2、netty3服务端入门代码示例

最新推荐文章于 2025-05-17 12:10:58 发布

Roro_Lee

最新推荐文章于 2025-05-17 12:10:58 发布

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分类专栏： netty socket 文章标签： netty

本文链接：https://blog.youkuaiyun.com/lz70523/article/details/78123744

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本文介绍了一个简单的Netty服务端实现案例，通过创建ServerBootstrap来配置Netty服务，并使用NioServerSocketChannelFactory进行初始化。此外，还展示了如何定义ChannelPipeline以处理消息收发及异常情况。

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package com.server;

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());//上行
                pipeline.addLast("encoder", new StringEncoder());//下行
                pipeline.addLast("helloHandler", new HelloHandler());
                return pipeline;
            }
        });

        bootstrap.bind(new InetSocketAddress(10101));

        System.out.println("start!!!");

    }

}

package com.server;

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 {
        String s = (String) e.getMessage();
        System.out.println(s);
        //回写数据
        ctx.getChannel().write("hi");
        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);
    }
}