HelloWorldServer.java

// Copyright (C) 2015 anduo
// All rights reserved
package com.anduo.nz.netty;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.serialization.ClassResolvers;
import io.netty.handler.codec.serialization.ObjectDecoder;
import io.netty.handler.codec.serialization.ObjectEncoder;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.util.SelfSignedCertificate;

/**
 * Summary: HelloWorldServer
 * Author : anduo@qq.com
 * Version: 1.0
 * Date   : 15/7/1
 * time   : 23:13
 */
public class HelloWorldServer {
    static final boolean SSL  = System.getProperty("ssl") != null;
    static final int     PORT = Integer.parseInt(System.getProperty("port", "8007"));

    public static void main(String[] args)
            throws Exception {
        // Configure SSL.
        final SslContext sslCtx;
        if (SSL) {
            SelfSignedCertificate ssc = new SelfSignedCertificate();
            sslCtx = SslContext.newServerContext(ssc.certificate(), ssc.privateKey());
        } else {
            sslCtx = null;
        }

        // Configure the server.
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap server = new ServerBootstrap();
            server.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class)
                  .option(ChannelOption.SO_BACKLOG, 100).handler(new LoggingHandler(LogLevel.INFO))
                  .childHandler(new ChannelInitializer<SocketChannel>() {
                      @Override
                      public void initChannel(SocketChannel ch)
                              throws Exception {
                          ChannelPipeline p = ch.pipeline();
                          if (sslCtx != null) {
                              p.addLast(sslCtx.newHandler(ch.alloc()));
                          }
                          p.addLast(new LoggingHandler(LogLevel.INFO));
                          p.addLast(new ObjectEncoder(),
                                    new ObjectDecoder(ClassResolvers.cacheDisabled(null)),
                                    new HelloWorldServerHandler());
                      }
                  });

            // Start the server.
            ChannelFuture f = server.bind(PORT).sync();

            // Wait until the server socket is closed.
            f.channel().closeFuture().sync();
        } finally {
            // Shut down all event loops to terminate all threads.
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}

class HelloWorldServerHandler extends ChannelInboundHandlerAdapter {

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        ctx.write("server write msg:" + msg);
    }

    @Override
    public void channelReadComplete(ChannelHandlerContext ctx) {
        ctx.flush();
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        // Close the connection when an exception is raised.
        cause.printStackTrace();
        ctx.close();
    }

    //当绑定到服务端的时候触发
    @Override
    public void channelActive(ChannelHandlerContext ctx)
            throws Exception {
        System.out.println("hello this is server!");
    }
}