《Netty權威指南》（一）簡單的時間伺服器P69

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由於該書是基於Netty5編寫的範例代碼，而Netty5已經被官方廢棄。目前基於推薦版的4.1.12.Final在學習過程中，可能會出現個別介面不一致的情況。所以記錄可在4.1.12下編譯通過的代碼

 

  
package net.xjdsz.n;
  

  
import io.netty.bootstrap.ServerBootstrap;
  
import io.netty.buffer.ByteBuf;
  
import io.netty.buffer.Unpooled;
  
import io.netty.channel.*;
  
import io.netty.channel.nio.NioEventLoopGroup;
  
import io.netty.channel.socket.SocketChannel;
  
import io.netty.channel.socket.nio.NioServerSocketChannel;
  

  
import java.util.Date;
  

  
/**
  
 * Created by dingshuo on 2017/6/14.
  
 */
  
public class TimeServer {
  
 public void bind(int port) throws Exception{
  
 EventLoopGroup bossGroup=new NioEventLoopGroup();
  
 EventLoopGroup workerGroup=new NioEventLoopGroup();
  
 try{
  
 ServerBootstrap b=new ServerBootstrap();
  
 b.group(bossGroup,workerGroup)
  
 .channel(NioServerSocketChannel.class)
  
 .option(ChannelOption.SO_BACKLOG,1024)
  
 .childHandler(new ChannelInitializer<SocketChannel>() {
  
 @Override
  
 protected void initChannel(SocketChannel socketChannel) throws Exception {
  
 socketChannel.pipeline().addLast(new ChannelInboundHandlerAdapter(){
  
 @Override
  
 public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
  
 ByteBuf buf=(ByteBuf)msg;
  
 byte[] req=new byte[buf.readableBytes()];
  
 buf.readBytes(req);
  
 String body=new String(req,"UTF-8");
  
 System.out.println("收到資料:"+body);
  
 String currentTime=new Date(System.currentTimeMillis()).toString();
  
 ByteBuf resp= Unpooled.copiedBuffer(currentTime.getBytes());
  
 ctx.write(resp);
  
 }
  

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

  
 @Override
  
 public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
  
 ctx.close();
  
 }
  
 });
  
 }
  
 });
  

  
 //綁定連接埠，同步等待成功
  
 ChannelFuture f=b.bind(port).sync();
  

  
 //等待服務端監聽連接埠關閉
  
 f.channel().closeFuture().sync();
  
 }finally {
  
 //退出，釋放資源
  
 bossGroup.shutdownGracefully();
  
 workerGroup.shutdownGracefully();
  
 }
  
 }
  

  
 public static void main(String[] args) throws Exception{
  
 TimeServer timeServer=new TimeServer();
  
 timeServer.bind(2000);
  
 }
  
}
 

《Netty權威指南》（一）簡單的時間伺服器P69