SpringBoot 集成Netty实现UDP Server

注：ApplicationRunner 接口是在容器启动成功后的最后一步回调（类似开机自启动）。

UDPServer

package com.vmware.vCenterEvent.netty;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioDatagramChannel;
import lombok.extern.log4j.Log4j2;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.stereotype.Component;

@Log4j2
@Component
public class UdpServer implements ApplicationRunner {

    private final Bootstrap bootstrap;

    private final NioEventLoopGroup group;

    private Channel channel;

    private void Start() throws InterruptedException {
        try {
            channel = bootstrap.bind("0.0.0.0", 8888).sync().channel();
            System.out.println("UdpServer start success");
            channel.closeFuture().await();
        } finally {
            group.shutdownGracefully();
        }
    }

    private static final class NettyUdpServerHolder {
        static final NettyUdpServer INSTANCE = new NettyUdpServer();
    }

    public static NettyUdpServer getInstance() {
        return NettyUdpServerHolder.INSTANCE;
    }

    private NettyUdpServer() {
        group = new NioEventLoopGroup();
        bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioDatagramChannel.class)
                .option(ChannelOption.SO_BROADCAST, true)
                .option(ChannelOption.SO_RCVBUF, 1024 * 1024 * 100)
                .handler(new ChannelInitializer<Channel>() {
                    @Override
                    protected void initChannel(Channel channel) throws Exception {
                        ChannelPipeline pipeline = channel.pipeline();
                        pipeline.addLast(new NettyUdpServerHandler());
                    }
                });
    }

    @Override
    public void run(ApplicationArguments args) throws Exception {
        NettyUdpServer.getInstance().Start();
    }
}

UDPServerHandler

import com.vmware.vCenterEvent.domain.Syslog;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.socket.DatagramPacket;
import io.netty.util.CharsetUtil;
import lombok.extern.log4j.Log4j2;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.jms.core.JmsMessagingTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;

@Log4j2
@Component
public class NettyUdpServerHandler extends SimpleChannelInboundHandler<DatagramPacket> {

    public static NettyUdpServerHandler nettyUdpServerHandler;

    @Autowired
    private JmsMessagingTemplate jmsMessagingTemplate;

    public NettyUdpServerHandler(){
    }

    @PostConstruct
    public void init(){
        nettyUdpServerHandler = this;
        nettyUdpServerHandler.jmsMessagingTemplate = this.jmsMessagingTemplate;
    }

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, DatagramPacket msg) {
        // log.info("开始接收数据");
        String msgString = msg.content().toString(CharsetUtil.UTF_8);

　　　　 // 将接收到数据放入ActiveMQ队列中
        nettyUdpServerHandler.jmsMessagingTemplate.convertAndSend("mq", msgString);
    }

}