Netty
<dependency> <groupId>io.netty</groupId> <artifactId>netty-all</artifactId> <version>4.1.42.Final</version> </dependency>
package com.etc.websocket; import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.*; 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 MyServer { public static void main(String[] args) throws InterruptedException { // 创建2GE GROUp bossGroup wordGroup 线程组 // 默认 cpu 核数 * 2 EventLoopGroup bossGroup = new NioEventLoopGroup(1);// 处理连接 EventLoopGroup wordGroup = new NioEventLoopGroup();// 真正和客户端进行业务处理的。 就交给了wordGroup //启动服务端 ServerBootstrap bootstrap = new ServerBootstrap(); bootstrap.group(bossGroup, wordGroup) .channel(NioServerSocketChannel.class) .handler(new LoggingHandler(LogLevel.INFO)) .childHandler(new ChannelInitializer<SocketChannel>() { @Override protected void initChannel(SocketChannel ch) throws Exception { ChannelPipeline pipeline = ch.pipeline(); // 因为基于http协议 使用http编码器和解码器 pipeline.addLast(new HttpServerCodec()); // 以快的这种方式进行写入 pipeline.addLast(new ChunkedWriteHandler()); /** * http 数据在传输过程中是分段的. 就是可以将多个进行聚合 * 当浏览器发送大量数据. 就会发送多次http请求 */ pipeline.addLast(new HttpObjectAggregator(8192)); /** * 对应的websocket 他的数据一个帧来发送 * 浏览器的请求的地址 ws://localhost:7000/hello 这个是url */ pipeline.addLast(new WebSocketServerProtocolHandler("/hello")); pipeline.addLast(new MyTextWebSocketHanlder()); } }); ChannelFuture sync = bootstrap.bind(7000).sync(); sync.addListener(new ChannelFutureListener() { public void operationComplete(ChannelFuture future) throws Exception { if (future.isSuccess()){ System.out.println("websocket服务启动成功端口7000"); }else { System.out.println("ebsocket服务启动成功失败"); } } }); sync.channel().closeFuture().sync(); } }
package com.etc.websocket; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.handler.codec.http.websocketx.TextWebSocketFrame; import java.time.LocalDateTime; /** * @Author kalista * @Description * @Date 2020/9/7 14:34 **/ public class MyTextWebSocketHanlder extends SimpleChannelInboundHandler<TextWebSocketFrame> { /** * 服务器收到消息 * @param ctx * @param msg * @throws Exception */ @Override protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception { System.out.println("服务器收到消息了:" + msg.text()); ctx.channel().writeAndFlush(new TextWebSocketFrame("服务器时间:" + LocalDateTime.now() + msg.text())); } /** * 当web客户端连接后 触发方法 * @param ctx * @throws Exception */ @Override public void handlerAdded(ChannelHandlerContext ctx) throws Exception { //id 表示唯一的值,LongText 是唯一的 ShortText 不是唯一 System.out.println("handlerAdded 被调用" + ctx.channel().id().asLongText()); System.out.println("handlerAdded 被调用" + ctx.channel().id().asShortText()); } /** * 当连接断开后 * @param ctx * @throws Exception */ @Override public void handlerRemoved(ChannelHandlerContext ctx) throws Exception { System.out.println("有个连接断开:" + ctx.channel().id().asLongText()); } /** * 发送异常 * @param ctx * @param cause * @throws Exception */ @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception { System.out.println("异常:" + cause.getMessage()); ctx.close(); } }