Springboot前后端通过TCP通信学习总结

在Spring Boot中，前后端通过TCP通信可以使用Netty框架来实现。以下是一个简单的例子，展示了如何在Spring Boot应用中设置Netty服务器，并处理来自客户端的TCP连接和数据。

1. 添加依赖到pom.xml：

<dependency>
    <groupId>io.netty</groupId>
    <artifactId>netty-all</artifactId>
    <version>4.1.69.Final</version>
</dependency>

2. 创建Netty服务器配置类：

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import org.springframework.stereotype.Component;
 
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import java.net.InetSocketAddress;
 
@Component
public class NettyTCPServer {
 
    private EventLoopGroup bossGroup = new NioEventLoopGroup();
    private EventLoopGroup workerGroup = new NioEventLoopGroup();
    private ServerBootstrap bootstrap;
 
    @PostConstruct
    public void start() {
        bootstrap = new ServerBootstrap();
        bootstrap.group(bossGroup, workerGroup)
                .channel(NioServerSocketChannel.class)
                .localAddress(new InetSocketAddress("localhost", 8080))
                .childHandler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    public void initChannel(SocketChannel ch) {
                        // 添加自定义的ChannelHandler处理业务逻辑
                    }
                });
 
        try {
            bootstrap.bind().sync();
            System.out.println("TCP服务器启动在端口: 8080");
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }
    }
 
    @PreDestroy
    public void stop() {
        bossGroup.shutdownGracefully();
        workerGroup.shutdownGracefully();
    }
}

3. 创建自定义的ChannelHandler处理业务逻辑：

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
 
public class TCPServerHandler extends SimpleChannelInboundHandler<String> {
 
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) {
        // 处理接收到的消息
        System.out.println("接收到消息