在android中使用netty框架通信

    最近在做一个项目，基于android版本的一个物联网应用，涉及到了关于socket通信方面的内容，在google上搜了一下，发现Netty框架可以快速的实现socket通信。而且使用起来十分方便。

1.建立socket连接

public class CmdClient {
	private ClientBootstrap bootstrap;
	private ChannelFuture channelFuture;
	private Channel channel;
	private static final CmdClient client = new CmdClient(); //单例实现，用来取channel
	private CmdClient(){
		
	}
	
	public static CmdClient getInstance(){
		return client;
	}
	
	public Channel getChannel() {
		return channel;
	}

	public void setChannel(Channel channel) {
		this.channel = channel;
	}

	public ClientBootstrap getBootstrap() {
		return bootstrap;
	}

	public void setBootstrap(ClientBootstrap bootstrap) {
		this.bootstrap = bootstrap;
	}

	public ChannelFuture getChannelFuture() {
		return channelFuture;
	}

	public void setChannelFuture(ChannelFuture channelFuture) {
		this.channelFuture = channelFuture;
	}

	public int start(String ip,int port) {
		System.setProperty("java.net.preferIPv4Stack", "true");
		System.setProperty("java.net.preferIPv6Addresses", "false");
		bootstrap = new ClientBootstrap(new NioClientSocketChannelFactory(
				Executors.newCachedThreadPool(),
				Executors.newCachedThreadPool()));
		bootstrap.setPipelineFactory(new CmdPipelineFactory());
		bootstrap.setOption("tcpNoDelay", true);
		bootstrap.setOption("keepAlive", true);
		channelFuture = bootstrap.connect(new InetSocketAddress(ip, port));
		channelFuture.awaitUninterruptibly();
		channel = channelFuture.awaitUninterruptibly().getChannel();
		return 1;
	}

	public void stop() {
		channelFuture.awaitUninterruptibly();
		if (!channelFuture.isSuccess()) {
			channelFuture.getCause().printStackTrace();
		}
		channelFuture.getChannel().getCloseFuture().awaitUninterruptibly();
		bootstrap.releaseExternalResources();
	}

 2.CmdPipelineFactory代码

public class CmdPipelineFactory implements ChannelPipelineFactory {
	@Override
	public ChannelPipeline getPipeline() throws Exception {
		ChannelPipeline pipeline = Channels.pipeline();
		pipeline.addLast("cmdDecoder", new CmdDecoder());
		pipeline.addLast("handler", new CmdClientHandler());
		return pipeline;
	}
	
}

 3.netty使用的是filter方式实现packet解析，这边我加入了一个CmdDecoder用来解析协议包头

public class CmdDecoder extends FrameDecoder {

    @Override
    protected Object decode(ChannelHandlerContext ctx, Channel channel,
            ChannelBuffer buffer) throws Exception {
        if (buffer.readableBytes() < 1) {
            return null;
        }
        buffer.markReaderIndex();
        ChannelBuffer magicBuff = buffer.readBytes(1);
        int magic = DataConvert.byteArrayToSignedInt(magicBuff
                .array());
        if (magic == 0x77) {
            if (buffer.readableBytes() < 19) {
                return null;
            }
            buffer.markReaderIndex();
            ChannelBuffer lenBuff = buffer.readBytes(19);
            PacketParse parse = new PacketParse(null);
            byte[] lenByte = parse.getPackForTwoByte(lenBuff.array(), 17, 2);
            int len = DataConvert.byteArrayToSignedInt(lenByte);
            if (buffer.readableBytes() < len) {
                buffer.resetReaderIndex();
                return null;
            }
            ChannelBuffer frame = buffer.readBytes(len);
            return frame;
        }
        buffer.clear();
        return null;
    }

这个需要根据自己所定义的协议来处理

评论

1 楼 maotou1988 2016-05-18  

android基于netty的发送图片与文字demo，楼主共勉
http://lison.cc/508.html