java 网络通信 netty websocket Hello World（基于Netty5.0）

• 服务器端

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
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 io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpServerCodec;
import io.netty.handler.stream.ChunkedWriteHandler;

public class WebSocketServer {
    
    public void run(int port){
        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            ServerBootstrap b = new ServerBootstrap();
            b.group(bossGroup, workerGroup)
             .channel(NioServerSocketChannel.class)
             .childHandler(new ChannelInitializer() {
                @Override
                protected void initChannel(SocketChannel ch) throws Exception {
                    //HttpServerCodec将请求和应答消息编码或解码为HTTP消息
                    //通常接收到的http是一个片段，如果想要完整接受一次请求所有数据，我们需要绑定HttpObjectAggregator
                    //然后就可以收到一个FullHttpRequest完整的请求信息了
                    //ChunkedWriteHandler 向客户端发送HTML5文件，主要用于支持浏览器和服务器进行WebSocket通信
                    //WebSocketServerHandler自定义Handler
                    ch.pipeline().addLast("http-codec", new HttpServerCodec())
                                 .addLast("aggregator", new HttpObjectAggregator(65536)) //定义缓冲大小
                                 .addLast("http-chunked", new ChunkedWriteHandler())
                                 .addLast("handler", new WebSocketServerHandler());
                }
            });
            
            ChannelFuture f = b.bind(port).sync();
            System.out.println("start...");
            f.channel().closeFuture().sync();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            workerGroup.shutdownGracefully();
            bossGroup.shutdownGracefully();
        }
    }
    
    public static void main(String[] args) {
        new WebSocketServer().run(7777);
    }
}

• 服务器端处理器

import java.util.logging.Level;
import java.util.logging.Logger;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.DefaultFullHttpResponse;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaderUtil;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
import io.netty.handler.codec.http.websocketx.PongWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker;
import io.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory;
import io.netty.util.CharsetUtil;

public class WebSocketServerHandler extends SimpleChannelInboundHandler