Java tutorial
/* * Copyright 2012 The Netty Project * * The Netty Project licenses this file to you under the Apache License, * version 2.0 (the "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. */ package books.netty.ssl; import io.netty.channel.Channel; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.channel.group.ChannelGroup; import io.netty.channel.group.DefaultChannelGroup; import io.netty.handler.ssl.SslHandler; import io.netty.util.concurrent.Future; import io.netty.util.concurrent.GenericFutureListener; import io.netty.util.concurrent.GlobalEventExecutor; import java.net.InetAddress; import java.util.logging.Level; import java.util.logging.Logger; /** * Handles a server-side channel. */ public class SecureChatServerHandler extends SimpleChannelInboundHandler<String> { private static final Logger logger = Logger.getLogger(SecureChatServerHandler.class.getName()); static final ChannelGroup channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE); @Override public void channelActive(final ChannelHandlerContext ctx) { // Once session is secured, send a greeting and register the channel to // the global channel // list so the channel received the messages from others. ctx.pipeline().get(SslHandler.class).handshakeFuture() .addListener(new GenericFutureListener<Future<Channel>>() { @Override public void operationComplete(Future<Channel> future) throws Exception { ctx.writeAndFlush("Welcome to " + InetAddress.getLocalHost().getHostName() + " secure chat service!\n"); ctx.writeAndFlush("Your session is protected by " + ctx.pipeline().get(SslHandler.class).engine().getSession().getCipherSuite() + " cipher suite.\n"); channels.add(ctx.channel()); } }); } // @Override public void messageReceived(ChannelHandlerContext ctx, String msg) { // Send the received message to all channels but the current one. for (Channel c : channels) { if (c != ctx.channel()) { c.writeAndFlush("[" + ctx.channel().remoteAddress() + "] " + msg + '\n'); } else { c.writeAndFlush("[you] " + msg + '\n'); } } // Close the connection if the client has sent 'bye'. if ("bye".equals(msg.toLowerCase())) { ctx.close(); } } @Override public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) { cause.printStackTrace(); logger.log(Level.WARNING, "Unexpected exception from downstream.", cause); ctx.close(); } @Override protected void channelRead0(ChannelHandlerContext ctx, String msg) { // todo } }