netty echo 例子-优快云博客

本文介绍了一个基于 Netty 的简单 ECHO 服务器实现，包括服务器启动过程、消息接收处理及异常捕获等核心代码。该服务器监听8080端口，并实现了消息回显功能。

// ECHO 协议，服务器实现

package com.bigdata.jboss.basic;

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

public class EchoServerHandler extends SimpleChannelHandler{

	@Override
	public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
			throws Exception {
		Channel channel = e.getChannel();
		channel.write(e.getMessage());
	}

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

}

package com.tcloud.bigdata.jboss.basic;

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

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;

public class EchoServer {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		ChannelFactory factory = new NioServerSocketChannelFactory(Executors.newCachedThreadPool(),Executors.newCachedThreadPool());
		ServerBootstrap bootstrap = new ServerBootstrap(factory);
		bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
			
			public ChannelPipeline getPipeline() throws Exception {
				return Channels.pipeline(new EchoServerHandler());
			}
		});
		bootstrap.setOption("child.tcpNoDelay", true);
		bootstrap.setOption("child.keepAlive",true);
		bootstrap.bind(new InetSocketAddress(8080));
		System.out.println("Echo server started");
	}

}

//ECHO 服务器运行代码

package com.bigdata.jboss.basic;

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

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;

public class EchoServer {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		ChannelFactory factory = new NioServerSocketChannelFactory(Executors.newCachedThreadPool(),Executors.newCachedThreadPool());
		ServerBootstrap bootstrap = new ServerBootstrap(factory);
		bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
			
			public ChannelPipeline getPipeline() throws Exception {
				return Channels.pipeline(new EchoServerHandler());
			}
		});
		bootstrap.setOption("child.tcpNoDelay", true);
		bootstrap.setOption("child.keepAlive",true);
		bootstrap.bind(new InetSocketAddress(8080));
		System.out.println("Echo server started");
	}

}

具体解释参考写道

http://marsorp.iteye.com/blog/1555001