Netty学习04--Netty5服务端

àì夳堔傛蜴生んèń 2023-02-17 12:28 9阅读 0赞

目录结构：

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1.ServerHandler

package com.cxb.netty5.server;
    
    import io.netty.channel.ChannelHandlerContext;
    import io.netty.channel.SimpleChannelInboundHandler;
    /**
     * 服务端消息处理
     */
    public class ServerHandler extends SimpleChannelInboundHandler<String> {
    
    	@Override
    	protected void messageReceived(ChannelHandlerContext ctx, String msg) throws Exception {
    
    		System.out.println(msg);
    		
    		ctx.channel().writeAndFlush("hi");
    		ctx.writeAndFlush("hi");
    	}
    
    	/**
    	 * 新客户端接入
    	 */
    	@Override
    	public void channelActive(ChannelHandlerContext ctx) throws Exception {
    		System.out.println("channelActive");
    	}
    
    	/**
    	 * 客户端断开
    	 */
    	@Override
    	public void channelInactive(ChannelHandlerContext ctx) throws Exception {
    		System.out.println("channelInactive");
    	}
    
    	/**
    	 * 异常
    	 */
    	@Override
    	public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
    		cause.printStackTrace();
    	}
    
    
    }

2.Server

package com.cxb.netty5.server;
    
    import io.netty.bootstrap.ServerBootstrap;
    import io.netty.channel.Channel;
    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.nio.NioServerSocketChannel;
    import io.netty.handler.codec.string.StringDecoder;
    import io.netty.handler.codec.string.StringEncoder;
    
    /**
     * netty5服务端
     */
    public class Server {
    
    	public static void main(String[] args) {
    		//服务类
    		ServerBootstrap bootstrap = new ServerBootstrap();
    		
    		//boss和worker
    		EventLoopGroup boss = new NioEventLoopGroup();
    		EventLoopGroup worker = new NioEventLoopGroup();
    		
    		try {
    			//设置线程池
    			bootstrap.group(boss, worker);
    			
    			//设置socket工厂、
    			bootstrap.channel(NioServerSocketChannel.class);
    			
    			//设置管道工厂
    			bootstrap.childHandler(new ChannelInitializer<Channel>() {
    
    				@Override
    				protected void initChannel(Channel ch) throws Exception {
    					ch.pipeline().addLast(new StringDecoder());
    					ch.pipeline().addLast(new StringEncoder());
    					ch.pipeline().addLast(new ServerHandler());
    				}
    			});
    			
    			//netty3中对应设置如下
    			//bootstrap.setOption("backlog", 1024);
    			//bootstrap.setOption("tcpNoDelay", true);
    			//bootstrap.setOption("keepAlive", true);
    			//设置参数，TCP参数
    			bootstrap.option(ChannelOption.SO_BACKLOG, 2048);//serverSocketchannel的设置，链接缓冲池的大小
    			bootstrap.childOption(ChannelOption.SO_KEEPALIVE, true);//socketchannel的设置,维持链接的活跃，清除死链接
    			bootstrap.childOption(ChannelOption.TCP_NODELAY, true);//socketchannel的设置,关闭延迟发送
    			
    			//绑定端口
    			ChannelFuture future = bootstrap.bind(8006);
    			
    			System.out.println("start");
    			
    			//等待服务端关闭
    			future.channel().closeFuture().sync();
    			
    		} catch (Exception e) {
    			e.printStackTrace();
    		} finally{
    			//释放资源
    			boss.shutdownGracefully();
    			worker.shutdownGracefully();
    		}
    	}
    }

一个thread + 队列 == 一个单线程线程池   =====> 线程安全的，任务是线性串行执行的

线程安全，不会产生阻塞效应 ，使用对象组

线程不安全，会产生阻塞效应， 使用对象池

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMzcxNzY2_size_16_color_FFFFFF_t_70 1][]

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[代码下载][Link 1]

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[Link 1]: https://github.com/ChenXbFrank/nettyLearnCode