Netty

高性能的网络应用程序框架（对底层进行封装）

Java NIO框架

典型的C/S架构

 

Netty比Mina更容易学习，优先使用netty

 

server:

 

package me.hello.netty;

import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.*;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;
import org.jboss.netty.handler.codec.string.StringDecoder;
import org.jboss.netty.handler.codec.string.StringEncoder;

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

/**
 * God Bless You!
 * Author: Fangniude
 * Date: 2013-07-15
 */
public class NettyServer {
    public static void main(String[] args) {
        ServerBootstrap bootstrap = new ServerBootstrap(new NioServerSocketChannelFactory(Executors.newCachedThreadPool(), Executors.newCachedThreadPool()));

        // Set up the default event pipeline.
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            @Override
            public ChannelPipeline getPipeline() throws Exception {
                return Channels.pipeline(new StringDecoder(), new StringEncoder(), new ServerHandler());
            }
        });

        // Bind and start to accept incoming connections.
        Channel bind = bootstrap.bind(new InetSocketAddress(8000));
        System.out.println("Server已经启动，监听端口: " + bind.getLocalAddress() + "， 等待客户端注册。。。");
    }

    private static class ServerHandler extends SimpleChannelHandler {
        @Override
        public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
            if (e.getMessage() instanceof String) {
                String message = (String) e.getMessage();
                System.out.println("Client发来:" + message);

                e.getChannel().write("Server已收到刚发送的:" + message);

                System.out.println("\n等待客户端输入。。。");
            }

            super.messageReceived(ctx, e);
        }

        @Override
        public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) throws Exception {
            super.exceptionCaught(ctx, e);
        }

        @Override
        public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
            System.out.println("有一个客户端注册上来了。。。");
            System.out.println("Client:" + e.getChannel().getRemoteAddress());
            System.out.println("Server:" + e.getChannel().getLocalAddress());
            System.out.println("\n等待客户端输入。。。");
            super.channelConnected(ctx, e);
        }
    }
}

　　

 

client:

package me.hello.netty;

import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.*;
import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
import org.jboss.netty.handler.codec.string.StringDecoder;
import org.jboss.netty.handler.codec.string.StringEncoder;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.InetSocketAddress;
import java.util.concurrent.Executors;

/**
 * God Bless You!
 * Author: Fangniude
 * Date: 2013-07-15
 */
public class NettyClient {

    public static void main(String[] args) {
        // Configure the client.
        ClientBootstrap bootstrap = new ClientBootstrap(new NioClientSocketChannelFactory(Executors.newCachedThreadPool(), Executors.newCachedThreadPool()));

        // Set up the default event pipeline.
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            @Override
            public ChannelPipeline getPipeline() throws Exception {
                return Channels.pipeline(new StringDecoder(), new StringEncoder(), new ClientHandler());
            }
        });

        // Start the connection attempt.
        ChannelFuture future = bootstrap.connect(new InetSocketAddress("localhost", 8000));

        // Wait until the connection is closed or the connection attempt fails.
        future.getChannel().getCloseFuture().awaitUninterruptibly();

        // Shut down thread pools to exit.
        bootstrap.releaseExternalResources();
    }

    private static class ClientHandler extends SimpleChannelHandler {
        private BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));

        @Override
        public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
            if (e.getMessage() instanceof String) {
                String message = (String) e.getMessage();
                System.out.println(message);

                e.getChannel().write(sin.readLine());

                System.out.println("\n等待客户端输入。。。");
            }

            super.messageReceived(ctx, e);
        }

        @Override
        public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
            System.out.println("已经与Server建立连接。。。。");
            System.out.println("\n请输入要发送的信息：");
            super.channelConnected(ctx, e);

            e.getChannel().write(sin.readLine());
        }
    }
}

　　

Netty那点事（一）概述

http://my.oschina.net/flashsword/blog/162936

Netty、Mina、xSocket、Grizzly比较