Netty （四）入门实例 HTTP

package com.sgg.netty.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;

/**
 * @description:
 * @date : 2020/6/19 16:17
 * @author: zwz
 */
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        System.out.println("对应的channel=" + ctx.channel() + " pipeline=" + ctx
                .pipeline() + " 通过pipeline获取channel" + ctx.pipeline().channel());

        System.out.println("当前ctx的handler=" + ctx.handler());

        HttpRequest httpRequest = (HttpRequest) msg;
        URI uri = new URI(httpRequest.uri());
        if("/favicon.ico".equals(uri.getPath())) {
            System.out.println("请求了 favicon.ico, 不做响应");
            return;
        }
        //回复信息给浏览器 [http协议]
        ByteBuf buf = Unpooled.copiedBuffer("hello, 我是服务器", CharsetUtil.UTF_8);

        //构造一个 HTTP 的响应
        FullHttpMessage response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, buf);
        response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
        response.headers().set(HttpHeaderNames.CONTENT_LENGTH, buf.readableBytes());

        ctx.writeAndFlush(response);
    }
}

package com.sgg.netty.http;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.nio.NioServerSocketChannel;

public class TestServer {
    public static void main(String[] args) throws Exception {

        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();

            serverBootstrap.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class).childHandler(new TestServerInitializer());

            ChannelFuture channelFuture = serverBootstrap.bind(7000).sync();
            
            channelFuture.channel().closeFuture().sync();

        }finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}

package com.sgg.netty.http;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpServerCodec;


public class TestServerInitializer extends ChannelInitializer<SocketChannel> {

    @Override
    protected void initChannel(SocketChannel ch) throws Exception {

        //向管道加入处理器

        //得到管道
        ChannelPipeline pipeline = ch.pipeline();

        //加入一个netty 提供的httpServerCodec codec =>[coder - decoder]
        //HttpServerCodec 说明
        //1. HttpServerCodec 是netty 提供的处理http的 编-解码器
        pipeline.addLast("MyHttpServerCodec",new HttpServerCodec());
        //2. 增加一个自定义的handler
        pipeline.addLast("MyTestHttpServerHandler", new TestHttpServerHandler());

        System.out.println("ok~~~~");

    }
}