netty http server入门练习

使用netty写一个简单的http server

package org.game.throne.proxy;import io.netty.bootstrap.ServerBootstrap;import io.netty.buffer.ByteBuf;import io.netty.buffer.ByteBufProcessor;import io.netty.buffer.Unpooled;import io.netty.channel.*;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.*;import io.netty.util.CharsetUtil;import java.util.ArrayList;import java.util.List;/** * Created by lvtu on 2017/8/31. */class MServerHandler extends ChannelInboundHandlerAdapter {    private StringBuilder body = new StringBuilder();    private List<Byte> bb = new ArrayList<>();    @Override    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {        if(msg instanceof DefaultHttpContent){            DefaultHttpContent httpContent  = (DefaultHttpContent)msg;            ByteBuf content = httpContent.content();            content.forEachByte(new ByteBufProcessor(){                @Override                public boolean process(byte value) throws Exception {                    bb.add(value);                    return true;                }            });            body.append(content.toString());        }        if(msg instanceof DefaultLastHttpContent){            byte[] b = new byte[bb.size()];            for(int i=0;i<bb.size();i++){                b[i] = bb.get(i);            }            System.out.println(new String(b,"utf-8"));            ctx.flush();        }        if (msg instanceof HttpRequest) {            ByteBuf content = Unpooled.copiedBuffer("Hello World.", CharsetUtil.UTF_8);            FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);            response.headers().set(HttpHeaders.Names.CONTENT_TYPE, "text/plain");//必须加这个，否则浏览器不响应            response.headers().set(HttpHeaders.Names.CONTENT_LENGTH, content.readableBytes());//必须加这个，否则浏览器不响应            response.headers().set(HttpHeaders.Names.CONNECTION, "keep-alive");            ctx.write(response);        }    }    @Override    public void channelReadComplete(ChannelHandlerContext ctx) {        ctx.flush();    }}public class MServer {    private int port;    public MServer(int port) {        this.port = port;    }    public void run() throws Exception {        EventLoopGroup bossGroup = new NioEventLoopGroup(); // (1)        EventLoopGroup workerGroup = new NioEventLoopGroup();        try {            ServerBootstrap b = new ServerBootstrap(); // (2)            b.group(bossGroup, workerGroup)                    .channel(NioServerSocketChannel.class) // (3)                    .childHandler(new ChannelInitializer<SocketChannel>() { // (4)                        @Override                        public void initChannel(SocketChannel ch) throws Exception {                            ChannelPipeline pipeline = ch.pipeline();                            pipeline.addLast(new HttpServerCodec());                            pipeline.addLast(new MServerHandler());                        }                    })                    .option(ChannelOption.SO_BACKLOG, 128)          // (5)                    .childOption(ChannelOption.SO_KEEPALIVE, true); // (6)            // Bind and start to accept incoming connections.            ChannelFuture f = b.bind(port).sync(); // (7)            // Wait until the server socket is closed.            // In this example, this does not happen, but you can do that to gracefully            // shut down your server.            f.channel().closeFuture().sync();        } finally {            workerGroup.shutdownGracefully();            bossGroup.shutdownGracefully();        }    }    public static void main(String[] args) {        try {            new MServer(8082).run();        }catch (Exception e){            e.printStackTrace();        }    }}

问题点

1.netty通过文档或者看源码，都可以达到简单使用

2.最大的问题点是上面代码标注红色的地方，如果没有正确设定http response，浏览器是不会相应的，这是http协议规范的吗？