/*
* 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 io.netty.example.telnet;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioSocketChannel;
import java.io.BufferedReader;
import java.io.InputStreamReader;
/**
* Simplistic telnet client.
*/
public class TelnetClient {
private final String host;
private final int port;
public TelnetClient(String host, int port) {
this.host = host;
this.port = port;
}
public void run() throws Exception {
Bootstrap b = new Bootstrap();
try {
b.group(new NioEventLoopGroup())
.channel(NioSocketChannel.class)
.handler(new TelnetClientInitializer());
// Start the connection attempt.
Channel ch = b.connect(host, port).sync().channel();
// Read commands from the stdin.
ChannelFuture lastWriteFuture = null;
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
for (;;) {
String line = in.readLine();
if (line == null) {
break;
}
// Sends the received line to the server.
lastWriteFuture = ch.write(line + "\r\n");
// If user typed the 'bye' command, wait until the server closes
// the connection.
if ("bye".equals(line.toLowerCase())) {
ch.closeFuture().sync();
break;
}
}
// Wait until all messages are flushed before closing the channel.
if (lastWriteFuture != null) {
lastWriteFuture.sync();
}
} finally {
b.shutdown();
}
}
public static void main(String[] args) throws Exception {
// Print usage if no argument is specified.
if (args.length != 2) {
System.err.println(
"Usage: " + TelnetClient.class.getSimpleName() +
" <host> <port>");
return;
}
// Parse options.
String host = args[0];
int port = Integer.parseInt(args[1]);
new TelnetClient(host, port).run();
}
}