Mon, 01 Jan 0001 00:00:00 +0000
Netty编码流程 #

写一个简单的http server
public class TestServer {
 public static void main(String[] args) {
 EventLoopGroup bossGroup = new NioEventLoopGroup();
 EventLoopGroup wordGroup = new NioEventLoopGroup();

 ServerBootstrap serverBootstrap = new ServerBootstrap();

 try {
 serverBootstrap.group(bossGroup,wordGroup)
 .channel(NioServerSocketChannel.class)
 
 // channel初始化器
 .childHandler(new ChannelInitializer<SocketChannel>() {
 @Override
 protected void initChannel(SocketChannel socketChannel) throws Exception {
 ChannelPipeline pipeline = socketChannel.pipeline();
 pipeline.addLast("httpServerCodec",new HttpServerCodec());
 
 // 在pipeline中加入自定义的解码器 handler
 pipeline.addLast("httpServerContent", new SimpleChannelInboundHandler<HttpObject>() {
 @Override
 protected void channelRead0(ChannelHandlerContext channelHandlerContext, HttpObject msg) throws Exception {
 /* 
 另外有一个 LastHttpContent 类型的 EMPTY_LAST_CONTENT 对象
 来源：HttpServerCodec 中 inboundHandler 为 HttpServerRequestDecoder ==> HttpObjectDecoder
 channelRead 的时候会进行解码，追加两个对象；
 out.add(message);
 out.add(LastHttpContent.EMPTY_LAST_CONTENT);
 所以追加if判断
 */
 if(msg instanceof HttpRequest){
 ByteBuf byteBuf = Unpooled.copiedBuffer("hello world", CharsetUtil.UTF_8);
 FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1,HttpResponseStatus.OK,byteBuf);
 response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain");
 response.headers().set(HttpHeaderNames.CONTENT_LENGTH,byteBuf.readableBytes());
 response.headers().set(HttpHeaderNames.SERVER,"X-eli");

 channelHandlerContext.writeAndFlush(response);
 }
 }
 });
 }
 });
 ChannelFuture channelFuture = serverBootstrap.bind(13308).sync();
 channelFuture.channel().closeFuture().sync();
 }catch (Exception e){
 e.printStackTrace();
 }finally {
 bossGroup.shutdownGracefully();
 wordGroup.shutdownGracefully();
 }
 }
}
Reference #

https://www.bilibili.com/video/BV1c4411J7Ty?p=5
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Netty编码流程 #

Reference #
