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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    *   https://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 io.netty.example.file;
17  
18  import io.netty.bootstrap.ServerBootstrap;
19  import io.netty.channel.ChannelFuture;
20  import io.netty.channel.ChannelInitializer;
21  import io.netty.channel.ChannelOption;
22  import io.netty.channel.ChannelPipeline;
23  import io.netty.channel.EventLoopGroup;
24  import io.netty.channel.MultiThreadIoEventLoopGroup;
25  import io.netty.channel.nio.NioIoHandler;
26  import io.netty.channel.socket.SocketChannel;
27  import io.netty.channel.socket.nio.NioServerSocketChannel;
28  import io.netty.example.util.ServerUtil;
29  import io.netty.handler.codec.LineBasedFrameDecoder;
30  import io.netty.handler.codec.string.StringDecoder;
31  import io.netty.handler.codec.string.StringEncoder;
32  import io.netty.handler.logging.LogLevel;
33  import io.netty.handler.logging.LoggingHandler;
34  import io.netty.handler.ssl.SslContext;
35  import io.netty.handler.stream.ChunkedWriteHandler;
36  import io.netty.util.CharsetUtil;
37  
38  /**
39   * Server that accept the path of a file an echo back its content.
40   */
41  public final class FileServer {
42  
43      static final boolean SSL = System.getProperty("ssl") != null;
44      // Use the same default port with the telnet example so that we can use the telnet client example to access it.
45      static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8992" : "8023"));
46  
47      public static void main(String[] args) throws Exception {
48          // Configure SSL.
49          final SslContext sslCtx = ServerUtil.buildSslContext();
50  
51          // Configure the server.
52          EventLoopGroup bossGroup = new MultiThreadIoEventLoopGroup(1, NioIoHandler.newFactory());
53          EventLoopGroup workerGroup = new MultiThreadIoEventLoopGroup(1, NioIoHandler.newFactory());
54          try {
55              ServerBootstrap b = new ServerBootstrap();
56              b.group(bossGroup, workerGroup)
57               .channel(NioServerSocketChannel.class)
58               .option(ChannelOption.SO_BACKLOG, 100)
59               .handler(new LoggingHandler(LogLevel.INFO))
60               .childHandler(new ChannelInitializer<SocketChannel>() {
61                   @Override
62                   public void initChannel(SocketChannel ch) throws Exception {
63                       ChannelPipeline p = ch.pipeline();
64                       if (sslCtx != null) {
65                           p.addLast(sslCtx.newHandler(ch.alloc()));
66                       }
67                       p.addLast(
68                               new StringEncoder(CharsetUtil.UTF_8),
69                               new LineBasedFrameDecoder(8192),
70                               new StringDecoder(CharsetUtil.UTF_8),
71                               new ChunkedWriteHandler(),
72                               new FileServerHandler());
73                   }
74               });
75  
76              // Start the server.
77              ChannelFuture f = b.bind(PORT).sync();
78  
79              // Wait until the server socket is closed.
80              f.channel().closeFuture().sync();
81          } finally {
82              // Shut down all event loops to terminate all threads.
83              bossGroup.shutdownGracefully();
84              workerGroup.shutdownGracefully();
85          }
86      }
87  }