SpringBoot Webflux創建TCP/UDP server並使用handler解析數據

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.3.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>demo</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>demo</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-webflux</artifactId>
		</dependency>
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

package com.example.demo;
import com.example.demo.handler.TcpDecoderHanlder;
import com.example.demo.handler.UdpDecoderHanlder;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import reactor.core.publisher.Flux;
import reactor.netty.tcp.TcpServer;
import reactor.netty.udp.UdpServer;
import java.time.Duration;
@SpringBootApplication
public class DemoApplication {
	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}
	@Bean
	CommandLineRunner serverRunner(UdpDecoderHandler udpDecoderHandler, TcpDecoderHandler tcpDecoderHandler) {
		return strings -> {
			createUdpServer(udpDecoderHandler);
			createTcpServer(tcpDecoderHandler);
		};
	}
	/**
	 * 創建UDP Server
	 * @param udpDecoderHanlder： 解析UDP Client上報數據handler
	 */
	private void createUdpServer(UdpDecoderHandler udpDecoderHandler) {
		UdpServer.create()
				.handle((in,out) -> {
					in.receive()
							.asByteArray()
							.subscribe();
					return Flux.never();
				})
				.port(8888)
				.doOnBound(conn -> conn.addHandlerLast("decoder",udpDecoderHandler)) //可以添加多個handler
				.bindNow(Duration.ofSeconds(30));
	}
	/**
	 * 創建TCP Server
	 * @param tcpDecoderHanlder： 解析TCP Client上報數據的handler
	 */
	private void createTcpServer(TcpDecoderHandler tcpDecoderHandler) {
		TcpServer.create()
				.handle((in,out) -> {
					in.receive()
							.asByteArray()
							.subscribe();
					return Flux.never();
				})
				.doOnConnection(conn ->
						conn.addHandler(tcpDecoderHandler)) //實例隻寫瞭如何添加handler,可添加delimiter，tcp生命周期，decoder，encoder等handler
				.port(9999)
				.bindNow();
	}
}

package com.example.demo.handler;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.socket.DatagramPacket;
import io.netty.handler.codec.MessageToMessageDecoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UdpDecoderHandler extends MessageToMessageDecoder<DatagramPacket>  {
    private static final Logger LOGGER = LoggerFactory.getLogger(TcpDecoderHandler.class);
    @Override
    protected void decode(ChannelHandlerContext channelHandlerContext, DatagramPacket byteBuf, List<Object> list) throws Exception {
        ByteBuf byteBuf1 = byteBuf.content();
        int size = byteBuf1.readableBytes();
        byte[] data = new byte[size];
        byteBuf1.readBytes(data);
        LOGGER.info(new String(data));
    }
}

package com.example.demo.handler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToMessageDecoder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class TcpDecoderHandler extends MessageToMessageDecoder  {
    private static final Logger LOGGER = LoggerFactory.getLogger(TcpDecoderHandler.class);
    @Override
    protected void decode(ChannelHandlerContext channelHandlerContext, Object o, List list){
        LOGGER.info("解析client上報數據");
    }
}