private BackClientPool() {
    bootstrap
            .group(group)
            .option(ChannelOption.CONNECT_TIMEOUT_MILLIS, 500)
            .channel(NioSocketChannel.class)
            .option(ChannelOption.TCP_NODELAY, true)
            .option(ChannelOption.SO_KEEPALIVE, true);

    poolMap = new AbstractChannelPoolMap<RequestHolder, SimpleChannelPool>() {
        @Override
        protected SimpleChannelPool newPool(RequestHolder requestHolder) {
            return new FixedChannelPool(bootstrap.remoteAddress(requestHolder.getSocketAddress()), new BackPoolHandler(requestHolder), 50);
        }
    };
}
 

public static void main(String[] args) {
		EventLoopGroup group = new NioEventLoopGroup();
		final Bootstrap cb = new Bootstrap();
		cb.group(group).channel(NioSocketChannel.class);
		InetSocketAddress addr1 = new InetSocketAddress("10.0.0.10", 8888);
		InetSocketAddress addr2 = new InetSocketAddress("10.0.0.11", 8888);

		//连接池map
		ChannelPoolMap<InetSocketAddress, SimpleChannelPool> poolMap = new AbstractChannelPoolMap<InetSocketAddress, SimpleChannelPool>() {
		    @Override
		    protected SimpleChannelPool newPool(InetSocketAddress key) {
		        return new SimpleChannelPool(cb.remoteAddress(key), new TestChannelPoolHandler());
		    }
		};

		final SimpleChannelPool pool1 = poolMap.get(addr1);//取出連接addr1地址的连接池
		final SimpleChannelPool pool2 = poolMap.get(addr2);//取出連接addr2地址的连接池
		Future<Channel> f1 = pool1.acquire();//获取一个连接
		f1.addListener(new FutureListener<Channel>() {
		    @Override
		    public void operationComplete(Future<Channel> f) {
		        if (f.isSuccess()) {
		            Channel ch = f.getNow();
		           //连接地址1的某个channel
		            //使用连接发送消息
//		            ch.write(msg)
		            //用完释放
		            pool1.release(ch);
		        }
		    }
		});

	}