1. 我們在使用netty的是有都會存在將channelBuffer的資料處理成相應的String或者自定義資料。而這裡主要是介紹管道里面存在的上行和下行的資料處理方式

2. 通過一張圖片來看一下具體管道中的實現過程

• server

package com.server;

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

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 org.jboss.netty.handler.codec.string.StringEncoder;

public class Server {

	public static void main(String[] args) {
		//服務類
		ServerBootstrap bootstrap = new ServerBootstrap();

		//boss執行緒監聽埠，worker執行緒負責資料讀寫
		ExecutorService boss = Executors.newCachedThreadPool();
		ExecutorService worker = Executors.newCachedThreadPool();

		//設定niosocket工廠
		bootstrap.setFactory(new NioServerSocketChannelFactory(boss, worker));

		//設定管道的工廠
		bootstrap.setPipelineFactory(new ChannelPipelineFactory() {

			@Override
			public ChannelPipeline getPipeline() throws Exception {

				ChannelPipeline pipeline = Channels.pipeline();
				pipeline.addLast("handler1", new MyHandler1());
				pipeline.addLast("handler2", new MyHandler2());
				return pipeline;
			}
		});

		bootstrap.bind(new InetSocketAddress(10101));

		System.out.println("start!!!");
	}

}

• client

package com.server;

import java.net.Socket;

public class Client {

	public static void main(String[] args) throws Exception {

		Socket socket = new Socket("127.0.0.1", 10101);

		socket.getOutputStream().write("hello".getBytes());

		socket.close();
	}

}

• MyHandler1

package com.server;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
import org.jboss.netty.channel.UpstreamMessageEvent;

public class MyHandler1 extends SimpleChannelHandler {

	@Override
	public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {

		ChannelBuffer buffer = (ChannelBuffer)e.getMessage();

		byte[] array = buffer.array();
		String message = new String(array);
		System.out.println("handler1:" + message);

		//傳遞
		ctx.sendUpstream(new UpstreamMessageEvent(ctx.getChannel(), "abc", e.getRemoteAddress()));
		ctx.sendUpstream(new UpstreamMessageEvent(ctx.getChannel(), "efg", e.getRemoteAddress()));
	}
}

• MyHandler2

package com.server;

import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;

public class MyHandler2 extends SimpleChannelHandler {

	@Override
	public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {

		String message = (String)e.getMessage();

		System.out.println("handler2:" + message);
	}
}