Netty服務器和客戶端交互案例

Netty服務器和客戶端交互案例

簡述：使用netty完成通訊簡單的例子

服務器端代碼：

package netty;

import java.net.InetSocketAddress;
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;

public class Server {
    public static void main(String[] args) {
        ServerBootstrap serverBootstrap = new ServerBootstrap();
        serverBootstrap.setFactory(new NioServerSocketChannelFactory(Executors.newCachedThreadPool(), 
        Executors.newCachedThreadPool()));

        serverBootstrap.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;
            }
        });

        serverBootstrap.bind(new InetSocketAddress(9999));

        System.out.println("服務器啓動");
    }
}

服務器自定義攔截器：

package netty;

import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.ChannelStateEvent;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;

public class HelloHandler extends SimpleChannelHandler{

    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {

        String s = (String) e.getMessage();
        System.out.println("服務器接收數據："+s);

        super.messageReceived(ctx, e);
    }

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

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

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

    @Override
    public void channelOpen(ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
        System.out.println("channelClosed");
        super.channelOpen(ctx, e);
    }

}

客戶端代碼：

package netty;

import java.net.InetSocketAddress;
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;

public class Clinet {
    public static void main(String[] args) {
        ClientBootstrap clientBootstrap = new ClientBootstrap();

        //線程池
        ExecutorService boss = Executors.newCachedThreadPool();
        ExecutorService worker = Executors.newCachedThreadPool();

        //socket工廠
        clientBootstrap.setFactory(new NioClientSocketChannelFactory(boss, worker));

        //管道工廠
        clientBootstrap.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;
            }
        });
        System.out.println("client start!");
        //連接服務端
        ChannelFuture connect = clientBootstrap.connect(new InetSocketAddress("127.0.0.1", 9999));
        Channel channel = connect.getChannel();
        System.out.println("客戶端發送數據");
        channel.write("客戶端數據");
    }
}

客戶端自定義攔截器：

package netty;

import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;

public class HiHandler extends SimpleChannelHandler{

    @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) throws Exception {

        String s = (String) e.getMessage();
        System.out.println("客戶端接收數據"+s);

        super.messageReceived(ctx, e);
    }


}