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1   /*
2    * Copyright 2012 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package org.jboss.netty.example.http.helloworld;
17  
18  import org.jboss.netty.buffer.ChannelBuffers;
19  import org.jboss.netty.channel.Channel;
20  import org.jboss.netty.channel.ChannelFuture;
21  import org.jboss.netty.channel.ChannelFutureListener;
22  import org.jboss.netty.channel.ChannelHandlerContext;
23  import org.jboss.netty.channel.Channels;
24  import org.jboss.netty.channel.ExceptionEvent;
25  import org.jboss.netty.channel.MessageEvent;
26  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
27  import org.jboss.netty.handler.codec.http.DefaultHttpResponse;
28  import org.jboss.netty.handler.codec.http.HttpRequest;
29  import org.jboss.netty.handler.codec.http.HttpResponse;
30  
31  import static org.jboss.netty.handler.codec.http.HttpHeaders.Names.*;
32  import static org.jboss.netty.handler.codec.http.HttpHeaders.*;
33  import static org.jboss.netty.handler.codec.http.HttpResponseStatus.*;
34  import static org.jboss.netty.handler.codec.http.HttpVersion.*;
35  
36  public class HttpHelloWorldServerHandler extends SimpleChannelUpstreamHandler {
37  
38      private static final byte[] CONTENT = { 'H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd' };
39  
40      @Override
41      public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
42          Object msg = e.getMessage();
43          Channel ch = e.getChannel();
44          if (msg instanceof HttpRequest) {
45              HttpRequest req = (HttpRequest) msg;
46  
47              if (is100ContinueExpected(req)) {
48                  Channels.write(ctx, Channels.future(ch), new DefaultHttpResponse(HTTP_1_1, CONTINUE));
49              }
50  
51              boolean keepAlive = isKeepAlive(req);
52              HttpResponse response = new DefaultHttpResponse(HTTP_1_1, OK);
53              response.setContent(ChannelBuffers.wrappedBuffer(CONTENT));
54              response.headers().set(CONTENT_TYPE, "text/plain");
55              response.headers().set(CONTENT_LENGTH, response.getContent().readableBytes());
56  
57              if (!keepAlive) {
58                  ChannelFuture f = Channels.future(ch);
59                  f.addListener(ChannelFutureListener.CLOSE);
60                  Channels.write(ctx, f, response);
61              } else {
62                  response.headers().set(CONNECTION, Values.KEEP_ALIVE);
63                  Channels.write(ctx, Channels.future(ch), response);
64              }
65          }
66      }
67  
68      @Override
69      public void exceptionCaught(ChannelHandlerContext ctx, ExceptionEvent e) {
70          e.getCause().printStackTrace();
71          e.getChannel().close();
72      }
73  }