基于Netty的客户端小Demo

客户端代码与服务器几乎一致

channelHandler类代码如下

package com.jliangmu.client;

import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.ExceptionEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;

public class Clienthandler extends SimpleChannelHandler{
//关闭连接时调用
	public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e)
			throws Exception {
		System.out.println("channelClosed");
		super.channelClosed(ctx, e);
	}
//成功连接时调用
	public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e)
			throws Exception {
		System.out.println("channelConnected");
		super.channelConnected(ctx, e);
	}
//断开连接时调用
	public void channelDisconnected(ChannelHandlerContext ctx,
			ChannelStateEvent e) throws Exception {
		System.out.println("channelDisconnected");
		super.channelDisconnected(ctx, e);
	}
/*在ServerHandler运行时发生异常调用*/
	public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)
			throws Exception {
		System.out.println("exceptionCaught");
		super.exceptionCaught(ctx, e);
	}
//传递信息时调用
	public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
			throws Exception {
		String s = (String) e.getMessage();
		System.out.println(s);
		super.messageReceived(ctx, e);
	}
}
           

传递信息接收到消息时，直接打印到控制台上，不回写给服务端，否则会造成相互回写的死循环

Client类代码如下

package com.jliangmu.client;

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

import org.jboss.netty.bootstrap.ClientBootstrap;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
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.NioClientSocketChannelFactory;
import org.jboss.netty.handler.codec.string.StringDecoder;
import org.jboss.netty.handler.codec.string.StringEncoder;

import com.jliangmu.client.Clienthandler;;

/**
 * @author Administrator
 *
 */
public class Client {

	public static void main(String[] args) {
		
		//服务类
		ClientBootstrap bootstrap = new  ClientBootstrap();
		
		//线程池
		ExecutorService boss = Executors.newCachedThreadPool();
		ExecutorService worker = Executors.newCachedThreadPool();
		
		//socket工厂
		bootstrap.setFactory(new NioClientSocketChannelFactory(boss, worker));
		
		//管道工厂
		bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
			
			@Override
			public ChannelPipeline getPipeline() throws Exception {
				ChannelPipeline pipeline = Channels.pipeline();
				pipeline.addLast("decoder", new StringDecoder());
				pipeline.addLast("encoder", new StringEncoder());
				pipeline.addLast("hiHandler", new Clienthandler());
				return pipeline;
			}
		});
		
		//连接服务端
		ChannelFuture connect = bootstrap.connect(new InetSocketAddress("127.0.0.1", 10101));
		Channel channel = connect.getChannel();
		
		System.out.println("client start");
		
		Scanner scanner = new Scanner(System.in);
		while(true){
			System.out.println("请输入");
			channel.write(scanner.next());
		}
	}

}
           

与服务端代码的区别就是需要连接服务端，以及主动向服务端发送数据，这里用一个死循环实现