223efc5f99
Motivation:
The examples have not been updated since long time ago, showing various
issues fixed in this commit.
Modifications:
- Overall simplification to reduce LoC
- Use system properties to get options instead of parsing args.
- Minimize option validation
- Just use System.out/err instead of Logger
- Do not pass config as parameters - just access it directly
- Move the main logic to main(String[]) instead of creating a new
instance meaninglessly
- Update netty-build-21 to make checkstyle not complain
- Remove 'throws Exception' clause if possible
- Line wrap at 120 (previously at 80)
- Add an option to enable SSL for most examples
- Use ChannelFuture.sync() instead of await()
- Use System.out for the actual result. Use System.err otherwise.
- Delete examples that are not very useful:
- applet
- websocket/html5
- websocketx/sslserver
- localecho/multithreaded
- Add run-example.sh which simplifies launching an example from command
line
- Rewrite FileServer example
Result:
Shorter and simpler examples. A user can focus more on what it actually
does than miscellaneous stuff. A user can launch an example very
easily.
80 lines
3.1 KiB
Java
80 lines
3.1 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.securechat;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.SimpleChannelInboundHandler;
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import io.netty.channel.group.ChannelGroup;
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import io.netty.channel.group.DefaultChannelGroup;
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import io.netty.handler.ssl.SslHandler;
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import io.netty.util.concurrent.Future;
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import io.netty.util.concurrent.GenericFutureListener;
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import io.netty.util.concurrent.GlobalEventExecutor;
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import java.net.InetAddress;
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/**
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* Handles a server-side channel.
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*/
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public class SecureChatServerHandler extends SimpleChannelInboundHandler<String> {
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static final ChannelGroup channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);
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@Override
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public void channelActive(final ChannelHandlerContext ctx) {
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// Once session is secured, send a greeting and register the channel to the global channel
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// list so the channel received the messages from others.
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ctx.pipeline().get(SslHandler.class).handshakeFuture().addListener(
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new GenericFutureListener<Future<Channel>>() {
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@Override
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public void operationComplete(Future<Channel> future) throws Exception {
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ctx.writeAndFlush(
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"Welcome to " + InetAddress.getLocalHost().getHostName() + " secure chat service!\n");
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ctx.writeAndFlush(
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"Your session is protected by " +
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ctx.pipeline().get(SslHandler.class).engine().getSession().getCipherSuite() +
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" cipher suite.\n");
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channels.add(ctx.channel());
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}
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});
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}
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@Override
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public void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
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// Send the received message to all channels but the current one.
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for (Channel c: channels) {
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if (c != ctx.channel()) {
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c.writeAndFlush("[" + ctx.channel().remoteAddress() + "] " + msg + '\n');
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} else {
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c.writeAndFlush("[you] " + msg + '\n');
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}
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}
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// Close the connection if the client has sent 'bye'.
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if ("bye".equals(msg.toLowerCase())) {
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ctx.close();
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}
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}
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@Override
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public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
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cause.printStackTrace();
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ctx.close();
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}
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}
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