java netty简单使用

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。 

使用到的jar 

 <dependency>
            <groupId>org.jboss.netty</groupId>
            <artifactId>netty</artifactId>
            <version>3.2.9.Final</version>
        </dependency>
  </dependencies>

import java.net.InetSocketAddress;import java.util.concurrent.Executors;import org.jboss.netty.bootstrap.ServerBootstrap;import org.jboss.netty.channel.ChannelHandlerContext;import org.jboss.netty.channel.ChannelPipeline;import org.jboss.netty.channel.ChannelPipelineFactory;import org.jboss.netty.channel.ChannelStateEvent;import org.jboss.netty.channel.Channels;import org.jboss.netty.channel.ExceptionEvent;import org.jboss.netty.channel.MessageEvent;import org.jboss.netty.channel.SimpleChannelHandler;import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;import org.jboss.netty.handler.codec.string.StringDecoder;import org.jboss.netty.handler.codec.string.StringEncoder;public class DiscardServer {public static void main(String[] args) {// Server服务启动器ServerBootstrap bootstrap = new ServerBootstrap(new NioServerSocketChannelFactory(Executors.newCachedThreadPool(),Executors.newCachedThreadPool()));// 设置一个处理客户端消息和各种消息事件的类(Handler)bootstrap.setPipelineFactory(new ChannelPipelineFactory() {@Overridepublic ChannelPipeline getPipeline() throws Exception {ChannelPipeline pipeline = Channels.pipeline();  pipeline.addLast("encode",new StringEncoder());                  pipeline.addLast("decode",new StringDecoder());                pipeline.addLast("handler",new HelloServerHandler());  return pipeline;}});// 开放8000端口供客户端访问。bootstrap.bind(new InetSocketAddress(8000));}private static class HelloServerHandler extends SimpleChannelHandler {/** * 当有客户端绑定到服务端的时候触发，打印"Hello world, I'm server." *  * @alia OneCoder * @author lihzh */@Overridepublic void channelConnected(ChannelHandlerContext ctx,ChannelStateEvent e) {System.out.println("Hello world, I'm server.");}@Overridepublic void messageReceived(ChannelHandlerContext ctx, MessageEvent e)throws Exception {String message = (String) e.getMessage();System.out.println(message);e.getChannel().close();}@Overridepublic void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)throws Exception {System.out.println("服务端异常"+e.getCause());e.getChannel().close();}}}

public class HelloClient { // Client服务启动器      private static ClientBootstrap bootstrap = new ClientBootstrap(              new NioClientSocketChannelFactory(                      Executors.newCachedThreadPool(),                      Executors.newCachedThreadPool()));    public static int i=0;public static void main(String args[]) throws InterruptedException {  while(true) {        // 设置一个处理服务端消息和各种消息事件的类(Handler)  bootstrap.setPipelineFactory(new ChannelPipelineFactory() {              @Override              public ChannelPipeline getPipeline() throws Exception {             ChannelPipeline pipeline = Channels.pipeline();              pipeline.addLast("encode",new StringEncoder());                   pipeline.addLast("decode",new StringDecoder());                   pipeline.addLast("handler",new HelloClientHandler());                  return pipeline;              }          });          // 连接到本地的8000端口的服务端          bootstrap.connect(new InetSocketAddress(                  "127.0.0.1", 8000));        System.out.println("计数:"+(i++));}    }        private static class HelloClientHandler extends SimpleChannelHandler {              @Overridepublic void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)throws Exception {        System.out.println("客服端---"+e.getCause());}/**          * 当绑定到服务端的时候触发，打印"Hello world, I'm client."          *           * @alia OneCoder          * @author lihzh          */          @Override          public void channelConnected(ChannelHandlerContext ctx,                  ChannelStateEvent e) {              e.getChannel().write("xxxxxxxxxxxxx");        }@Overridepublic void messageReceived(ChannelHandlerContext ctx, MessageEvent e)throws Exception { e.getChannel().close();}    }  }