Netty 4 整合到 Springboot

96
毛宇鹏
0.1 2018.04.25 11:57 字数 72

Netty 4 整合到 Springboot

项目搭建

添加依赖包

    <!--Netty-->
    <dependency>
        <groupId>io.netty</groupId>
        <artifactId>netty-all</artifactId>
        <version>4.0.36.Final</version>
    </dependency>
    <!--Netty END-->

修改配置文件

  1. application.properties重命名为application.yml

  2. 添加以下配置:

    n:
      port: 7000
      url: 127.0.0.1
    

编写服务端

NettyServer.java

package club.maoyupeng.demo.sslnetty.web.socket.server;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Component;

import java.net.InetSocketAddress;

/**
 * <b>标题:  Netty 服务  </b><br />
 * <pre>
 * </pre>
 *
 * @author 毛宇鹏
 * @date 创建于 上午9:02 2018/4/25
 */
@Component
public class NettyServer {

    private static final Logger log = Logger.getLogger(NettyServer.class);

    private final EventLoopGroup bossGroup = new NioEventLoopGroup();
    private final EventLoopGroup workerGroup = new NioEventLoopGroup();

    private Channel channel;

    /**
     * 启动服务
     */
    public ChannelFuture run (InetSocketAddress address) {

        ChannelFuture f = null;
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new ServerChannelInitializer())
                    .option(ChannelOption.SO_BACKLOG, 128)
                    .childOption(ChannelOption.SO_KEEPALIVE, true);

            f = b.bind(address).syncUninterruptibly();
            channel = f.channel();
        } catch (Exception e) {
            log.error("Netty start error:", e);
        } finally {
            if (f != null && f.isSuccess()) {
                log.info("Netty server listening " + address.getHostName() + " on port " + address.getPort() + " and ready for connections...");
            } else {
                log.error("Netty server start up Error!");
            }
        }

        return f;
    }

    public void destroy() {
        log.info("Shutdown Netty Server...");
        if(channel != null) { channel.close();}
        workerGroup.shutdownGracefully();
        bossGroup.shutdownGracefully();
        log.info("Shutdown Netty Server Success!");
    }
}

ServerChannelInitializer.java

package club.maoyupeng.demo.sslnetty.web.socket.server;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.CharsetUtil;

/**
 * <b>标题:    </b><br />
 * <pre>
 * </pre>
 *
 * @author 毛宇鹏
 * @date 创建于 上午9:13 2018/4/25
 */
public class ServerChannelInitializer extends ChannelInitializer<SocketChannel> {
    @Override
    protected void initChannel(SocketChannel socketChannel) {
        // 解码编码
        socketChannel.pipeline().addLast(new StringDecoder(CharsetUtil.UTF_8));
        socketChannel.pipeline().addLast(new StringEncoder(CharsetUtil.UTF_8));

        socketChannel.pipeline().addLast(new ServerHandler());
    }
}

ServerHandler.java

package club.maoyupeng.demo.sslnetty.web.socket.server;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

/**
 * <b>标题:    </b><br />
 * <pre>
 * </pre>
 *
 * @author 毛宇鹏
 * @date 创建于 上午9:14 2018/4/25
 */
public class ServerHandler extends SimpleChannelInboundHandler<Object> {

    @Override
    public void channelRead0(ChannelHandlerContext ctx, Object msg) {
        System.out.println("server receive message :"+ msg);
        ctx.channel().writeAndFlush("yes server already accept your message" + msg);
        ctx.close();
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        System.out.println("channelActive>>>>>>>>");
    }
}

编写客户端

NettyClient.java

package club.maoyupeng.demo.sslnetty.web.socket.client;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.AttributeKey;
import io.netty.util.CharsetUtil;
import org.apache.log4j.Logger;

import java.net.InetSocketAddress;

/**
 * <b>标题:    </b><br />
 * <pre>
 * </pre>
 *
 * @author 毛宇鹏
 * @date 创建于 上午10:56 2018/4/25
 */
public class NettyClient {

    private static final Logger log = Logger.getLogger(NettyClient.class);

    private static Bootstrap b;
    private static ChannelFuture f;
    private static final EventLoopGroup workerGroup = new NioEventLoopGroup();

    private static void init () {
        try {
            log.info("init...");
            b = new Bootstrap();
            b.group(workerGroup);
            b.channel(NioSocketChannel.class);
            b.option(ChannelOption.SO_KEEPALIVE, true);
            b.handler(new ChannelInitializer<SocketChannel>() {
                @Override
                protected void initChannel(SocketChannel socketChannel) {
                    // 解码编码
                    socketChannel.pipeline().addLast(new StringDecoder(CharsetUtil.UTF_8));
                    socketChannel.pipeline().addLast(new StringEncoder(CharsetUtil.UTF_8));

                    socketChannel.pipeline().addLast(new ClientHandler());
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Object startAndWrite(InetSocketAddress address, Object send) throws InterruptedException {
        init();
        f = b.connect(address).sync();
        // 传数据给服务端
        f.channel().writeAndFlush(send);
        f.channel().closeFuture().sync();
        return f.channel().attr(AttributeKey.valueOf("Attribute_key")).get();
    }

    public static void main(String[] args) {
        InetSocketAddress address = new InetSocketAddress("127.0.0.1", 7000);
        String message = "hello";
        try {
            Object result = NettyClient.startAndWrite(address, message);
            log.info("....result:" + result);
        } catch (Exception e) {
            log.error(e.getMessage());
        } finally {
            f.channel().close();
            workerGroup.shutdownGracefully();
            log.info("Closed client!");
        }
    }
}

ClientHandler.java

package club.maoyupeng.demo.sslnetty.web.socket.client;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.util.AttributeKey;

/**
 * <b>标题:    </b><br />
 * <pre>
 * </pre>
 *
 * @author 毛宇鹏
 * @date 创建于 上午11:25 2018/4/25
 */
public class ClientHandler extends SimpleChannelInboundHandler<Object> {
    @Override
    protected void channelRead0(ChannelHandlerContext channelHandlerContext, Object msg) {
        channelHandlerContext.channel().attr(AttributeKey.valueOf("Attribute_key")).set(msg);
        channelHandlerContext.close();
    }
}

配置 Springboot 启动

package club.maoyupeng.demo.sslnetty;

import club.maoyupeng.demo.sslnetty.web.socket.server.NettyServer;
import io.netty.channel.ChannelFuture;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

import java.net.InetSocketAddress;

/**
 * @author 毛宇鹏  http://www.maoyupeng.club
 */
@SpringBootApplication
public class SslNettyApplication implements CommandLineRunner {

    @Value("${n.port}")
    private int port;

    @Value("${n.url}")
    private String url;

    @Autowired
    private NettyServer socketServer;

    public static void main(String[] args) {
        SpringApplication.run(SslNettyApplication.class, args);
    }

    @Override
    public void run(String... strings) {
        InetSocketAddress address = new InetSocketAddress(url, port);
        ChannelFuture future = socketServer.run(address);
        Runtime.getRuntime().addShutdownHook(new Thread(){
            @Override
            public void run() {
                socketServer.destroy();
            }
        });
        future.channel().closeFuture().syncUninterruptibly();
    }
}

Spring boot
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