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16 package io.netty.example.echo;
17
18 import io.netty.bootstrap.ServerBootstrap;
19 import io.netty.channel.ChannelFuture;
20 import io.netty.channel.ChannelInitializer;
21 import io.netty.channel.ChannelOption;
22 import io.netty.channel.ChannelPipeline;
23 import io.netty.channel.EventLoopGroup;
24 import io.netty.channel.nio.NioEventLoopGroup;
25 import io.netty.channel.socket.SocketChannel;
26 import io.netty.channel.socket.nio.NioServerSocketChannel;
27 import io.netty.handler.logging.LogLevel;
28 import io.netty.handler.logging.LoggingHandler;
29 import io.netty.handler.ssl.SslContext;
30 import io.netty.handler.ssl.SslContextBuilder;
31 import io.netty.handler.ssl.util.SelfSignedCertificate;
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36 public final class EchoServer {
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38 static final boolean SSL = System.getProperty("ssl") != null;
39 static final int PORT = Integer.parseInt(System.getProperty("port", "8007"));
40
41 public static void main(String[] args) throws Exception {
42
43 final SslContext sslCtx;
44 if (SSL) {
45 SelfSignedCertificate ssc = new SelfSignedCertificate();
46 sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey()).build();
47 } else {
48 sslCtx = null;
49 }
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52 EventLoopGroup bossGroup = new NioEventLoopGroup(1);
53 EventLoopGroup workerGroup = new NioEventLoopGroup();
54 final EchoServerHandler serverHandler = new EchoServerHandler();
55 try {
56 ServerBootstrap b = new ServerBootstrap();
57 b.group(bossGroup, workerGroup)
58 .channel(NioServerSocketChannel.class)
59 .option(ChannelOption.SO_BACKLOG, 100)
60 .handler(new LoggingHandler(LogLevel.INFO))
61 .childHandler(new ChannelInitializer<SocketChannel>() {
62 @Override
63 public void initChannel(SocketChannel ch) throws Exception {
64 ChannelPipeline p = ch.pipeline();
65 if (sslCtx != null) {
66 p.addLast(sslCtx.newHandler(ch.alloc()));
67 }
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69 p.addLast(serverHandler);
70 }
71 });
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74 ChannelFuture f = b.bind(PORT).sync();
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77 f.channel().closeFuture().sync();
78 } finally {
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80 bossGroup.shutdownGracefully();
81 workerGroup.shutdownGracefully();
82 }
83 }
84 }