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() {
@Override
public 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 {
/**

4000
* 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
*/
@Override
public void channelConnected(ChannelHandlerContext ctx,
ChannelStateEvent e) {
System.out.println("Hello world, I'm server.");
}

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

@Override
public 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() {@Overridepublic 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*/@Overridepublic void channelConnected(ChannelHandlerContext ctx,ChannelStateEvent e) {e.getChannel().write("xxxxxxxxxxxxx");}@Overridepublic void messageReceived(ChannelHandlerContext ctx, MessageEvent e)throws Exception {e.getChannel().close();}}}