轻松搞定netty对话demo

项目结构

pom.xml

<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.1.24.Final</version>
</dependency>

server端

package com.tian.netty.first.server;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
/**
 * 服务端启动类
 *
 * @author lawt
 */
public class HelloServer {
/**
     * 服务端端口
     */
    private static final int PORT = 8081;
    public static void main(String[] args) {

//一个是boss线程一个是worker线程
      EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup);
            b.channel(NioServerSocketChannel.class);
            b.childHandler(new HelloServerInitializer());
            // 绑定端口监听
            ChannelFuture f = b.bind(PORT).sync();
            // 监听服务器关闭监听
            f.channel().closeFuture().sync();
            // 可以简写为
            /* b.bind(portNumber).sync().channel().closeFuture().sync(); */
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}

run HelloServer   

client端

package com.tian.netty.first.client;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import java.io.BufferedReader;
import java.io.InputStreamReader;
/**
 * 启动好了就可以在控制台输入内容，然后回车键
 *
 * @author lawt
 */
public class HelloClient {
private static String HOST = "127.0.0.1";
    private static int PORT = 8081;
    public static void main(String[] args) {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group)
                    .channel(NioSocketChannel.class)
                    .handler(new HelloClientInitializer());
            // 连接服务端
            Channel ch = b.connect(HOST, PORT).sync().channel();
            // 控制台输入
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            for (; ; ) {
                String line = in.readLine();
                if (line == null) {
continue;
                }
/**
                 * 向服务端发送在控制台输入的文本 并用"\r\n"结尾
                 * 之所以用\r\n结尾 是因为我们在handler中添加了 DelimiterBasedFrameDecoder 帧解码。
                 * 这个解码器是一个根据\n符号位分隔符的解码器。所以每条消息的最后必须加上\n否则无法识别和解码
                 * */
                ch.writeAndFlush(line + "\r\n");
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
// The connection is closed automatically on shutdown.
            group.shutdownGracefully();
        }
    }
}

package com.tian.netty.first.client;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.Delimiters;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
/**
 * @author lawt
 */
public class HelloClientInitializer extends ChannelInitializer<SocketChannel> {

@Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline pipeline = ch.pipeline();
        /**
         * 这个地方的 必须和服务端对应上。否则无法正常解码和编码
         *
         * 解码和编码 我将会在下一张为大家详细的讲解。再次暂时不做详细的描述
         *
         * */
        pipeline.addLast("framer", new DelimiterBasedFrameDecoder(
8192, Delimiters.lineDelimiter()));
        pipeline.addLast("decoder", new StringDecoder());
        pipeline.addLast("encoder", new StringEncoder());
        // 客户端的逻辑
        pipeline.addLast("handler", new HelloClientHandler());
    }
}

run HelloClient

输入：你好

服务端返回

server端收到

OK，这样一个netty demo就搞定了

代码下载地址：

https://github.com/sunmutian/springmvc4tian/tree/master/dubbo-demo

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