SpringBoot 2.7 集成 Netty 4 实现 UDP 通讯

1 摘要

Netty 作为异步通讯框架，支持多种协议。本文将介绍基于 SpringBoot 2.7 整合 Netty 4 实现 UDP 通讯。

2 核心 Maven 依赖

demo-netty-server/pom.xml

        <!-- Netty -->
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>${netty.version}</version>
        </dependency>

netty 版本:

<netty.version>4.1.96.Final</netty.version>

3 核心代码

3.1 服务端事务处理器(DemoUdpNettyServerHandler)

demo-netty-server/src/main/java/com/ljq/demo/springboot/netty/server/handler/DemoUdpNettyServerHandler.java

package com.ljq.demo.springboot.netty.server.handler;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.DatagramPacket;
import io.netty.util.concurrent.DefaultThreadFactory;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;


/**
 * @Description: UDP Netty 服务端事务处理器
 * @Author: junqiang.lu
 * @Date: 2023/8/25
 */
@Slf4j
@Component
@ChannelHandler.Sharable
public class DemoUdpNettyServerHandler extends SimpleChannelInboundHandler<DatagramPacket> {

    /**
     * 工作线程池
     */
    private final ExecutorService executorService = new ThreadPoolExecutor(4, 8, 60, TimeUnit.SECONDS,
            new LinkedBlockingQueue<>(10000), new DefaultThreadFactory("UDP-netty-work-pool"),
            new ThreadPoolExecutor.CallerRunsPolicy());

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket packet) throws Exception {
        ByteBuf byteBuf = packet.content();
        byte[] bytes = new byte[byteBuf.readableBytes()];
        byteBuf.readBytes(bytes);
        // 异步处理业务
        executorService.execute(() -> {
            // 读取数据
            log.info("UDP server receive client msg:" + new String(bytes));
            try {
                // 添加休眠，模拟业务处理
                Thread.sleep(5L);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        });
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        log.error("UDP server read message error", cause);
    }
}

代码说明: 这里使用线程池来异步处理事务，提高系统并发性能

3.2 服务端连接类(InitUdpNettyServer)

demo-netty-server/src/main/java/com/ljq/demo/springboot/netty/server/init/InitUdpNettyServer.java

package com.ljq.demo.springboot.netty.server.init;

import com.ljq.demo.springboot.netty.server.handler.DemoUdpNettyServerHandler;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.PooledByteBufAllocator;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioDatagramChannel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.net.InetSocketAddress;

/**
 * @Description: 初始化 udt netty 服务
 * @Author: junqiang.lu
 * @Date: 2023/8/25
 */
@Slf4j
@Component
public class InitUdpNettyServer implements ApplicationRunner {

    @Value("${netty.portUdp:9130}")
    private Integer nettyPort;

    @Resource
    private DemoUdpNettyServerHandler udpNettyServerHandler;

    @Override
    public void run(ApplicationArguments args) throws Exception {
        this.start();
    }

    /**
     * 启动服务
     *
     * @throws InterruptedException
     */
    public void start() throws InterruptedException {
        // 连接管理线程池
        EventLoopGroup mainGroup = new NioEventLoopGroup(2);
        EventLoopGroup workGroup = new NioEventLoopGroup(8);
        // 工作线程池
        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(mainGroup)
                // 指定 nio 通道，支持 UDP
                .channel(NioDatagramChannel.class)
                // 广播模式
                .option(ChannelOption.SO_BROADCAST, true)
                // 设置读取缓冲区大小为 10M
                .option(ChannelOption.SO_RCVBUF, 1024 * 1024 * 10)
                // 设置发送缓冲区大小为 10M
                .option(ChannelOption.SO_SNDBUF, 1024 * 1024 * 10)
                // 线程池复用缓冲区
                .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
                // 指定 socket 地址和端口
                .localAddress(new InetSocketAddress(nettyPort))
                // 添加通道 handler
                .handler(new ChannelInitializer<NioDatagramChannel>() {
                    @Override
                    protected void initChannel(NioDatagramChannel nioDatagramChannel) throws Exception {
                        nioDatagramChannel.pipeline()
                                // 指定工作线程，提高并发性能
                                .addLast(workGroup,udpNettyServerHandler);
                    }
                });
        // 异步绑定服务器，调用sync()方法阻塞等待直到绑定完成
        bootstrap.bind().sync();
        log.info("---------- [init] UDP netty server start ----------");
    }

}

代码说明：

UDP 协议需要使用 NioDatagramChannel.class 通道

设置缓冲区的大小有利于提高系统吞吐量，线程池复用也利于提升系统处理性能

3.3 客户端事务处理类(DemoUdpNettyClientHandler)

demo-netty-server/src/main/java/com/ljq/demo/springboot/netty/server/handler/DemoUdpNettyClientHandler.java

package com.ljq.demo.springboot.netty.server.handler;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.DatagramPacket;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

/**
 * @Description: UDP Netty 客户端事务处理器
 * @Author: junqiang.lu
 * @Date: 2023/8/25
 */
@Slf4j
@Component
@ChannelHandler.Sharable
public class DemoUdpNettyClientHandler extends SimpleChannelInboundHandler<DatagramPacket> {


    @Override
    protected void channelRead0(ChannelHandlerContext channelHandlerContext, DatagramPacket datagramPacket) throws Exception {
        // 读取数据
        ByteBuf byteBuf = datagramPacket.content();
        byte[] bytes = new byte[byteBuf.readableBytes()];
        byteBuf.readBytes(bytes);
        log.info("receive server msg:" + new String(bytes));
    }
}

3.4 客户端连接类(DemoUdpNettyClient)

demo-netty-server/src/main/java/com/ljq/demo/springboot/netty/server/client/DemoUdpNettyClient.java

package com.ljq.demo.springboot.netty.server.client;

import cn.hutool.core.util.RandomUtil;
import com.ljq.demo.springboot.netty.server.handler.DemoUdpNettyClientHandler;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.PooledByteBufAllocator;
import io.netty.buffer.Unpooled;
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.DatagramPacket;
import io.netty.channel.socket.nio.NioDatagramChannel;
import lombok.extern.slf4j.Slf4j;

import java.net.InetSocketAddress;

/**
 * @Description: UDP netty 客户端
 * @Author: junqiang.lu
 * @Date: 2023/8/25
 */
@Slf4j
public class DemoUdpNettyClient {

    private final String serverHost;

    private final int serverPort;

    private final int clientPort;

    private final EventLoopGroup mainGroup;

    private final Bootstrap bootstrap;

    private Channel channel;

    public DemoUdpNettyClient(String serverHost, int serverPort, int clientPort) {
        this.serverHost = serverHost;
        this.serverPort = serverPort;
        this.clientPort = clientPort;
        this.mainGroup = new NioEventLoopGroup();
        this.bootstrap = new Bootstrap();

    }

    public Channel getChannel() {
        return this.channel;
    }

    /**
     * 创建连接
     */
    public void connect() throws InterruptedException {
        bootstrap.group(mainGroup)
                .channel(NioDatagramChannel.class)
                .option(ChannelOption.SO_BROADCAST, true)
                .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
                .localAddress(clientPort)
                .handler(new DemoUdpNettyClientHandler());
        ChannelFuture future = bootstrap.bind().sync();
        this.channel = future.channel();
    }

    /**
     * 发送消息
     *
     * @param message
     */
    public void sendMessage(String message) {
        log.info("客户端待发送消息:{}", message);
        Channel channel = this.getChannel();
        byte[] resBytes = message.getBytes();
        DatagramPacket sendPacket = new DatagramPacket(Unpooled.copiedBuffer(resBytes), new InetSocketAddress(serverHost, serverPort));
        channel.writeAndFlush(sendPacket);
    }

    public void close() throws InterruptedException {
        log.info("关闭客户端");
        mainGroup.shutdownGracefully();
    }




    public static void main(String[] args) throws InterruptedException {
        String serverHost = "127.0.0.1";
        int serverPort = 9130;
        int clientPort = 9131;
        String message = RandomUtil.randomString(1024);
        DemoUdpNettyClient nettyClient = new DemoUdpNettyClient(serverHost, serverPort, clientPort);
        nettyClient.connect();
        for (int i = 0; i < 10000; i++) {
            nettyClient.sendMessage(message + i);
        }
        log.info("--------开始休眠 5 秒------------");
        Thread.sleep(5000L);
        log.info("--------休眠 5 秒结束------------");
        for (int i = 0; i < 5; i++) {
            nettyClient.sendMessage(i + message);
            Thread.sleep(100L);
        }
        Thread.sleep(5000L);
        nettyClient.close();
    }

}

这里包含了测试方法

4 高并发性能配置

• 1 在服务端事务处理类中使用异步处理消息

• Netty 服务端设置较高的读写缓存，提高吞吐量;

• 线程池复用缓冲区

                  // 设置读取缓冲区大小为 10M
                  .option(ChannelOption.SO_RCVBUF, 1024 * 1024 * 10)
                  // 设置发送缓冲区大小为 10M
                  .option(ChannelOption.SO_SNDBUF, 1024 * 1024 * 10)
                  // 线程池复用缓冲区
                  .option(ChannelOption.ALLOCATOR, PooledByteBufAllocator.DEFAULT)
  

• Netty 设置主现成以及工作线程，提升消息处理效率

  // 连接管理线程池
          EventLoopGroup mainGroup = new NioEventLoopGroup(2);
          EventLoopGroup workGroup = new NioEventLoopGroup(8);
          // 工作线程池
          Bootstrap bootstrap = new Bootstrap();
          bootstrap.group(mainGroup)
          
          ... ...
          
          // 添加通道 handler
                  .handler(new ChannelInitializer<NioDatagramChannel>() {
                      @Override
                      protected void initChannel(NioDatagramChannel nioDatagramChannel) throws Exception {
                          nioDatagramChannel.pipeline()
                                  // 指定工作线程，提高并发性能
                                  .addLast(workGroup,udpNettyServerHandler);
                      }
                  });
          
  

5 推荐参考资料

基于Netty实现UDP双向通信

Java入门：UDP协议发送/接收数据实现

读取tcp/udp默认缓冲区大小

Netty之UDP丢包解决

6 Github 源码

Gtihub 源码地址 : https://github.com/Flying9001/springBootDemo/tree/master/demo-netty-server

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