Java NIO框架Netty1简单发送接受

港控/mmm° 2022-01-13 16:59 189阅读 0赞

先来个例子：再慢慢开源，走流程了！！！

1，Server端：

package com.netty1;
    
    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;    
    import org.jboss.netty.handler.codec.string.StringDecoder;    
    import org.jboss.netty.handler.codec.string.StringEncoder;    
        
    import java.net.InetSocketAddress;    
    import java.util.concurrent.Executors;    
         
    public class Server {    
        public static void main(String[] args) throws Exception {    
            ChannelFactory factory = new NioServerSocketChannelFactory(    
                Executors.newCachedThreadPool(),    
                Executors.newCachedThreadPool());    
            ServerBootstrap bootstrap = new ServerBootstrap (factory);    
            bootstrap.setPipelineFactory(new ChannelPipelineFactory() {    
                public ChannelPipeline getPipeline() {    
                     ChannelPipeline p = Channels.pipeline();    
                    p.addLast("encode",new StringEncoder());    
                    p.addLast("decode",new StringDecoder());    
                    p.addLast("handler",new ServerHandler());    
                    return p;    
                }    
            });    
            bootstrap.setOption("child.tcpNoDelay", true);    
            bootstrap.setOption("child.keepAlive", true); 
            //--服务端监听端口号; 
            bootstrap.bind(new InetSocketAddress(14000));  
        }    
    }

2.ServerHandler

package com.netty1;
    
    import org.jboss.netty.channel.*;    
          
    public class ServerHandler extends SimpleChannelUpstreamHandler  {    
        @Override    
        public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) { 
        	//接受消息处理
           System.out.println("服务器接受到1："+e.getMessage());    
        }    
         
       @Override    
        public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) {    
    	   e.getChannel().write("Reply----");    
        }  
        @Override   
        public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {   
        e.getCause().printStackTrace();   
        Channel ch = e.getChannel();   
        ch.close();   
        }   
    }

3,Client端

package com.netty1;
    
    import org.jboss.netty.bootstrap.ClientBootstrap;    
    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.NioClientSocketChannelFactory;    
    import org.jboss.netty.handler.codec.string.StringDecoder;    
    import org.jboss.netty.handler.codec.string.StringEncoder;    
        
    import java.net.InetSocketAddress;    
    import java.util.concurrent.Executors;    
         
    public class Client {    
        public static void main(String[] args) throws Exception {    
                
            ChannelFactory factory = new NioClientSocketChannelFactory(    
                Executors.newCachedThreadPool(),    
                Executors.newCachedThreadPool());    
            ClientBootstrap bootstrap = new ClientBootstrap(factory);    
            bootstrap.setPipelineFactory(new ChannelPipelineFactory() {    
                public ChannelPipeline getPipeline() {    
                    ChannelPipeline p = Channels.pipeline();    
                    p.addLast("encode",new StringEncoder());    
                    p.addLast("decode",new StringDecoder());    
                    p.addLast("handler",new ClientHandler());    
                    return p;    
                }    
            });    
            bootstrap.setOption("tcpNoDelay" , true);    
            bootstrap.setOption("keepAlive", true);    
            bootstrap.connect (new InetSocketAddress("127.0.0.1", 14000));    
        }    
    }

4,ClientHandler

package com.netty1;
    
    import org.jboss.netty.channel.*;    
        
        
    public class ClientHandler extends SimpleChannelUpstreamHandler  {    
    	@Override    
        public void channelConnected(ChannelHandlerContext ctx, ChannelStateEvent e) {    
    		e.getChannel().write("request");    
        }    
        
        @Override    
        public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {    
            System.out.println("服务器回复:" + e.getMessage());  
            e.getChannel().close();    
        }    
            
        @Override    
        public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {    
            e.getCause().printStackTrace();    
            e.getChannel().close();    
        }    
    }

简单的客户端，服务端代码算是搞定了，运行！！！

贴个流程：

![SouthEast][]

后面就是事件了：

![SouthEast 1][]

**实际Client的调用时这样的：这个时候才到自己的ClientHandler**

![SouthEast 2][]

**write:NioWorker.write()**

![SouthEast 3][]

[SouthEast]: /images/20220113/3977307395ac4e5b9f773e28a7246128.png
[SouthEast 1]: /images/20220113/8e8fc8e5355f4c84afa9d62450af28b2.png
[SouthEast 2]: /images/20220113/dfa1f708822e4dbcabe9dbaaf59adb3e.png
[SouthEast 3]: /images/20220113/6e042ca7f8e7492ea645506f3345c5fe.png