netty-搭建简单http服务器

netty中提供了许多定义好的协议，如HTTP编解码器，我们利用它可以快速地开发一个基于netty的web服务器。

package com.throne.netty.test1.protocol;

import io.netty.bootstrap.Bootstrap;
import io.netty.bootstrap.ServerBootstrap;
import io.netty.buffer.ByteBuf;
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.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.*;
import io.netty.handler.logging.LoggingHandler;
import lombok.extern.slf4j.Slf4j;

import java.net.InetSocketAddress;
import java.nio.charset.Charset;

import static io.netty.handler.codec.http.HttpHeaderNames.CONTENT_LENGTH;

/**
 * @version v1.0
 * @Date: 2022/4/6 10:17
 * @Author: Mr.Throne
 * @Description:
 */
@Slf4j
public class TestHttp {

    public static void main(String[] args) {


        NioEventLoopGroup boss = new NioEventLoopGroup();
        NioEventLoopGroup worker = new NioEventLoopGroup();
        try {
            ServerBootstrap bootstrap = new ServerBootstrap();
            bootstrap.group(boss,worker);
            bootstrap.channel(NioServerSocketChannel.class);
            ChannelFuture future = bootstrap.childHandler(new ChannelInitializer<SocketChannel>() {
                @Override
                protected void initChannel(SocketChannel ch) throws Exception {
                    ch.pipeline().addLast(new LoggingHandler());
                    ch.pipeline().addLast(new HttpServerCodec());
                    ch.pipeline().addLast(new SimpleChannelInboundHandler<HttpRequest>() {
                        @Override
                        protected void channelRead0(ChannelHandlerContext ctx, HttpRequest msg) throws Exception {
                            log.info("{}",msg.uri());
                            log.info("{}",msg.method());
                            // 返回响应
                            DefaultFullHttpResponse response =
                                    new DefaultFullHttpResponse(msg.protocolVersion(), HttpResponseStatus.OK);

                            byte[] con = "<h1>hello netty!</h1>".getBytes();
                            response.content().writeBytes(con);
                            response.headers().setInt(CONTENT_LENGTH,con.length);
                            ctx.writeAndFlush(response);
                        }
                    });
                }
            })
            .bind(8080);
            future.channel().closeFuture().sync();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            boss.shutdownGracefully();
            worker.shutdownGracefully();
        }
    }

}

访问结果如下：