SpringBoot搭建Netty+Socket+Tcp服务端和客户端

一: 服务端 

1: 启动类

package com.idc.config.netty;

import io.netty.bootstrap.ServerBootstrap;
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 lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import java.net.InetSocketAddress;

/**
 * @description: netty服务启动类
 **/

@Slf4j
@Component
public class NettyServer {

    public void start(InetSocketAddress address) {
        //配置服务端的NIO线程组
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try {
            ServerBootstrap bootstrap = new ServerBootstrap()
                    .group(bossGroup, workerGroup)  // 绑定线程池
                    .channel(NioServerSocketChannel.class)
                    .localAddress(address)
                    .childHandler(new NettyServerChannelInitializer())//编码解码
                    .option(ChannelOption.SO_BACKLOG, 128);  //服务端接受连接的队列长度，如果队列已满，客户端连接将被拒绝
//                    .childOption(ChannelOption.SO_KEEPALIVE, true);  //保持长连接，2小时无数据激活心跳机制

            // 绑定端口，开始接收进来的连接
            ChannelFuture future = bootstrap.bind(address).sync();
            log.info("ODF-Socket------netty服务器开始监听端口：" + address.getPort());
            //关闭channel和块，直到它被关闭
            future.channel().closeFuture().sync();
        } catch (Exception e) {
            e.printStackTrace();
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }

}

2: 处理程序

package com.idc.config.netty;

import com.idc.config.udpsocket.UdpServerHandler;
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;

/**
 * @description: 服务端初始化，客户端与服务器端连接一旦创建，这个类中方法就会被回调，设置出站编码器和入站解码器
 **/

public class NettyServerChannelInitializer extends ChannelInitializer<SocketChannel> {

    @Override
    protected void initChannel(SocketChannel channel) throws Exception {

        channel.pipeline().addLast("decoder",new StringDecoder(CharsetUtil.UTF_8));
        channel.pipeline().addLast("encoder",new StringEncoder(CharsetUtil.UTF_8));
        channel.pipeline().addLast(new NettyServerHandler());
    }
}

package com.idc.config.netty;

import com.idc.common.exception.CommonRuntimeException;
import com.idc.entity.odf.dto.LightingStatus;
import com.idc.mapper.OdfAlarmMapper;
import com.idc.mapper.OdfMapper;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelId;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.timeout.IdleState;
import io.netty.handler.timeout.IdleStateEvent;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.net.InetSocketAddress;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author wcybaonier
 * @description: netty服务端处理类
 **/

@Slf4j
@Component
public class NettyServerHandler extends ChannelInboundHandlerAdapter {

    @Resource
    private OdfMapper odfMapper;

    /**
     * 管理一个全局map，保存连接进服务端的通道数量
     */
    private static final ConcurrentHashMap<ChannelId, ChannelHandlerContext> CHANNEL_MAP = new ConcurrentHashMap<>();



    /**
     * @param ctx
     * @DESCRIPTION: 有客户端连接服务器会触发此函数
     * @return: void
     */
    @Override
    public void channelActive(ChannelHandlerContext ctx) {

        InetSocketAddress insocket = (InetSocketAddress) ctx.channel().remoteAddress();

        String clientIp = insocket.getAddress().getHostAddress();
        int clientPort = insocket.getPort();

        //获取连接通道唯一标识
        ChannelId channelId = ctx.channel().id();

        System.out.println();
        //如果map中不包含此连接，就保存连接
        if (CHANNEL_MAP.containsKey(channelId)) {
            log.info("ODF-Socket------客户端【" + channelId + "】是连接状态，连接通道数量: " + CHANNEL_MAP.size());
        } else {
            //保存连接
            CHANNEL_MAP.put(channelId, ctx);

            log.info("ODF-Socket------客户端【" + channelId + "】连接netty服务器[IP:" + clientIp + "--->PORT:" + clientPort + "]");
            log.info("ODF-Socket------连接通道数量: " + CHANNEL_MAP.size());
        }
    }

    /**
     * @param ctx
     * @DESCRIPTION: 有客户端终止连接服务器会触发此函数
     * @return: void
     */
    @Override
    public void channelInactive(ChannelHandlerContext ctx) {

        InetSocketAddress insocket = (InetSocketAddress) ctx.channel().remoteAddress();

        String clientIp = insocket.getAddress().getHostAddress();

        ChannelId channelId = ctx.channel().id();

        //包含此客户端才去删除
        if (CHANNEL_MAP.containsKey(channelId)) {
            //删除连接
            CHANNEL_MAP.remove(channelId);
            System.out.println();
            log.info("ODF-Socket------客户端【" + channelId + "】退出netty服务器[IP:" + clientIp + "--->PORT:" + insocket.getPort() + "]");
            log.info("ODF-Socket------连接通道数量: " + CHANNEL_MAP.size());
        }
    }

    /**
     * @param ctx
     * @DESCRIPTION: 有客户端发消息会触发此函数
     * @return: void
     */
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        if (msg == null){
            throw new CommonRuntimeException("ODF-Socket------加载客户端报文为空,请联系厂商!");
        }
        log.info("ODF-Socket------加载客户端报文......【" + ctx.channel().id() + "】" + " :" + msg);


        /**
         *  下面可以解析数据，保存数据，生成返回报文，将需要返回报文写入write函数
         *   在这里可以设置异步执行 提交任务到该channel的taskQueue 中
         */
        ctx.channel().eventLoop().execute(() -> {
            String msgStr = String.valueOf(msg);
            // 如果不包含逗号, 那么格式不对 约定格式为 : 序列号,deviceid,shelfNo,moduleNo,termNo,state
            if (!msgStr.contains(",")){
                throw new CommonRuntimeException("ODF-Socket------加载客户端报文格式不正确,请联系厂商!");
            }
            try {
                String[] split = msgStr.split(",");
                if (split.length != 6){
                    throw new CommonRuntimeException("ODF-Socket------加载客户端报文长度不正确,请联系厂商!");
                }
                //开始修改 admin
                LightingStatus lightingStatus = new LightingStatus();
                lightingStatus.setSerialNumber(split[0]);
                lightingStatus.setDeviceId(split[1]);
                lightingStatus.setShelfNo(split[2]);
                lightingStatus.setModuleNo(split[3]);
                lightingStatus.setTermNo(split[4]);
                lightingStatus.setState(split[5]);
                int i = odfMapper.updateTermStatus(lightingStatus);
                log.info("ODF-Socket------亮灯状态更新条数......【" + i + "】" );
            } catch (Exception e) {
                e.printStackTrace();
            }
        });

        /**
         * 可以设置多个异步任务
         * 但是这个会在上面异步任务执行完之后才执行
         */
        /*ctx.channel().eventLoop().execute(new Runnable() {
            @Override
            public void run() {
                try {
                    Thread.sleep(10*1000);
                    log.info(">>>>>>>>>休眠二十秒");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        });*/

        //响应客户端
        log.info("ODF-Socket------服务端端返回报文......【" + ctx.channel().id() + "】" + " :" + msg);
        this.channelWrite(ctx.channel().id(), msg);
    }

    /**
     * @param msg        需要发送的消息内容
     * @param channelId 连接通道唯一id
     * @DESCRIPTION: 服务端给客户端发送消息
     * @return: void
     */
    public void channelWrite(ChannelId channelId, Object msg) throws Exception {

        ChannelHandlerContext ctx = CHANNEL_MAP.get(channelId);

        if (ctx == null) {
            log.info("ODF-Socket------通道【" + channelId + "】不存在");
            return;
        }

        if (msg == null || msg == "") {
            log.info("ODF-Socket------服务端响应空的消息");
            return;
        }

        //将客户端的信息直接返回写入ctx
        ctx.write(msg);
        //刷新缓存区
        ctx.flush();
    }

    public static void main(String[] args) {
        System.out.println("序列号,deviceid,shelfNo,moduleNo,termNo,state".split(",").length);
    }

    @Override
    public void userEventTriggered(ChannelHandlerContext ctx, Object evt) throws Exception {

        String socketString = ctx.channel().remoteAddress().toString();

        if (evt instanceof IdleStateEvent) {
            IdleStateEvent event = (IdleStateEvent) evt;
            if (event.state() == IdleState.READER_IDLE) {
                log.info("ODF-Socket------Client: " + socketString + " READER_IDLE 读超时");
                ctx.disconnect();
            } else if (event.state() == IdleState.WRITER_IDLE) {
                log.info("ODF-Socket------Client: " + socketString + " WRITER_IDLE 写超时");
                ctx.disconnect();
            } else if (event.state() == IdleState.ALL_IDLE) {
                log.info("ODF-Socket------Client: " + socketString + " ALL_IDLE 总超时");
                ctx.disconnect();
            }
        }
    }

    /**
     * @param ctx
     * @DESCRIPTION: 发生异常会触发此函数
     * @return: void
     */
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {

        System.out.println();
        ctx.close();
        log.info("ODF-Socket------"+ctx.channel().id() + " 发生了错误,此连接被关闭" + "此时连通数量: " + CHANNEL_MAP.size());
        //cause.printStackTrace();
    }
}

3: 项目启动类

package com.idc;

import com.idc.config.udpsocket.UdpServer;
import lombok.extern.slf4j.Slf4j;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;

import javax.annotation.Resource;

/**
 * @author wcybaonier
 */
@MapperScan("com.idc.mapper")
@SpringBootApplication
@Slf4j
@EnableScheduling
public class IdcPduApplication implements CommandLineRunner {

    @Value("${netty.host}")
    private String host;

    @Value("${netty.port}")
    private Integer port;

    @Resource
    private NettyServer nettyServer;

    public static void main(String[] args) {
        SpringApplication.run(IdcPduApplication.class, args);
        log.info("IdcPduApplication 启动成功！");
    }

    /**
     * netty服务启动
     * @param args
     * @throws Exception
     */
    @Override
    public void run(String... args) throws Exception {
        //tcp实现 
        InetSocketAddress address = new InetSocketAddress(host,port);
        log.info("neety服务器启动地址: "+host+":"+ port);
        nettyServer.start(address);
    }
}

yml配置: 

# 配置Netty通信IP和端口
netty:
  port: 7101
  host: 127.0.0.1

完成,启动项目即可自动监听对应端口

二: 客户端

1: 启动类

这里为了测试,写了Main方法,可以参考服务端,配置启动类 ,实现跟随项目启动

package com.ws.aa;

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.CharsetUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Springboot整合Netty，实现Socket信息交互（本项目用于与C语言程序进行交互）
 * 
 * 核心文件（与服务端进行数据交互）
 * 
 * 客户端
 *
 * @author 小辰哥哥
 */
public class SocketClient {
    // 服务端IP
    static final String HOST = System.getProperty("host", "134.95.3.134");

    // 服务端开放端口
    static final int PORT = Integer.parseInt(System.getProperty("port", "7101"));

    // 数据包大小
    static final int SIZE = Integer.parseInt(System.getProperty("size", "256"));

    // 日志打印
    private static final Logger LOGGER = LoggerFactory.getLogger(SocketClient.class);

    // 主函数启动
    public static void main(String[] args) throws InterruptedException {
        sendMessage("1,deviceid123,shelfNo123,moduleNo123,termNo123,state123");
    }

    /**
     * 核心方法（处理：服务端向客户端发送的数据、客户端向服务端发送的数据）
     *
     * @param content
     * @throws InterruptedException
     * @author 小辰哥哥
     */
    public static void sendMessage(String content) throws InterruptedException {
        // Configure the client.
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group)
                    .channel(NioSocketChannel.class)
                    .option(ChannelOption.TCP_NODELAY, true)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        public void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline p = ch.pipeline();
                            p.addLast("decoder", new StringDecoder(CharsetUtil.UTF_8));
                            p.addLast("encoder", new StringEncoder(CharsetUtil.UTF_8));
                            p.addLast(new SocketHandler() {
                                @Override
                                public void channelRead(ChannelHandlerContext ctx, Object msg) {
                                    LOGGER.debug("####接收服务端发送过来的消息####");
                                    LOGGER.debug("服务端发送过来的数据：" + msg);

                                    // 主动与服务端断开连接（客户端触发）
                                    //ctx.channel().close();
                                }
                            });
                        }
                    });

            ChannelFuture future = b.connect(HOST, PORT).sync();
            future.channel().writeAndFlush(content);

            // 程序阻塞
            future.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully();
        }
    }

}

2: 处理程序

package com.ws.aa;

import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
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;

import java.util.logging.SocketHandler;

/**
 * Springboot整合Netty，实现Socket信息交互（本项目用于与C语言程序进行交互）
 *
 * 设置出站和入站的编码器和解码器（该方法在SocketClientConfig.java中被重写）
 *
 * 客户端
 *
 * @author wcybaonier
 */

public class SocketChannelInitializer extends ChannelInitializer<SocketChannel> {
    protected void initChannel(SocketChannel channel) throws Exception {
        ChannelPipeline p = channel.pipeline();
        p.addLast("decoder", new StringDecoder(CharsetUtil.UTF_8));
        p.addLast("encoder", new StringEncoder(CharsetUtil.UTF_8));
        p.addLast((ChannelHandler) new SocketHandler());
    }
}

package com.ws.aa;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Springboot整合Netty，实现Socket信息交互（本项目用于与C语言程序进行交互）
 *
 * 初始化操作、接受服务端发送过来的消息（该方法在SocketClient.java中被重写）
 *
 * 客户端
 *
 * @author wcybaonier
 */

public class SocketHandler extends ChannelInboundHandlerAdapter {

    // 日志打印
    private static final Logger LOGGER = LoggerFactory.getLogger(SocketHandler.class);

    @Override
    public void channelActive(ChannelHandlerContext ctx) {
        LOGGER.debug("SocketHandler Active（客户端）");
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) {
        LOGGER.debug("####接收服务端发送过来的消息####");
        LOGGER.debug("SocketHandler read Message：" + msg);
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        LOGGER.debug("####客户端断开连接####");
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
        cause.printStackTrace();
        ctx.close();
    }
}

3: 项目启动类

......想写就参考服务端......

三: 测试,完成

有测试的,,,但是忘记截图了................文章来源地址https://www.toymoban.com/news/detail-606057.html

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