Netty学习03--Netty3客户端

小灰灰 2023-02-17 11:04 23阅读 0赞

Netty的客户端和服务端的内容差不多，直接上代码了0.0

![20200614093606580.png][]

1.HiHander

package com.cxb.client;
    
    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 {
    
    		
    		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);
    	}
    
    	/**
    	 * 必须是链接已经建立，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
    	 */
    	@Override
    	public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
    		System.out.println("channelClosed");
    		super.channelClosed(ctx, e);
    	}
    }

2.Client

package com.cxb.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 {
    
    	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", 8003));
    		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());
    		}
    	}
    
    }

3.测试，先启动服务端，上篇博文的代码，在启动客户端

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMzcxNzY2_size_16_color_FFFFFF_t_70][]

当客户端输入消息之后，服务端会返回hi字符串！

[代码下载][Link 1]

[20200614093606580.png]: https://img-blog.csdnimg.cn/20200614093606580.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMzcxNzY2_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20200613134310591.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzMzMzcxNzY2,size_16,color_FFFFFF,t_70
[Link 1]: https://github.com/ChenXbFrank/nettyLearnCode