使用JAVA操作netty框架

之前使用过MINA框架，感觉效率非常好，使用长连接可以支持10万次以上的并发。
今天尝试使用了Netty框架，感觉使用上也非常方便，具体效率问题，在接下来的博客会详细解读：

NioServerSocketChannelFactory创建服务端的ServerSocketChannel，采用多线程执行非阻塞IO，和Mina的设计

模式一样，都采用了Reactor模式。其中bossExecutor、workerExecutor是两个线程池，bossExecutor用来接收客户端连接，workerExecutor用来执行非阻塞的IO操作，主要是read，write。

package netty;

import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.ChannelFactory;
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;

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

/**
 * Created by IntelliJ IDEA.
 * User: flychao88
 * Date: 12-6-6
 * Time: 上午10:14
 * To change this template use File | Settings | File Templates.
 */
public class DiscardServer {
    public static void main(String[] args) throws Exception {
        ChannelFactory factory = new NioServerSocketChannelFactory(
            Executors.newCachedThreadPool(),
            Executors.newCachedThreadPool());
        ServerBootstrap bootstrap = new ServerBootstrap (factory);
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            public ChannelPipeline getPipeline() {
                 ChannelPipeline pipeline = Channels.pipeline();
                pipeline.addLast("encode",new StringEncoder());
                pipeline.addLast("decode",new StringDecoder());
                pipeline.addLast("handler",new DiscardServerHandler());
                return pipeline;
            }
        });
        bootstrap.setOption("child.tcpNoDelay", true);
        bootstrap.setOption("child.keepAlive", true);
        bootstrap.bind(new InetSocketAddress(8080));
    }
}

package netty;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.*;

/**
 * Created by IntelliJ IDEA.
 * User: flychao88
 * Date: 12-6-6
 * Time: 上午10:10
 * To change this template use File | Settings | File Templates.
 */
public class DiscardServerHandler extends SimpleChannelUpstreamHandler  {
    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
       System.out.println("服务器接收1："+e.getMessage());
    }
    
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
        e.getCause().printStackTrace();
        Channel ch = e.getChannel();
        ch.close();
    }
}

package netty;

import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.ChannelFactory;
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;

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

/**
 * Created by IntelliJ IDEA.
 * User: flychao88
 * Date: 12-6-6
 * Time: 上午10:21
 * To change this template use File | Settings | File Templates.
 */
public class TimeClient {
    public static void main(String[] args) throws Exception {
        
        ChannelFactory factory = new NioClientSocketChannelFactory(
            Executors.newCachedThreadPool(),
            Executors.newCachedThreadPool());
        ClientBootstrap bootstrap = new ClientBootstrap(factory);
        bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            public ChannelPipeline getPipeline() {
                ChannelPipeline pipeline = Channels.pipeline();
                pipeline.addLast("encode",new StringEncoder());
                pipeline.addLast("decode",new StringDecoder());
                pipeline.addLast("handler",new TimeClientHandler());
                return pipeline;
            }
        });
        bootstrap.setOption("tcpNoDelay" , true);
        bootstrap.setOption("keepAlive", true);
        bootstrap.connect (new InetSocketAddress("127.0.0.1", 8080));
    }
}

package netty;

/**
 * Created by IntelliJ IDEA.
 * User: flychao88
 * Date: 12-6-6
 * Time: 上午10:22
 * To change this template use File | Settings | File Templates.
 */
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.*;

import java.util.Date;


public class TimeClientHandler extends SimpleChannelUpstreamHandler  {
    @Override
    public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) {
        e.getChannel().write("abcd");
    }

    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
        e.getChannel().close();
    }
    
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
        e.getCause().printStackTrace();
        e.getChannel().close();
    }
}