netty 實現socket服務端編寫

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) {
        //配置服務端的nio線程組
        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());
            //綁定端口，同步等待成功
            ChannelFuture f=b.bind(new InetSocketAddress(addr, port)).sync();
            //等等服務器端監聽端口關閉
            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="來自與服務端的回應,時間:"+ 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();
    }

    

    
}

 

這個比傳統的nio好用多了，netty的版本為netty-all-5.0.0.Alpha1.jar

 

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