View Javadoc
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.telnet;
17  
18  import org.jboss.netty.bootstrap.ClientBootstrap;
19  import org.jboss.netty.channel.Channel;
20  import org.jboss.netty.channel.ChannelFuture;
21  import org.jboss.netty.channel.socket.nio.NioClientSocketChannelFactory;
22  import org.jboss.netty.handler.ssl.SslContext;
23  import org.jboss.netty.handler.ssl.util.InsecureTrustManagerFactory;
24  
25  import java.io.BufferedReader;
26  import java.io.InputStreamReader;
27  import java.net.InetSocketAddress;
28  import java.util.concurrent.Executors;
29  
30  /**
31   * Simplistic telnet client.
32   */
33  public final class TelnetClient {
34  
35      static final boolean SSL = System.getProperty("ssl") != null;
36      static final String HOST = System.getProperty("host", "127.0.0.1");
37      static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8992" : "8023"));
38  
39      public static void main(String[] args) throws Exception {
40          // Configure SSL.
41          final SslContext sslCtx;
42          if (SSL) {
43              sslCtx = SslContext.newClientContext(InsecureTrustManagerFactory.INSTANCE);
44          } else {
45              sslCtx = null;
46          }
47  
48          // Configure the client.
49          ClientBootstrap bootstrap = new ClientBootstrap(
50                  new NioClientSocketChannelFactory(
51                          Executors.newCachedThreadPool(),
52                          Executors.newCachedThreadPool()));
53  
54          try {
55              // Configure the pipeline factory.
56              bootstrap.setPipelineFactory(new TelnetClientPipelineFactory(sslCtx));
57  
58              // Start the connection attempt.
59              ChannelFuture future = bootstrap.connect(new InetSocketAddress(HOST, PORT));
60  
61              // Wait until the connection attempt succeeds or fails.
62              Channel channel = future.sync().getChannel();
63  
64              // Read commands from the stdin.
65              ChannelFuture lastWriteFuture = null;
66              BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
67              for (;;) {
68                  String line = in.readLine();
69                  if (line == null) {
70                      break;
71                  }
72  
73                  // Sends the received line to the server.
74                  lastWriteFuture = channel.write(line + "\r\n");
75  
76                  // If user typed the 'bye' command, wait until the server closes
77                  // the connection.
78                  if ("bye".equals(line.toLowerCase())) {
79                      channel.getCloseFuture().sync();
80                      break;
81                  }
82              }
83  
84              // Wait until all messages are flushed before closing the channel.
85              if (lastWriteFuture != null) {
86                  lastWriteFuture.sync();
87              }
88  
89              // Close the connection.  Make sure the close operation ends because
90              // all I/O operations are asynchronous in Netty.
91              channel.close().sync();
92          } finally {
93              // Shut down all thread pools to exit.
94              bootstrap.releaseExternalResources();
95          }
96      }
97  }