Netty学习5-Netty3.X服务端与客户端

2021-08-23 01:04:22

Server1

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;

// netty服务端
public class Server {

	public static void main(String[] args) {
		// 服务类
		ServerBootstrap bootstrap = new ServerBootstrap();
		// boss线程监听端口，worker线程负责数据读写
		ExecutorService boss = Executors.newCachedThreadPool();
		ExecutorService worker = Executors.newCachedThreadPool();
		// 设置niosocket工厂
		bootstrap.setFactory(new NioServerSocketChannelFactory(boss, worker));
		// 设置管道的工厂
		bootstrap.setPipelineFactory(new ChannelPipelineFactory() {
			@Override
			public ChannelPipeline getPipeline() throws Exception {
				ChannelPipeline pipeline = Channels.pipeline();
				pipeline.addLast("helloHandler", new HelloHandler());
				return pipeline;
			}
		});
		bootstrap.bind(new InetSocketAddress(10101));
		System.out.println("server1 start!!!");
	}
}


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;

// 消息接受处理类
public class HelloHandler extends SimpleChannelHandler {

	// 接收消息
	@Override
	public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
			throws Exception {
	
		// 接收消息
		ChannelBuffer messageReceived = (ChannelBuffer) e.getMessage();
		String messageRecStr = new String(messageReceived.array());
		System.out.println(messageRecStr);

		// 回写数据
		if ("hello".equals(messageRecStr)) {
			ChannelBuffer sendBack = ChannelBuffers.copiedBuffer("hi"
					.getBytes());
			ctx.getChannel().write(sendBack);
		} else {
			ChannelBuffer sendBack = ChannelBuffers
					.copiedBuffer("I don't know what you said".getBytes());
			ctx.getChannel().write(sendBack);
		}
		super.messageReceived(ctx, e);
	}

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

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

	// 必须是链接已经建立，关闭通道时才会触发
	@Override
	public void channelDisconnected(ChannelHandlerContext ctx,
			ChannelStateEvent e) throws Exception {
		System.out.println("channelDisconnected");
		super.channelDisconnected(ctx, e);
	}

	// channel关闭的时候触发（见客户端模拟）
	@Override
	public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e)
			throws Exception {
		System.out.println("channelClosed");
		super.channelClosed(ctx, e);
	}
}

Server2

相较示例1中增加了StringEncoder和StringDecoder两个handler对象。

StringDecoder对接受的内容进行解码，继承ChannelUpstreamHandler类。

StringEncoder对发送的内容进行编码，继承ChannelDownstreamHandler类。

请参看本博客《Netty学习6-源码跟踪ChannelPipeline和ChanelHandler工作原理》

http://blog.csdn.net/woshixuye/article/details/53859776

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;


// netty服务端入门
public class Server {

	public static void main(String[] args) {
		// 服务类
		ServerBootstrap bootstrap = new ServerBootstrap();
		// boss线程监听端口，worker线程负责数据读写
		ExecutorService boss = Executors.newCachedThreadPool();
		ExecutorService worker = Executors.newCachedThreadPool();
		// 设置niosocket工厂
		bootstrap.setFactory(new NioServerSocketChannelFactory(boss, worker));
		// 设置管道的工厂
		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("helloHandler", new HelloHandler());
				return pipeline;
			}
		});
		bootstrap.bind(new InetSocketAddress(10101));
		System.out.println("server2 start!!!");
	}
}


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;

// 消息接受处理类
public class HelloHandler extends SimpleChannelHandler {

	// 接收消息
	@Override
	public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
			throws Exception {

		// 接收消息
		String messageReceived = (String) e.getMessage();
		System.out.println(messageReceived);

		// 回写数据
		if ("hello".equals(messageReceived))
			ctx.getChannel().write("hi");
		else
			ctx.getChannel().write("I don't know what you said");
		super.messageReceived(ctx, e);
	}

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

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

	// 必须是链接已经建立，关闭通道时才会触发
	@Override
	public void channelDisconnected(ChannelHandlerContext ctx,
			ChannelStateEvent e) throws Exception {
		System.out.println("channelDisconnected");
		super.channelDisconnected(ctx, e);
	}

	// channel关闭的时候触发（见客户端模拟）
	@Override
	public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e)
			throws Exception {
		System.out.println("channelClosed");
		super.channelClosed(ctx, e);
	}
}

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;

/**
 * netty客户端入门
 */
public class Client {

	@SuppressWarnings("resource")
	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 HiHandler());
				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());
		}
	}

}


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;

/**
 * 消息接受处理类
 */
public class HiHandler extends SimpleChannelHandler {

	// 接收消息
	@Override
	public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)
			throws Exception {
		// 接收消息
		String s = (String) e.getMessage();
		System.out.println(s);
		super.messageReceived(ctx, e);
	}

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

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

	// 必须【连接已经建立】，关闭通道的时候才会触发
	@Override
	public void channelDisconnected(ChannelHandlerContext ctx,
			ChannelStateEvent e) throws Exception {
		System.out.println("channelDisconnected");
		super.channelDisconnected(ctx, e);
	}

	// channel关闭的时候触发（比如服务端没有启动，客户端发起连接的话，就会报这个错）
	@Override
	public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e)
			throws Exception {
		System.out.println("channelClosed");
		super.channelClosed(ctx, e);
	}
}

码农公寓

Server1

Server2

Client

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