Netty入门（四）——服务端与客户端案例netty5.x

上一篇已用3.X版实现，这篇已5.X方式实现：实现方式有些稍微变化

客户端案例：

ClientHandler.java

package com.client;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
/**
 * 客户端消息处理
 *
 */
public class ClientHandler extends SimpleChannelInboundHandler<String> {

	@Override
	protected void messageReceived(ChannelHandlerContext ctx, String msg) throws Exception {
		System.out.println("客户端收到消息:"+msg);
	}

}

Client.class

package com.client;

import java.io.BufferedReader;
import java.io.InputStreamReader;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

/**
 * netty5的客户端
 *
 */
public class Client {

	public static void main(String[] args) {
		//服务类
		Bootstrap bootstrap = new Bootstrap();
		
		//worker
		EventLoopGroup worker = new NioEventLoopGroup();
		
		try {
			//设置线程池
			bootstrap.group(worker);
			
			//设置socket工厂、
			bootstrap.channel(NioSocketChannel.class);
			
			//设置管道
			bootstrap.handler(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 ClientHandler());
				}
			});
			
			ChannelFuture connect = bootstrap.connect("127.0.0.1", 10101);
			
			BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
			while(true){
				System.out.println("请输入：");
				String msg = bufferedReader.readLine();
				connect.channel().writeAndFlush(msg);
			}
			
		} catch (Exception e) {
			 e.printStackTrace();
		} finally{
			worker.shutdownGracefully();
		}
	}
}

服务器端案例：

ServerHandler.java

package com.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();
	}
	
	
}

Server.class

package com.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(10101);
			
			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();
		}
	}
}

后续继续完善与优化