Netty进阶 -- WebSocket长连接开发

客户端

 

服务器内容

 

[](()❇️后端源码

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MyWebSocketServer

package com.wanshi.netty.websocket;

import io.netty.bootstrap.ServerBootstrap;

import io.netty.channel.ChannelFuture;

import io.netty.channel.ChannelInitializer;

import io.netty.channel.ChannelPipeline;

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 io.netty.handler.codec.http.HttpObjectAggregator;

import io.netty.handler.codec.http.HttpServerCodec;

import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler;

import io.netty.handler.logging.LogLevel;

import io.netty.handler.logging.LoggingHandler;

public class MyWebSocketServer {

public static void main(String[] args) {

//创建2个线程组

EventLoopGroup boosGroup = new NioEventLoopGroup(1);

EventLoopGroup workerGroup = new NioEventLoopGroup();

try {

//创建服务器监听

ServerBootstrap serverBootstrap = new ServerBootstrap();

//添加前置参数

serverBootstrap.group(boosGroup, workerGroup)

.channel(NioServerSocketChannel.class)

.handler(new LoggingHandler(LogLevel.INFO))

.childHandler(new ChannelInitializer() {

@Override

protected void initChannel(SocketChannel ch) throws Exception {

ChannelPipeline pipeline = ch.pipeline();

//因为基于http协议，使用http的编码和解码器

pipeline.addLast(new HttpServerCodec());

//是以块方式写，添加ChunkedWriteHandler处理器

pipeline.addLast(new HttpObjectAggregator(8192));

pipeline.addLast(new WebSocketServerProtocolHandler(“/hello2”));

pipeline.addLast(ne 《大厂前端面试题解析+Web核心总结学习笔记+企业项目实战源码+最新高清讲解视频》无偿开源 徽信搜索公众号【编程进阶路】 w MyWebSocketServerHandler());

}

});

ChannelFuture channelFuture = serverBootstrap.bind(7000).sync();

channelFuture.channel().closeFuture().sync();

} catch (Exception e) {

e.printStackTrace();

} finally {

boosGroup.shutdownGracefully();

workerGroup.shutdownGracefully();

}

}

}

核心业务处理器MyWebSocketServerHandler

package com.wanshi.netty.websocket;

import io.netty.channel.ChannelHandlerContext;

import io.netty.channel.SimpleChannelInboundHandler;

import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;

import java.text.SimpleDateFormat;

import java.time.LocalDateTime;

import java.util.Date;

public class MyWebSocketServerHandler extends SimpleChannelInboundHandler {

private SimpleDateFormat sdf = new SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”);

@Override

protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {

System.out.println(“服务器接受消息：” + msg.text());

ctx.channel().writeAndFlush(new TextWebSocketFrame(“服务器时间：” + sdf.format(new Date()) + " – 消息：" + msg.text()));

}

@Override

public void handlerAdded(ChannelHandlerContext ctx) throws Exception {

System.out.println(“handlerAdded被调用：” + ctx.channel().id().asLongText());

System.out.println(“handlerAdded被调用：” + ctx.channel().id().asShortText());

System.out.println(sdf.format(new Date()) + " 【服务器】用户已连接！");

}

@Override

public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {

System.out.println(“handlerRemoved被调用：” + ctx.channel().id().asLongText());