Netty3- 入门示例

Netty 版本： netty 3.x

1.服务端入门示例 - HelloServer

package xss.netty.netty3;

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

/**
 * netty 3 的入门示例 - 服务端
 */
public class HelloServer {
    public static void main(String[] args) throws  Exception {
        //服务启动类
        ServerBootstrap bootstrap=new ServerBootstrap();
        //两个工作线程池
        Executor bossExecutor = Executors.newCachedThreadPool();//boss 线程池工作组
        Executor workerExecutor=Executors.newCachedThreadPool();//work线程池工作组
        //设置factory
        bootstrap.setFactory(new NioServerSocketChannelFactory(bossExecutor,workerExecutor));
        //设置管道过滤器工厂
        bootstrap.setPipelineFactory(new ChannelPipelineFactory(){
            public ChannelPipeline getPipeline() throws Exception {
                //pipe 类型分为上行与下行
                ChannelPipeline channelPipeline= Channels.pipeline();
                //将输出参数转换为String对象输出到下一个pipe
                channelPipeline.addLast("decorder",new StringDecoder());
                //业务处理的过滤器类
                channelPipeline.addLast("helloHandler",new HelloServerHandler());
                return channelPipeline;
            }
        });
        //绑定端口
        bootstrap.bind(new InetSocketAddress(9999));
        System.out.println("Server started...");
    }
}

对应的请求处理类：HelloServerHandler

package xss.netty.netty3;

import org.jboss.netty.channel.*;

/**
 * 连接
 *  channelOpen->channelConnected
 *                  ->messageReceived
 *        -> channelDisconnected->channelClosed
 */
public class HelloServerHandler extends SimpleChannelHandler {
    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
        System.out.println("messageReceived "+e.getMessage());
        //1.在没有前置自动类型转换的情况下
//        ChannelBuffer channelBuffer=(ChannelBuffer)e.getMessage();
//        System.out.println("message from client="+new String(channelBuffer.array()));

        //2. channelPipeline.addLast("stringDec",new StringDecoder()); 的情况下
        System.out.println("message from client="+(String)e.getMessage());
        super.messageReceived(ctx, e);
    }

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

    @Override
    public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelOpen");
        super.channelOpen(ctx, e);
    }

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

    @Override
    public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelClosed");
        super.channelClosed(ctx, e);
    }

    @Override
    public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelDisconnected");
        super.channelDisconnected(ctx, e);
    }
}

---

2.客户端 - HelloClient

package xss.netty.netty3;

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

/**
 *Netty 3 的客户端示例
 */
public class HelloClient {

    public static void main(String[] args) throws Exception{
        //客户端的服务类
        ClientBootstrap clientBootstrap=new ClientBootstrap();
        java.util.concurrent.Executor bossExecutor=Executors.newCachedThreadPool();
        Executor workerExecutor= Executors.newCachedThreadPool();
        clientBootstrap.setFactory(new NioClientSocketChannelFactory(bossExecutor,workerExecutor));

        //设置pipeline factory
        clientBootstrap.setPipelineFactory(new ChannelPipelineFactory() {
            public ChannelPipeline getPipeline() throws Exception {
                ChannelPipeline channelPipeline=Channels.pipeline();
                channelPipeline.addLast("decoder",new StringDecoder());
                channelPipeline.addLast("encoder",new StringEncoder());
                channelPipeline.addLast("hello",new HelloClientHandler());
                return channelPipeline;
            }
        });
        //连接服务端
        ChannelFuture channelFuture = clientBootstrap.connect(new InetSocketAddress("127.0.0.1", 9999));
        Channel channel = channelFuture.getChannel();
        System.out.println("client connect to server");
        Scanner scanner=new Scanner(System.in);
        while (true){
            System.out.println("input:");
            channel.write(scanner.next());
        }
    }

}

package xss.netty.netty3;

import org.jboss.netty.channel.*;

/**
 * 连接
 *  channelOpen->channelConnected
 *                  ->messageReceived
 *        -> channelDisconnected->channelClosed
 */
public class HelloClientHandler extends SimpleChannelHandler {
    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {
        System.out.println("messageReceived "+e.getMessage());
        //1.在没有前置自动类型转换的情况下
//        ChannelBuffer channelBuffer=(ChannelBuffer)e.getMessage();
//        System.out.println("message from client="+new String(channelBuffer.array()));

        //2. channelPipeline.addLast("stringDec",new StringDecoder()); 的情况下
        System.out.println("message from client="+(String)e.getMessage());
        super.messageReceived(ctx, e);
    }

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

    @Override
    public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelOpen");
        super.channelOpen(ctx, e);
    }

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

    @Override
    public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelClosed");
        super.channelClosed(ctx, e);
    }

    @Override
    public void channelDisconnected(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelDisconnected");
        super.channelDisconnected(ctx, e);
    }
}

3.总结：

业务逻辑根据业务继承：org.jboss.netty.channel.SimpleChannelHandler ,这样就无需太多的关心Socker连接的处理。