server端代码import com.chinadaas.bio.chinadaasbio.webSocket.handler.ServerHandler;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
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 Server {
public static void main(String[] args) throws Exception {
NioEventLoopGroup boosGroup = new NioEventLoopGroup(1);
NioEventLoopGroup workerGroup = new NioEventLoopGroup();
try {
ServerBootstrap serverBootstrap = new ServerBootstrap();
serverBootstrap.group(boosGroup, workerGroup);
serverBootstrap.channel(NioServerSocketChannel.class);
serverBootstrap.option(ChannelOption.SO_BACKLOG, 128);
serverBootstrap.option(ChannelOption.SO_KEEPALIVE, true);
serverBootstrap.handler(new LoggingHandler(LogLevel.INFO));
serverBootstrap.childHandler(new ChannelInitializer() {
@Override
protected void initChannel(SocketChannel socketChannel) throws Exception {
ChannelPipeline pipeline = socketChannel.pipeline();
// 因为是基于http的 所以使用http的编码和解析器
pipeline.addLast(new HttpServerCodec());
// 是以块方式写,添加ChunkWriteHandler() 处理器
pipeline.addLast(new ChunkedWriteHandler());
// http在传输过程中是分段的,这就是为什么当浏览器发送大量数据的时候,会发出多次http请求
pipeline.addLast(new HttpObjectAggregator(8192));
// 1:对应websocket 他的数据是以帧的形式传递
// 2: WebSocketServerProtocolHandler 功能是将http协议升级为ws协议,保持一个长连接
pipeline.addLast(new WebSocketServerProtocolHandler("/hello"));
// 添加自定义的handler
pipeline.addLast(new ServerHandler());
}
});
ChannelFuture channelFuture = serverBootstrap.bind(8886).sync();
channelFuture.channel().closeFuture().sync();
} finally {
boosGroup.shutdownGracefully();
workerGroup.shutdownGracefully();
}
}
}
ServerHandler 代码import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import java.time.LocalDateTime;
public class ServerHandler extends SimpleChannelInboundHandler {
@Override
protected void channelRead0(ChannelHandlerContext channelHandlerContext, TextWebSocketFrame textWebSocketFrame) throws Exception {
System.out.println("服务器收到消息:" + textWebSocketFrame.text());
channelHandlerContext.channel().writeAndFlush(new TextWebSocketFrame("服务器时间" + LocalDateTime.now() + " " + textWebSocketFrame.text()));
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
System.out.println(ctx.channel().remoteAddress()+"断开了连接");
}
}
websocket html 代码
Title
var socket;
if (window.WebSocket) {
socket = new WebSocket("ws://localhost:8886/hello")
socket.onmessage = function (ev) {
var rt = document.getElementById("responseText")
rt.value = rt.value + "\n" + ev.data;
}
socket.onopen = function (ev) {
var rt = document.getElementById("responseText")
rt.value = "连接开启了...";
}
socket.onclose = function (ev) {
var rt = document.getElementById("responseText")
rt.value = rt.value + "\n" + "连接关闭了";
}
} else {
alert("当前浏览器不支持websocket")
}
function send(message) {
if (!window.socket) {
return;
}
if (socket.readyState == WebSocket.OPEN) {
socket.send(message);
} else {
alert("连接没有开启...")
}
}
欢迎大家前来讨论