniel Bevenius 2012-11-25 10:22:44 +01:00 committed by Norman Maurer
parent dbbc6ad73f
commit b1cd953d02
5 changed files with 200 additions and 0 deletions

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/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License,
* version 2.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*/
package io.netty.example.http.websocketx.html5;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundMessageHandlerAdapter;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
public class CustomTextFrameHandler extends ChannelInboundMessageHandlerAdapter<TextWebSocketFrame> {
@Override
public void messageReceived(ChannelHandlerContext ctx, TextWebSocketFrame frame) throws Exception {
String request = frame.getText();
ctx.channel().write(new TextWebSocketFrame(request.toUpperCase()));
}
}

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/*
* Copyright 2012 The Netty Project
*
* The Netty Project licenses this file to you under the Apache License, version
* 2.0 (the "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package io.netty.example.http.websocketx.html5;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpChunkAggregator;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;
import java.net.InetSocketAddress;
/**
* A WebSocket Server that respondes to requests at:
*
* <pre>
* http://localhost:8080/websocket
* </pre>
*
* The example differs from many of the other examples in Netty in that is does
* not have an acomponying client. Instead a html page is provided that
* interacts with this server. <br>
* Open up the following file a web browser that supports WebSocket's:
*
* <pre>
* example/src/main/resources/websocketx/html5/websocket.html
* </pre>
*
* The html page is very simple were you simply enter some text and the server
* will echo the same text back, but in uppercase. You, also see status messages
* in the "Response From Server" area when client has connected, disconnected
* etc.
*
*/
public class WebSocketServer {
private final int port;
public WebSocketServer(int port) {
this.port = port;
}
public void run() throws Exception {
final ServerBootstrap sb = new ServerBootstrap();
try {
sb.group(new NioEventLoopGroup(), new NioEventLoopGroup())
.channel(NioServerSocketChannel.class)
.localAddress(new InetSocketAddress(port))
.childHandler(new ChannelInitializer<SocketChannel>() {
@Override
public void initChannel(final SocketChannel ch) throws Exception {
ch.pipeline().addLast(
new HttpRequestDecoder(),
new HttpChunkAggregator(65536),
new HttpResponseEncoder(),
new WebSocketServerProtocolHandler("/websocket"),
new CustomTextFrameHandler());
}
});
final Channel ch = sb.bind().sync().channel();
System.out.println("Web socket server started at port " + port);
ch.closeFuture().sync();
} finally {
sb.shutdown();
}
}
public static void main(String[] args) throws Exception {
int port;
if (args.length > 0) {
port = Integer.parseInt(args[0]);
} else {
port = 8080;
}
new WebSocketServer(port).run();
}
}

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textarea {
width: 500px;
height: 300px;
}

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(function() {
var Sock = function() {
var socket;
if (!window.WebSocket) {
window.WebSocket = window.MozWebSocket;
}
if (window.WebSocket) {
socket = new WebSocket("ws://localhost:8080/websocket");
socket.onopen = onopen;
socket.onmessage = onmessage;
socket.onclose = onclose;
} else {
alert("Your browser does not support Web Socket.");
}
function onopen(event) {
getTextAreaElement().value = "Web Socket opened!";
}
function onmessage(event) {
appendTextArea(event.data);
}
function onclose(event) {
appendTextArea("Web Socket closed");
}
function appendTextArea(newData) {
var el = getTextAreaElement();
el.value = el.value + '\n' + newData;
}
function getTextAreaElement() {
return document.getElementById('responseText');
}
function send(e) {
e.preventDefault();
if (window.WebSocket) {
if (socket.readyState == WebSocket.OPEN) {
socket.send(event.target.message.value);
} else {
alert("The socket is not open.");
}
}
}
document.forms.inputform.addEventListener('submit', send, false);
}
window.addEventListener('load', function() { new Sock(); }, false);
})();

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Web Socket Example</title>
<link rel="stylesheet" href="css/socket.css">
<script src="js/socket.js"></script>
</head>
<body>
<h1>Enter a message</h1>
<form name="inputform">
<input type="text" name="message" id="message" placeholder="Enter text to be sent" autofocus>
<input type="submit" value="Send Web Socket Data">
</form>
<h2>Repsonse from Server</h2>
<textarea id="responseText"></textarea>
</body>
</html>