b57d9f307f
- write() now accepts a ChannelPromise and returns ChannelFuture as most users expected. It makes the user's life much easier because it is now much easier to get notified when a specific message has been written. - flush() does not create a ChannelPromise nor returns ChannelFuture. It is now similar to what read() looks like.
97 lines
3.0 KiB
Java
97 lines
3.0 KiB
Java
/*
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* Copyright 2012 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.example.telnet;
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import io.netty.bootstrap.Bootstrap;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.EventLoopGroup;
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import io.netty.channel.nio.NioEventLoopGroup;
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import io.netty.channel.socket.nio.NioSocketChannel;
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import java.io.BufferedReader;
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import java.io.InputStreamReader;
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/**
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* Simplistic telnet client.
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*/
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public class TelnetClient {
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private final String host;
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private final int port;
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public TelnetClient(String host, int port) {
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this.host = host;
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this.port = port;
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}
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public void run() throws Exception {
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EventLoopGroup group = new NioEventLoopGroup();
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try {
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Bootstrap b = new Bootstrap();
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b.group(group)
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.channel(NioSocketChannel.class)
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.handler(new TelnetClientInitializer());
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// Start the connection attempt.
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Channel ch = b.connect(host, port).sync().channel();
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// Read commands from the stdin.
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ChannelFuture lastWriteFuture = null;
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BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
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for (;;) {
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String line = in.readLine();
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if (line == null) {
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break;
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}
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// Sends the received line to the server.
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lastWriteFuture = ch.writeAndFlush(line + "\r\n");
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// If user typed the 'bye' command, wait until the server closes
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// the connection.
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if ("bye".equals(line.toLowerCase())) {
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ch.closeFuture().sync();
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break;
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}
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}
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// Wait until all messages are flushed before closing the channel.
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if (lastWriteFuture != null) {
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lastWriteFuture.sync();
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}
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} finally {
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group.shutdownGracefully();
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}
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}
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public static void main(String[] args) throws Exception {
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// Print usage if no argument is specified.
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if (args.length != 2) {
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System.err.println(
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"Usage: " + TelnetClient.class.getSimpleName() +
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" <host> <port>");
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return;
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}
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// Parse options.
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String host = args[0];
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int port = Integer.parseInt(args[1]);
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new TelnetClient(host, port).run();
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}
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}
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