初版

zengh

2021-06-03 723946c6b272e5aa4c7ec110ff1395f6c2b23e89

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package org.springblade.jfpt.nettyTcpServer;
 
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.ServerSocketChannel;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.util.ReferenceCountUtil;
 
 
public class TcpServer {
    private int port;
    private ServerSocketChannel serverSocketChannel;
 
    public TcpServer(int port){
        this.port = port;
        bind();
    }
 
    private void bind() {
        Thread thread = new Thread(new Runnable() {
            @Override
            public void run() {
                //服务端要建立两个group，一个负责接收客户端的连接，一个负责处理数据传输
                //连接处理group
                EventLoopGroup boss = new NioEventLoopGroup();
                //事件处理group
                EventLoopGroup worker = new NioEventLoopGroup();
                ServerBootstrap bootstrap = new ServerBootstrap();
                // 绑定处理group
                bootstrap.group(boss, worker).channel(NioServerSocketChannel.class)
                    //保持连接数
                    .option(ChannelOption.SO_BACKLOG, 30)
                    //设置缓冲区大小
                    .option(ChannelOption.SO_RCVBUF, 1024*1024)
                    .option(ChannelOption.SO_SNDBUF, 1024*1024)
                    //有数据立即发送
                    .option(ChannelOption.TCP_NODELAY, true)
                    //保持连接
                    .childOption(ChannelOption.SO_KEEPALIVE, true)
                    .childOption(ChannelOption.RCVBUF_ALLOCATOR, new FixedRecvByteBufAllocator(1024*1024))
                    .childHandler(new NettyChannelHandler());
 
                //绑定端口，同步等待成功
                ChannelFuture future;
                try {
                    future = bootstrap.bind(port).sync();
                    if (future.isSuccess()) {
                        serverSocketChannel = (ServerSocketChannel) future.channel();
                        System.out.println("服务端启动成功，端口："+port);
                    } else {
                        System.out.println("服务端启动失败！");
                    }
 
                    //等待服务监听端口关闭,就是由于这里会将线程阻塞，导致无法发送信息，所以我这里开了线程
                    future.channel().closeFuture().sync();
                } catch (Exception e) {
                    e.printStackTrace();
                }
                finally {
                    //优雅地退出，释放线程池资源
                    boss.shutdownGracefully();
                    worker.shutdownGracefully();
 
                }
            }
        });
        thread.start();
    }
 
 
 
    private class NettyChannelHandler extends ChannelInitializer<SocketChannel> {
 
        @Override
        protected void initChannel(SocketChannel socketChannel)
            throws Exception {
            ByteBuf delimiter = Unpooled.copiedBuffer("}".getBytes());
            socketChannel.pipeline().addLast( new DelimiterBasedFrameDecoder(200000,delimiter));
            socketChannel.pipeline().addLast(new TcpServerHandler());
        }
    }
 
}