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netty 3.9.2 UDP协议服务器和客户端DEMO

说明:基于netty 3.9.2的udp协议实现的(如果你使用的版本是4.X或5.X,请参考其他方法);程序的逻辑结构是,客户端发送给服务端一串数据,服务器端返回给客户端“A”。在进行游戏开发时需要对udp的丢包进行处理,可以利用服务器端的返回值进行相关处理,以确定是否重发,这方面具体没有实现。

文章结构:

一、服务器端

1、UDPServer

2、UdpChannelPipelineFactory

3、UDPServerHandler

二、客户端

1、UDPClient

2、UDPClientChannelPipelineFactory

3、UDPClientHandler

三、ScanGetPort获取一个可用的端口号

一、服务器端

1、UDPServer

初始化一个ConnectionlessBootstrap,setPipelineFactory,绑定一个端口号。ScanGetPort是一个工具类就是,获取一个可用的端口号,源代码在最后面贴出。

package com.ls.udp.server;import java.net.InetSocketAddress;import java.util.concurrent.Executors;import org.jboss.netty.bootstrap.ConnectionlessBootstrap;import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory;import com.andy.server.util.ScanGetPort;public class UDPServer {        public final int PORT;    public UDPServer(int port){        PORT=port;    }    private ConnectionlessBootstrap  bootstrap;    void start(){        //init the bootstrap        bootstrap=new ConnectionlessBootstrap(new NioDatagramChannelFactory(Executors.newCachedThreadPool()));        bootstrap.setPipelineFactory(new UdpChannelPipelineFactory());        bootstrap.bind(new InetSocketAddress(PORT));        System.out.println("server start at:"+":"+PORT);    }        public static void main(String[] args) {        /*         * 获取一个可用的端口号         */        int port= new ScanGetPort().getPot(8080);        new UDPServer(port).start();    }    }

2、UdpChannelPipelineFactory

注册一个handler

package com.ls.udp.server;import org.jboss.netty.channel.ChannelPipeline;import org.jboss.netty.channel.ChannelPipelineFactory;import org.jboss.netty.channel.Channels;public class UdpChannelPipelineFactory implements ChannelPipelineFactory{        /**     * set the channel pipeline     *      */    @Override    public ChannelPipeline getPipeline() throws Exception {        ChannelPipeline pipeline = Channels.pipeline();        pipeline.addLast("handler", new UDPServerHandler());        return pipeline;    }}

3、UDPServerHandler

handler类

package com.ls.udp.server;import org.jboss.netty.buffer.ChannelBuffer;import org.jboss.netty.buffer.DynamicChannelBuffer;import org.jboss.netty.channel.ChannelHandlerContext;import org.jboss.netty.channel.ExceptionEvent;import org.jboss.netty.channel.MessageEvent;import org.jboss.netty.channel.SimpleChannelUpstreamHandler;public class UDPServerHandler extends SimpleChannelUpstreamHandler{    /**     *  对于ChannelHandler,     *  是UDP与TCP区别的核心所在。     *  大家都知道UDP是无连接的,     *  也就是说你通过 MessageEvent 参数对象的 getChannel() 方法获取当前会话连接,     *  但是其 isConnected() 永远都返回 false。     *  UDP 开发中在消息获取事件回调方法中,     *  获取了当前会话连接 channel 对象后可直接通过 channel 的 write 方法发送数据给对端 channel.write(message, remoteAddress),     *  第一个参数仍然是要发送的消息对象,      *  第二个参数则是要发送的对端 SocketAddress 地址对象。     *  这里最需要注意的一点是SocketAddress,在TCP通信中我们可以通过channel.getRemoteAddress()获得,     *  但在UDP通信中,我们必须从MessageEvent中通过调用getRemoteAddress()方法获得对端的SocketAddress 地址。      */    @Override    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)            throws Exception {                ChannelBuffer buffer = (ChannelBuffer)e.getMessage();        byte[] recByte=buffer.copy().toByteBuffer().array();                String msg=new String(recByte);        System.out.println("from client:"+msg);                ChannelBuffer responseBuffer= new DynamicChannelBuffer(1);                responseBuffer.writeBytes("A".getBytes());                //write to the client        e.getChannel().write(responseBuffer, e.getRemoteAddress());                        super.messageReceived(ctx, e);    }    @Override    public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)            throws Exception {        super.exceptionCaught(ctx, e);    }}

二、客户端

(基本结构和服务器端很像,不再赘述)

1、UDPClient

package com.ls.udp.client;import java.net.InetSocketAddress;import java.util.Scanner;import org.jboss.netty.bootstrap.ConnectionlessBootstrap;import org.jboss.netty.buffer.ChannelBuffer;import org.jboss.netty.buffer.DynamicChannelBuffer;import org.jboss.netty.channel.Channel;import org.jboss.netty.channel.socket.nio.NioDatagramChannelFactory;public class UDPClient {    private ConnectionlessBootstrap  bootstrap;    private Channel channel;    public void start(){        //init the bootstrap        bootstrap=new ConnectionlessBootstrap(new NioDatagramChannelFactory());        bootstrap.setPipelineFactory(new UDPClientChannelPipelineFactory());        bootstrap.setOption("localAddress", new InetSocketAddress(10001));        channel=bootstrap.bind();    }        public void writebytes(byte[] bt,InetSocketAddress isa){        if(bootstrap==null){            this.start();        }        ChannelBuffer responseBuffer= new DynamicChannelBuffer(12);                responseBuffer.writeBytes(bt);        channel.write(responseBuffer, isa);    }            public static void main(String[] args) {                        UDPClient uClient=new UDPClient();                        Scanner scanner=new Scanner(System.in);        String lienString=scanner.nextLine();        while(!lienString.equals("bye")){                        uClient.writebytes(lienString.getBytes(), new InetSocketAddress("192.168.1.107",8080));            lienString=scanner.nextLine();        }    }        }

 

 

 

2、UDPClientChannelPipelineFactory

 

package com.ls.udp.client;import org.jboss.netty.channel.ChannelPipeline;import org.jboss.netty.channel.ChannelPipelineFactory;import org.jboss.netty.channel.Channels;public class UDPClientChannelPipelineFactory implements ChannelPipelineFactory{        /**     * set the channel pipeline     *      */    @Override    public ChannelPipeline getPipeline() throws Exception {        ChannelPipeline pipeline = Channels.pipeline();        pipeline.addLast("handler", new UDPClientHandler());        return pipeline;    }}

 

 

3、UDPClientHandler

 

package com.ls.udp.client;import org.jboss.netty.buffer.ChannelBuffer;import org.jboss.netty.channel.ChannelHandlerContext;import org.jboss.netty.channel.ExceptionEvent;import org.jboss.netty.channel.MessageEvent;import org.jboss.netty.channel.SimpleChannelUpstreamHandler;public class UDPClientHandler extends SimpleChannelUpstreamHandler{    @Override    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e)            throws Exception {                        ChannelBuffer buffer = (ChannelBuffer)e.getMessage();        byte[] recByte=buffer.copy().toByteBuffer().array();                String msg=new String(recByte);        System.out.println("from server:"+msg);                        super.messageReceived(ctx, e);    }    @Override    public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e)            throws Exception {        super.exceptionCaught(ctx, e);    }    }

三、ScanGetPort获取一个可用的端口号

package com.andy.server.util;import java.io.IOException;import java.net.ServerSocket;/** * get the port * @author red * */public class ScanGetPort {    public synchronized  int  getPot(int first){        for(int i=first;i<65535;++i){            ServerSocket ss=null;            try {                 ss= new ServerSocket(i);            } catch (IOException e) {                //e.printStackTrace();            }finally{                if(ss!=null){                    if(ss.isBound()){                        try {                            ss.close();                            System.out.println(i);                            return i;                        } catch (IOException e) {                            e.printStackTrace();                        }                                            }                }            }        }        return -1;    }}