Java tutorial
/** The MIT License (MIT) Copyright (c) <2015> <author or authors> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ package com.zhucode.longio.transport.netty; import java.net.URI; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.zhucode.longio.exception.ProtocolException; import com.zhucode.longio.message.MessageBlock; import com.zhucode.longio.protocol.Protocol; import com.zhucode.longio.transport.Client; import com.zhucode.longio.transport.Connector; import com.zhucode.longio.transport.netty.event.PingEvent; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.Channel; import io.netty.channel.ChannelFuture; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelPromise; import io.netty.handler.codec.http.DefaultFullHttpRequest; import io.netty.handler.codec.http.FullHttpResponse; import io.netty.handler.codec.http.HttpHeaders; import io.netty.handler.codec.http.HttpMethod; import io.netty.handler.codec.http.HttpVersion; 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; import io.netty.util.ReferenceCountUtil; /** * @author zhu jinxian * @date 20151012 * */ public class HttpClientHandler extends AbstractClientHandler { Logger logger = LoggerFactory.getLogger(HttpClientHandler.class); private WebSocketClientHandshaker handshaker; private ChannelPromise handshakeFuture; private URI uri; public HttpClientHandler(Client client, Connector connector, Protocol pp, URI uri, WebSocketClientHandshaker handshaker) { super(client, connector, pp); this.handshaker = handshaker; this.uri = uri; } @Override public void channelRegistered(ChannelHandlerContext ctx) throws Exception { super.channelRegistered(ctx); ctx.attr(handlerKey).set(this); this.sessionId = this.getNettyConnector().registHandlerContext(ctx); } @Override public void handlerAdded(ChannelHandlerContext ctx) throws Exception { super.handlerAdded(ctx); if (handshaker != null) { handshakeFuture = ctx.newPromise(); } } @Override public void channelActive(ChannelHandlerContext ctx) throws Exception { //super.channelActive(ctx); if (handshaker != null) { handshaker.handshake(ctx.channel()); } else { } } @Override public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception { try { if (handshaker == null) { handleHttp(ctx, msg); } else { handleWebsocket(ctx, msg); } } finally { ReferenceCountUtil.release(msg); } } private void handleWebsocket(ChannelHandlerContext ctx, Object msg) { 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; } 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(); } } private void handleHttp(ChannelHandlerContext ctx, Object msg) { FullHttpResponse res = (FullHttpResponse) msg; ByteBuf bb = res.content(); byte[] bytes = new byte[bb.readableBytes()]; bb.readBytes(bytes); try { MessageBlock mb = pp.decode(bytes); if (mb.getCmd() == 0) { ctx.fireUserEventTriggered(new PingEvent()); return; } processRevMessage(ctx, mb); } catch (ProtocolException e) { e.printStackTrace(); } } @Override public ChannelFuture sendMessage(ChannelHandlerContext ctx, MessageBlock mb) { byte[] bytes = null; try { bytes = pp.encode(mb); } catch (ProtocolException e) { e.printStackTrace(); } if (handshaker != null) { return sendForWebSocket(ctx, bytes); } else { return sendForHttp(ctx, bytes); } } private ChannelFuture sendForHttp(ChannelHandlerContext ctx, byte[] bytes) { DefaultFullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.POST, uri.toASCIIString(), Unpooled.wrappedBuffer(bytes)); // http request.headers().set(HttpHeaders.Names.HOST, uri.getHost()); request.headers().set(HttpHeaders.Names.CONNECTION, HttpHeaders.Values.KEEP_ALIVE); request.headers().set(HttpHeaders.Names.CONTENT_LENGTH, request.content().readableBytes()); return ctx.writeAndFlush(request); } private ChannelFuture sendForWebSocket(ChannelHandlerContext ctx, byte[] bytes) { TextWebSocketFrame frame = new TextWebSocketFrame(); frame.content().writeBytes(bytes); return ctx.channel().writeAndFlush(frame); } }