netty2---服务端和客户端

package com.client;

import java.net.InetSocketAddress;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
import org.jboss.netty.handler.codec.string.StringDecoder;
import org.jboss.netty.handler.codec.string.StringEncoder;
/**
 * netty客户端入门
 */
public class Client {

    public static void main(String[] args) {
        //服务类
        ClientBootstrap bootstrap = new  ClientBootstrap();
        //2个线程池
        ExecutorService boss = Executors.newCachedThreadPool();
        ExecutorService worker = Executors.newCachedThreadPool();
        //设置niosocket工厂,传入2个线程池，
        bootstrap.setFactory(new NioClientSocketChannelFactory(boss, worker));
        //设置管道工厂
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            //工厂返回ChannelPipeline，是管道，管道里面装的是过滤器，
            @Override
            public ChannelPipeline getPipeline() throws Exception {
                ChannelPipeline pipeline = Channels.pipeline();
                //传的是字节流，不是字符
                pipeline.addLast("decoder", new StringDecoder());
                pipeline.addLast("encoder", new StringEncoder());
                pipeline.addLast("hiHandler", new ClientHandler());
                return pipeline;
            }
        });
        
        //连接服务端
        ChannelFuture connect = bootstrap.connect(new InetSocketAddress("127.0.0.1", 10101));
        Channel channel = connect.getChannel();
        System.out.println("client start");
        Scanner scanner = new Scanner(System.in);
        while(true){
            System.out.println("请输入");
            channel.write(scanner.next());
        }
    }
}

package com.client;

import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
/**
 * 消息接受处理类
 */
public class ClientHandler extends SimpleChannelHandler {

    /**
     * 接收消息
     */
    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
        String s = (String) e.getMessage();
        System.out.println(s);
        super.messageReceived(ctx, e);
    }

    /**
     * 捕获异常
     */
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
        System.out.println("exceptionCaught");
        super.exceptionCaught(ctx, e);
    }

    /**
     * 新连接
     */
    @Override
    public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelConnected");
        super.channelConnected(ctx, e);
    }

    /**
     * 必须是链接已经建立，关闭通道的时候才会触发。服务端关闭了也调用。
     */
    @Override
    public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelDisconnected");
        super.channelDisconnected(ctx, e);
    }

    /**
     * channel关闭的时候触发，服务端关闭了也调用。
     */
    @Override
    public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelClosed");
        super.channelClosed(ctx, e);
    }
}

package com.server;

import java.net.InetSocketAddress;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
import org.jboss.netty.handler.codec.string.StringDecoder;
import org.jboss.netty.handler.codec.string.StringEncoder;
/**
 * netty服务端入门
 */

/* netty版本大致版本分为  netty3.x  和  netty4.x、netty5.x

netty可以运用的领域：
1分布式进程通信
hadoop、dubbo、akka等具有分布式功能的框架，只要是java的，底层RPC通信都是基于netty实现的，这些框架使用的版本通常都还在用netty3.x

2、游戏服务器开发
页游手游都是java,服务器是netty或者mina，最新的游戏服务器有部分公司可能已经开始采用netty4.x 或 netty5.x
*/

public class Server {
    public static void main(String[] args) {
        //服务类
        ServerBootstrap bootstrap = new ServerBootstrap();
        //boss线程监听端口，worker线程负责数据读写
        ExecutorService boss = Executors.newCachedThreadPool();
        ExecutorService worker = Executors.newCachedThreadPool();
        //设置niosocket工厂，boss和worker线程都会分配一个selector,boss的selector负责监听端口，worker的selector负责读写任务。
        bootstrap.setFactory(new NioServerSocketChannelFactory(boss, worker));
        //设置管道的工厂
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            //管道里面装的是过滤器，
            @Override
            public ChannelPipeline getPipeline() throws Exception {
                ChannelPipeline pipeline = Channels.pipeline();
                //传的不是字符，是字节流。
                //StringEncoder/StringDecoder就不用在接收消息的地方把ChannelBuffer转成string了。
                pipeline.addLast("decoder", new StringDecoder());//StringDecoder是上行的管道。
                pipeline.addLast("encoder", new StringEncoder());//StringEncoder是下行的管道。
                pipeline.addLast("helloHandler", new ServerHandler());//ServerHandler是上行和下行管道。
                return pipeline;
            }
        });
        bootstrap.bind(new InetSocketAddress(10101));//接收消息在HelloHandler
        System.out.println("start!!!");
    }
}

package com.server;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
/**
 * 消息接受处理类
 */
public class ServerHandler extends SimpleChannelHandler {

    /**
     * 接收消息
     */
    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
        String s = (String) e.getMessage();
        /*ChannelBuffer message = (ChannelBuffer)e.getMessage();
        String s = new String(message.array());*/
        System.out.println(s);
        //回写数据
        ctx.getChannel().write("hi");
        super.messageReceived(ctx, e);
    }

    /**
     * 捕获异常
     */
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
        System.out.println("exceptionCaught");
        super.exceptionCaught(ctx, e);
    }

    /**
     * 新连接，通常用来检测IP是否是黑名单
     */
    @Override
    public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelConnected");
        super.channelConnected(ctx, e);
    }

    /**
     * 必须是链接已经建立成功，关闭通道的时候才会触发，先触发channelDisconnected在触发channelClosed。
     * 
     * 可以再用户断线的时候清楚用户的缓存数据等
     */
    @Override
    public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelDisconnected");
        super.channelDisconnected(ctx, e);
    }

    /**
     * 就算没有建立成功，channel关闭的时候触发
     * 
     * 可以再用户断线的时候清楚用户的缓存数据等
     */
    @Override
    public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelClosed");
        super.channelClosed(ctx, e);
    }
}