netty 实现socket服务端编写

 import java.net.InetSocketAddress;

 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelInitializer;
 import io.netty.channel.ChannelOption;
 import io.netty.channel.EventLoopGroup;
 import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.channel.socket.SocketChannel;
 import io.netty.channel.socket.nio.NioServerSocketChannel;

 public class TimeServer {

     public static void main(String[] args) throws Exception{
         new TimeServer().bind("192.168.1.102", 8400);
     }

     public void bind(String addr,int port) {
         //配置服务端的nio线程组
         EventLoopGroup boosGroup=new NioEventLoopGroup();
         EventLoopGroup workerGroup=new NioEventLoopGroup();
         try {
             ServerBootstrap b=new ServerBootstrap();
             b.group(boosGroup,workerGroup);
             b.channel(NioServerSocketChannel.class).option(ChannelOption.SO_BACKLOG,1024)
             .childHandler(new ChildChannelHandler());
             //绑定端口，同步等待成功
             ChannelFuture f=b.bind(new InetSocketAddress(addr, port)).sync();
             //等等服务器端监听端口关闭
             f.channel().closeFuture().sync();
         } catch (Exception e) {
             // TODO: handle exception
         }finally{
             boosGroup.shutdownGracefully();
             workerGroup.shutdownGracefully();
         }
     }

     private class ChildChannelHandler extends ChannelInitializer<SocketChannel>{

         @Override
         protected void initChannel(SocketChannel ch) throws Exception {
             ch.pipeline().addLast(new TimeServerHandler());

         }

     }

 }

 import java.nio.ByteBuffer;
 import java.text.SimpleDateFormat;
 import java.util.Date;

 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelHandlerAdapter;
 import io.netty.channel.ChannelHandlerContext;

 public class TimeServerHandler extends ChannelHandlerAdapter {

     @Override
     public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
         ByteBuf buf=(ByteBuf)msg;
         byte[] bytes=new byte[buf.readableBytes()];
         buf.readBytes(bytes);
         String body=new String(bytes,"UTF-8");
         SimpleDateFormat  dateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
         String time=dateFormat.format(new Date());
         String res="来自与服务端的回应,时间:"+ time;
         ByteBuf resp=Unpooled.copiedBuffer(res.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();
     }

 }

这个比传统的nio好用多了，netty的版本为netty-all-5.0.0.Alpha1.jar

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