netty 5-1 用netty写一个可以用http请求的服务

代码如下
server

package http;

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

public class Server {
     
    public static void main(String[] args) throws  Exception{
     
        NioEventLoopGroup bossGroup = new NioEventLoopGroup(1);
        NioEventLoopGroup wordGroup = new NioEventLoopGroup();

        try {
     
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup, wordGroup).channel(NioServerSocketChannel.class).childHandler(new Initializer());
            ChannelFuture channelFuture = serverBootstrap.bind(6767).sync();
            channelFuture.channel().closeFuture().sync();
        } finally {
     
            bossGroup.shutdownGracefully();
            wordGroup.shutdownGracefully();
        }


    }
}

我们在Handler 需要用到的对象 此对象封装了需要初始化的条件

package http;

import io.netty.channel.Channel;
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 Initializer extends ChannelInitializer<SocketChannel> {
     

    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
     
        ChannelPipeline pipeline = ch.pipeline();//得到管道
        //加入一个http的编解码器
        pipeline.addLast("encode", new HttpServerCodec());
        pipeline.addLast("response", new Hand());

    }
}

handler对象

package 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;

public class Hand extends SimpleChannelInboundHandler<HttpObject> {
     
//HttpObject这个对象是用来封装浏览器和服务器之间的通讯信息的
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
     
        //当有客户端的请求发过来的时候。我们就读  SimpleChannelInboundHandler 这个类其实就是我们之前用的ChannelInboundHandler的一个子类。
        if (msg instanceof HttpRequest) {
     
            System.out.println("msg.getClass() = " + msg.getClass());
            System.out.println("客户端地址： " + ctx.channel().remoteAddress());
            ByteBuf byteBuf = Unpooled.copiedBuffer("我是服务器：哈哈哈", CharsetUtil.UTF_8);
            //构造一个HttpResponse
            DefaultFullHttpResponse defaultFullHttpResponse = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, byteBuf);
            defaultFullHttpResponse.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
            defaultFullHttpResponse.headers().set(HttpHeaderNames.CONTENT_LENGTH, byteBuf.readableBytes());
            ctx.writeAndFlush(defaultFullHttpResponse);

        }

    }
}

浏览器请求后的数据
我是服务器：哈哈哈
要用对应的解码：UTF-8