Netty websocekt

作者: holmes000 | 来源:发表于2020-05-05 17:33 被阅读0次

Netty websocekt
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https://gitee.com/henan000/netty
WebSocketServerProtocolHandler主要是靠是这个类去将http转换成ws
通过一个状态来切换 101

image.png

package com.whn.text.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.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;
import io.netty.handler.stream.ChunkedWriteHandler;


public class WebsocketServer {
    public static void main(String[] args) throws InterruptedException {
        NioEventLoopGroup bossGroup = new NioEventLoopGroup(1);
        NioEventLoopGroup workGroup = new NioEventLoopGroup();

        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup, workGroup).
                    channel(NioServerSocketChannel.class).
                    handler(new LoggingHandler(LogLevel.INFO)).
                    childHandler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            ChannelPipeline channelPipeline = ch.pipeline();
                            channelPipeline.addLast(new HttpServerCodec());
                            channelPipeline.addLast(new ChunkedWriteHandler());
                            channelPipeline.addLast(new HttpObjectAggregator(8192));
                            //ws://localhost:7000/test
                            channelPipeline.addLast(new WebSocketServerProtocolHandler("/test"));
                            channelPipeline.addLast(new WebsocketHandler());
                        }
                    });
            System.out.println("服务端准备完毕。。。");
            ChannelFuture channelFuture = serverBootstrap.bind(7000).sync();
            channelFuture.channel().closeFuture().sync();
        } finally {
            bossGroup.shutdownGracefully();
            workGroup.shutdownGracefully();
        }
    }
}

package com.whn.text.websocket;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;

import java.time.LocalDateTime;

public class WebsocketHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {


    @Override
    protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
        System.out.println("服务器收到消息：" + msg.text());

        ctx.writeAndFlush(new TextWebSocketFrame("服务器时间" + LocalDateTime.now() + "::" + msg.text()));
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        System.out.println("handlerAdded 被调用" + ctx.channel().id().asLongText());
    }


    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        System.out.println("handlerRemoved 被调用" + ctx.channel().id().asLongText());
    }


    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        ctx.close();
    }
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    var socket;
    if (window.WebSocket) {
        socket = new WebSocket("ws://localhost:7000/test");
        socket.onmessage = function (ev) {
            var r = document.getElementById('responseText');
            r.value = r.value + "\n" + ev.data;
        }
        socket.onopen = function (ev) {
            var r = document.getElementById('responseText');
            r.value = "连接开启。。。"
        }
        socket.onclose = function (ev) {
            var r = document.getElementById('responseText');
            r.value = r.value + "\n" + "连接关闭。。。"
        }
    } else {
        alert("当前浏览器不支持websocket")
    }

    function send(msg) {
        if (!window.socket) {
            return;
        }
        if (socket.readyState == WebSocket.OPEN) {
            socket.send(msg)
        } else {
            alert("连接没开启");
        }
    }

</script>
    <form onsubmit="return false">
        <textarea name="msg" style="height: 100px;width: 100px"></textarea>
        <input type="button" value="发送消息" onclick="send(this.form.msg.value)">
        <textarea id="responseText" style="height: 100px;width: 100px"></textarea>
        <input type="button" value="请空内容" onclick="document.getElementById('responseText').value=''">
    </form>

</body>
</html>