HeartBeatsClient.java

package com.lyncc.netty.heartbeats;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.handler.logging.LogLevel;
import io.netty.handler.logging.LoggingHandler;
import io.netty.handler.timeout.IdleStateHandler;

import java.util.concurrent.TimeUnit;

public class HeartBeatsClient {

    public void connect(int port, String host) throws Exception {
        
        
     // Configure the client.
        EventLoopGroup group = new NioEventLoopGroup();
        ChannelFuture future = null;
        try {
            Bootstrap b = new Bootstrap();
            b.group(group)
             .channel(NioSocketChannel.class)
             .option(ChannelOption.TCP_NODELAY, true)
             .handler(new LoggingHandler(LogLevel.INFO))
             .handler(new ChannelInitializer<SocketChannel>() {
                 @Override
                 public void initChannel(SocketChannel ch) throws Exception {
                     ChannelPipeline p = ch.pipeline();
                     p.addLast("ping", new IdleStateHandler(0, 4, 0, TimeUnit.SECONDS));
                     p.addLast("decoder", new StringDecoder());
                     p.addLast("encoder", new StringEncoder());
                     p.addLast(new HeartBeatClientHandler());
                 }
             });

            future = b.connect(host, port).sync();
            future.channel().closeFuture().sync();
        } finally {
//          group.shutdownGracefully();
          if (null != future) {
              if (future.channel() != null && future.channel().isOpen()) {
                  future.channel().close();
              }
          }
          System.out.println("准备重连");
          connect(port, host);
          System.out.println("重连成功");
        }
    }

    /**
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        int port = 8080;
        if (args != null && args.length > 0) {
            try {
                port = Integer.valueOf(args[0]);
            } catch (NumberFormatException e) {
                // 采用默认值
            }
        }
        new HeartBeatsClient().connect(port, "127.0.0.1");
    }

}