查看本类的 API文档回源码主页

   /*
    * 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:
    *
    *   https://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.localecho;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.bootstrap.ServerBootstrap;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.DefaultEventLoopGroup;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.local.LocalAddress;
  import io.netty.channel.local.LocalChannel;
  import io.netty.channel.local.LocalServerChannel;
  import io.netty.channel.nio.NioEventLoopGroup;
  import io.netty.handler.logging.LogLevel;
  import io.netty.handler.logging.LoggingHandler;
  
  import java.io.BufferedReader;
  import java.io.InputStreamReader;
  
  public final class LocalEcho {
  
      static final String PORT = System.getProperty("port", "test_port");
  
      public static void main(String[] args) throws Exception {
          // Address to bind on / connect to.
          final LocalAddress addr = new LocalAddress(PORT);
  
          EventLoopGroup serverGroup = new DefaultEventLoopGroup();
          EventLoopGroup clientGroup = new NioEventLoopGroup(); // NIO event loops are also OK
          try {
              // Note that we can use any event loop to ensure certain local channels
              // are handled by the same event loop thread which drives a certain socket channel
              // to reduce the communication latency between socket channels and local channels.
              ServerBootstrap sb = new ServerBootstrap();
              sb.group(serverGroup)
                .channel(LocalServerChannel.class)
                .handler(new ChannelInitializer<LocalServerChannel>() {
                    @Override
                    public void initChannel(LocalServerChannel ch) throws Exception {
                        ch.pipeline().addLast(new LoggingHandler(LogLevel.INFO));
                    }
                })
                .childHandler(new ChannelInitializer<LocalChannel>() {
                    @Override
                    public void initChannel(LocalChannel ch) throws Exception {
                        ch.pipeline().addLast(
                                new LoggingHandler(LogLevel.INFO),
                                new LocalEchoServerHandler());
                    }
                });
  
              Bootstrap cb = new Bootstrap();
              cb.group(clientGroup)
                .channel(LocalChannel.class)
                .handler(new ChannelInitializer<LocalChannel>() {
                    @Override
                    public void initChannel(LocalChannel ch) throws Exception {
                        ch.pipeline().addLast(
                                new LoggingHandler(LogLevel.INFO),
                                new LocalEchoClientHandler());
                    }
                });
  
              // Start the server.
              sb.bind(addr).sync();
  
              // Start the client.
              Channel ch = cb.connect(addr).sync().channel();
  
              // Read commands from the stdin.
              System.out.println("Enter text (quit to end)");
              ChannelFuture lastWriteFuture = null;
              BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
              for (;;) {
                  String line = in.readLine();
                  if (line == null || "quit".equalsIgnoreCase(line)) {
                      break;
                  }
  
                  // Sends the received line to the server.
                  lastWriteFuture = ch.writeAndFlush(line);
              }
  
              // Wait until all messages are flushed before closing the channel.
             if (lastWriteFuture != null) {
                 lastWriteFuture.awaitUninterruptibly();
             }
         } finally {
             serverGroup.shutdownGracefully();
             clientGroup.shutdownGracefully();
         }
     }
 }