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.
84 lines
3.2 KiB
Java
84 lines
3.2 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.echo;
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import io.netty.bootstrap.Bootstrap;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelInitializer;
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import io.netty.channel.ChannelOption;
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import io.netty.channel.ChannelPipeline;
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import io.netty.channel.EventLoopGroup;
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import io.netty.channel.nio.NioEventLoopGroup;
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import io.netty.channel.socket.SocketChannel;
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import io.netty.channel.socket.nio.NioSocketChannel;
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import io.netty.handler.logging.LogLevel;
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import io.netty.handler.logging.LoggingHandler;
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import io.netty.handler.ssl.SslContext;
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import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
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/**
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* Sends one message when a connection is open and echoes back any received
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* data to the server. Simply put, the echo client initiates the ping-pong
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* traffic between the echo client and server by sending the first message to
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* the server.
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*/
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public final class EchoClient {
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static final boolean SSL = System.getProperty("ssl") != null;
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static final String HOST = System.getProperty("host", "127.0.0.1");
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static final int PORT = Integer.parseInt(System.getProperty("port", "8007"));
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static final int SIZE = Integer.parseInt(System.getProperty("size", "256"));
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public static void main(String[] args) throws Exception {
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// Configure SSL.git
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final SslContext sslCtx;
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if (SSL) {
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sslCtx = SslContext.newClientContext(InsecureTrustManagerFactory.INSTANCE);
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} else {
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sslCtx = null;
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}
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// Configure the client.
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EventLoopGroup group = new NioEventLoopGroup();
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try {
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Bootstrap b = new Bootstrap();
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b.group(group)
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.channel(NioSocketChannel.class)
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.option(ChannelOption.TCP_NODELAY, true)
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.handler(new ChannelInitializer<SocketChannel>() {
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@Override
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public void initChannel(SocketChannel ch) throws Exception {
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ChannelPipeline p = ch.pipeline();
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if (sslCtx != null) {
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p.addLast(sslCtx.newHandler(ch.alloc(), HOST, PORT));
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}
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//p.addLast(new LoggingHandler(LogLevel.INFO));
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p.addLast(new EchoClientHandler());
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}
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});
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// Start the client.
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ChannelFuture f = b.connect(HOST, PORT).sync();
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// Wait until the connection is closed.
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f.channel().closeFuture().sync();
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} finally {
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// Shut down the event loop to terminate all threads.
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group.shutdownGracefully();
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}
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}
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}
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