Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package ca.lambtoncollege.netty.webSocket; import io.netty.channel.Channel; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelPromise; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.handler.codec.http.FullHttpResponse; import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame; import io.netty.handler.codec.http.websocketx.PongWebSocketFrame; import io.netty.handler.codec.http.websocketx.TextWebSocketFrame; import io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker; import io.netty.handler.codec.http.websocketx.WebSocketFrame; import io.netty.util.CharsetUtil; /** * * @author c0647015 */ public class ClientHandlerWebSocket extends SimpleChannelInboundHandler<Object> { private final WebSocketClientHandshaker handshaker; private ChannelPromise handshakeFuture; public ClientHandlerWebSocket(WebSocketClientHandshaker handshaker) { this.handshaker = handshaker; } public ChannelFuture handshakeFuture() { return handshakeFuture; } @Override public void handlerAdded(ChannelHandlerContext ctx) { handshakeFuture = ctx.newPromise(); } @Override public void channelActive(ChannelHandlerContext ctx) { handshaker.handshake(ctx.channel()); } @Override public void channelInactive(ChannelHandlerContext ctx) { System.out.println("WebSocket Client disconnected!"); } @Override public void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception { Channel ch = ctx.channel(); if (!handshaker.isHandshakeComplete()) { handshaker.finishHandshake(ch, (FullHttpResponse) msg); System.out.println("WebSocket Client connected!"); handshakeFuture.setSuccess(); return; } if (msg instanceof FullHttpResponse) { FullHttpResponse response = (FullHttpResponse) msg; throw new IllegalStateException("Unexpected FullHttpResponse (getStatus=" + response.getStatus() + ", content=" + response.content().toString(CharsetUtil.UTF_8) + ')'); } WebSocketFrame frame = (WebSocketFrame) msg; if (frame instanceof TextWebSocketFrame) { TextWebSocketFrame textFrame = (TextWebSocketFrame) frame; System.out.println("WebSocket Client received message: " + textFrame.text()); } else if (frame instanceof PongWebSocketFrame) { System.out.println("WebSocket Client received pong"); } else if (frame instanceof CloseWebSocketFrame) { System.out.println("WebSocket Client received closing"); ch.close(); } } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { cause.printStackTrace(); if (!handshakeFuture.isDone()) { handshakeFuture.setFailure(cause); } ctx.close(); } }