Netty learning 05 - cliente Netty5

Estructura de directorios:

1.Cliente

package com.cxb.netty5.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", 8006);

            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();
        }
    }
}

2.ClientHandler

package com.cxb.netty5.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);
	}

}

3.Cliente múltiple

package com.cxb.netty5.client;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

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;

/**
 * 多连接客户端
 */
public class MultClient {

    /**
     * 服务类
     */
    private Bootstrap bootstrap = new Bootstrap();

    /**
     * 会话
     */
    private List<Channel> channels = new ArrayList<>();

    /**
     * 引用计数
     */
    private final AtomicInteger index = new AtomicInteger();

    /**
     * 初始化
     *
     * @param count
     */
    public void init(int count) {

        //worker
        EventLoopGroup worker = new NioEventLoopGroup();

        //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());
            }
        });

        for (int i = 1; i <= count; i++) {
            ChannelFuture future = bootstrap.connect("192.168.3.112", 8006);
            channels.add(future.channel());
        }
    }

    /**
     * 获取会话
     *
     * @return
     */
    public Channel nextChannel() {
        return getFirstActiveChannel(0);
    }


    private Channel getFirstActiveChannel(int count) {
        Channel channel = channels.get(Math.abs(index.getAndIncrement() % channels.size()));
        if (!channel.isActive()) {
            //重连
            reconnect(channel);
            if (count >= channels.size()) {
                throw new RuntimeException("no can use channel");
            }
            return getFirstActiveChannel(count + 1);
        }
        return channel;
    }

    /**
     * 重连
     *
     * @param channel
     */
    private void reconnect(Channel channel) {
        synchronized (channel) {
            if (channels.indexOf(channel) == -1) {
                return;
            }

            Channel newChannel = bootstrap.connect("192.168.3.112", 8006).channel();
            channels.set(channels.indexOf(channel), newChannel);
        }
    }

}

4.Iniciar

package com.cxb.netty5.client;

import java.io.BufferedReader;
import java.io.InputStreamReader;
/**
 * 启动类
 */
public class Start {

	public static void main(String[] args) {

		MultClient client = new MultClient();
		client.init(5);
		
		BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
		while(true){
			try {
				System.out.println("请输入:");
				String msg = bufferedReader.readLine();
				client.nextChannel().writeAndFlush(msg);
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

}

Pruebe, inicie el servidor y el cliente.

El cliente ingresa cualquier carácter y el servidor devuelve hola al cliente después de recibir el mensaje.

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