Netty 基于Http协议下的数据传输示例
Http/Https协议是最重要最常用到的协议之一,Netty提供了一些了的Handler来处理Http协议下的编码工作。下面就介绍一个Netty实例:
1.通过HttpClient发送Protobuf类型数据到服务端
2.服务端Netty负责把接收到的Http请求中的数据再发送到客户端。
3.其中Netty对发送的数据量没有限制,因为Http发送的message往往是由一系列infragment构成,Netty可以把接收到的http请求片段信息整合(Aggregator)到一起,最终得到一个FullHttpRequest。
Client端:
服务器端NettyService:
package NettyDemo.echo.server; import io.netty.bootstrap.ServerBootstrap; import io.netty.channel.ChannelInitializer; 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.NioServerSocketChannel; import io.netty.handler.codec.http.HttpObjectAggregator; import io.netty.handler.codec.http.HttpRequestDecoder; import io.netty.handler.codec.http.HttpResponseEncoder; import io.netty.handler.codec.http.HttpServerCodec; import NettyDemo.echo.handler.HttpProtobufServerHandler; public class HttpProtobufServer { public static final String IP = "127.0.0.1"; public static final int PORT = 8080; //private static MessageLite lite=AddressBookProtos.AddressBook.getDefaultInstance(); /**用于分配处理业务线程的线程组个数 */ protected static final int BIZGROUPSIZE = Runtime.getRuntime().availableProcessors()*2; //默认 /** 业务出现线程大小*/ protected static final int BIZTHREADSIZE = 4; private static final EventLoopGroup bossGroup = new NioEventLoopGroup(BIZGROUPSIZE); private static final EventLoopGroup workerGroup = new NioEventLoopGroup(BIZTHREADSIZE); protected static void run() throws Exception { ServerBootstrap b = new ServerBootstrap(); b.group(bossGroup, workerGroup); b.channel(NioServerSocketChannel.class); b.childHandler(new ChannelInitializer<SocketChannel>() { @Override public void initChannel(SocketChannel ch) throws Exception { ChannelPipeline pipeline = ch.pipeline(); pipeline.addLast("decoder", new HttpRequestDecoder()); /**usually we receive http message infragment,if we want full http message, * we should bundle HttpObjectAggregator and we can get FullHttpRequest。 * 我们通常接收到的是一个http片段,如果要想完整接受一次请求的所有数据,我们需要绑定HttpObjectAggregator,然后我们 * 就可以收到一个FullHttpRequest-是一个完整的请求信息。 **/ pipeline.addLast("servercodec",new HttpServerCodec()); pipeline.addLast("aggegator",new HttpObjectAggregator(1024*1024*64));//定义缓冲数据量 pipeline.addLast(new HttpProtobufServerHandler()); pipeline.addLast("responseencoder",new HttpResponseEncoder()); } }); b.bind(IP, PORT).sync(); System.out.println("TCP服务器已启动"); } protected static void shutdown() { workerGroup.shutdownGracefully(); bossGroup.shutdownGracefully(); } public static void main(String[] args) throws Exception { System.out.println("开始启动http服务器..."); HttpProtobufServer.run(); // TcpServer.shutdown(); } }
Handler:
package NettyDemo.echo.handler; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.SimpleChannelInboundHandler; import io.netty.handler.codec.http.DefaultFullHttpRequest; import io.netty.handler.codec.http.DefaultFullHttpResponse; import io.netty.handler.codec.http.HttpResponseStatus; import io.netty.handler.codec.http.HttpVersion; public class HttpProtobufServerHandler extends SimpleChannelInboundHandler<Object>{ @Override protected void channelRead0(ChannelHandlerContext ctx, Object msg) throws Exception { DefaultFullHttpRequest request=(DefaultFullHttpRequest)msg; DefaultFullHttpResponse response=new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.ACCEPTED, request.content()); ctx.writeAndFlush(response); } }
附:FullHttpRequest构成,因此一个FullHttpRequest会包含请求message的所有片段。
来自:http://blog.csdn.net/suifeng3051/article/details/22800171
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