客户端代码

package com.huanfeng.test;

import JAVA.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class Test11 {
    public static void main(String[] args) {
        int num=100;
        for (int i=0;i<num;i++){
            new Thread(new Runnable() {
                @Override
                public void run() {
                    String s=Test11.sendGet("http://localhost:8082");
                    System.out.println(s);
                }
            }).start();
        }

    }
    public static String sendGet(String url) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = realUrl.openConnection();
            // 设置通用的请求属性
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; windows NT 5.1;SV1)");
            // 建立实际的连接
            connection.connect();
            // 获取所有响应头字段
            Map<String, List<String>> map = connection.getHeaderFields();
            // 遍历所有的响应头字段
            for (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("发送GET请求出现异常！" + e);
            e.printStackTrace();
        }
        // 使用finally块来关闭输入流
        finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }
}

服务端代码

package com.huanfeng.test;

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 Test10 {
    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(8082).sync();
            channelFuture.channel().closeFuture().sync();
        }finally{
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}

package com.huanfeng.test;

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 kotlin.random.Random;

//HttpObject客户端和服务段相互通信的数据封装成HttpObject
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        if(msg instanceof HttpRequest){
            System.out.println("msg 类型"+msg.getClass());
            System.out.println("客户端地址"+ctx.channel().remoteAddress());
            //回复信息给浏览器
            ByteBuf content= Unpooled.copiedBuffer("hello,我是服务器", CharsetUtil.UTF_8);
            //构建一个http响应
            FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
            response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH,content.readableBytes());
            //将构建好的response进行返回
            ctx.writeAndFlush(response);
        }
    }
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        ctx.close();
    }
}

package com.huanfeng.test;

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
        //编解码器
        //http的编解码器
        pipeline.addLast("MyHttpServerCode",new HttpServerCodec());
        //添加自定义的处理器
        pipeline.addLast("MyTestHttpServerHandler",new TestHttpServerHandler());
    }
}