2021-04-25

最新推荐文章于 2024-04-10 17:33:36 发布

EatJavaDne

最新推荐文章于 2024-04-10 17:33:36 发布

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分类专栏：数据结构与算法

本文链接：https://blog.youkuaiyun.com/EatJavaDne/article/details/116139464

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Server
BusiHandler

package cn.enjoyedu.nettyhttp.server;

import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

/**
 * @author Mark老师   享学课堂 https://enjoy.ke.qq.com
 * 往期课程和VIP课程咨询 依娜老师  QQ：2133576719
 * 类说明：
 */
public class BusiHandler extends ChannelInboundHandlerAdapter {

    /**
     * 发送的返回值
     * @param ctx     返回
     * @param context 消息
     * @param status 状态
     */
    private void send(ChannelHandlerContext ctx, String context,
                      HttpResponseStatus status) {
        FullHttpResponse response = new DefaultFullHttpResponse(
                HttpVersion.HTTP_1_1,status,
                Unpooled.copiedBuffer(context,CharsetUtil.UTF_8)
        );
        response.headers().set(HttpHeaderNames.CONTENT_TYPE,"text/plain;charset=UTF-8");
        ctx.writeAndFlush(response).addListener(ChannelFutureListener.CLOSE);
    }

    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        String result="";
        FullHttpRequest httpRequest = (FullHttpRequest)msg;
        System.out.println(httpRequest.headers());
        try{
            //获取路径
            String path=httpRequest.uri();
            //获取body
            String body = httpRequest.content().toString(CharsetUtil.UTF_8);
            //获取请求方法
            HttpMethod method=httpRequest.method();
            System.out.println("接收到:"+method+" 请求");
            //如果不是这个路径，就直接返回错误
            if(!"/test".equalsIgnoreCase(path)){
                result="非法请求!"+path;
                send(ctx,result,HttpResponseStatus.BAD_REQUEST);
                return;
            }

            //如果是GET请求
            if(HttpMethod.GET.equals(method)){
                //接受到的消息，做业务逻辑处理...
                System.out.println("body:"+body);
                result="GET请求,应答:"+RespConstant.getNews();
                send(ctx,result,HttpResponseStatus.OK);
                return;
            }
            //如果是其他类型请求，如post
            if(HttpMethod.POST.equals(method)){
                //接受到的消息，做业务逻辑处理...
                //....
                return;
            }

        }catch(Exception e){
            System.out.println("处理请求失败!");
            e.printStackTrace();
        }finally{
            //释放请求
            httpRequest.release();
        }
    }

    /*
     * 建立连接时，返回消息
     */
    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println("连接的客户端地址:" + ctx.channel().remoteAddress());
    }
}

HttpServer

package cn.enjoyedu.nettyhttp.server;

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;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.SelfSignedCertificate;

/**
 * @author Mark老师   享学课堂 https://enjoy.ke.qq.com
 * 往期课程和VIP课程咨询 依娜老师  QQ：2133576719
 * 类说明：
 */
public class HttpServer {
    public static final int port = 6789; //设置服务端端口
    private static EventLoopGroup group = new NioEventLoopGroup();   // 通过nio方式来接收连接和处理连接
    private static ServerBootstrap b = new ServerBootstrap();
    private static final boolean SSL = false;/*是否开启SSL模式*/

    /**
     * Netty创建全部都是实现自AbstractBootstrap。
     * 客户端的是Bootstrap，服务端的则是ServerBootstrap。
     **/
    public static void main(String[] args) throws Exception {
        final SslContext sslCtx;
        if(SSL){
            SelfSignedCertificate ssc = new SelfSignedCertificate();
            sslCtx = SslContextBuilder.forServer(ssc.certificate(),
                    ssc.privateKey()).build();

        }else{
            sslCtx = null;
        }
        try {
            b.group(group);
            b.channel(NioServerSocketChannel.class);
            b.childHandler(new ServerHandlerInit(sslCtx)); //设置过滤器
            // 服务器绑定端口监听
            ChannelFuture f = b.bind(port).sync();
            System.out.println("服务端启动成功,端口是:"+port);
            // 监听服务器关闭监听
            f.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully(); //关闭EventLoopGroup，释放掉所有资源包括创建的线程
        }
    }
}

RespConstant

package cn.enjoyedu.nettyhttp.server;

import java.util.Random;

/**
 * @author Mark老师   享学课堂 https://enjoy.ke.qq.com
 * 往期课程和VIP课程咨询 依娜老师  QQ：2133576719
 * 类说明：
 */
public class RespConstant {
    private static final String[] NEWS = {
            "她那时候还太年轻，不知道所有命运赠送的礼物，早已在暗中标好了价格。——斯蒂芬·茨威格《断头皇后》",
            "这是一个最好的时代，也是一个最坏的时代；这是一个智慧的年代，这是一个愚蠢的年代；\n" +
                    "这是一个信任的时期，这是一个怀疑的时期；这是一个光明的季节，这是一个黑暗的季节；\n" +
                    "这是希望之春，这是失望之冬；人们面前应有尽有，人们面前一无所有；\n" +
                    "人们正踏上天堂之路，人们正走向地狱之门。 —— 狄更斯《双城记》",
            };

    private static final Random R = new Random();

    public static String getNews(){
        return NEWS[R.nextInt(NEWS.length)];
    }

}

ServerHandleInit

package cn.enjoyedu.nettyhttp.server;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpContentCompressor;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.ssl.SslContext;

/**
 * @author Mark老师   享学课堂 https://enjoy.ke.qq.com
 * 往期课程和VIP课程咨询 依娜老师  QQ：2133576719
 * 类说明：
 */
public class ServerHandlerInit extends ChannelInitializer<SocketChannel> {

    private final SslContext sslCtx;

    public ServerHandlerInit(SslContext sslCtx) {
        this.sslCtx = sslCtx;
    }

    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        ChannelPipeline ph = ch.pipeline();
        if(sslCtx!=null){
            ph.addLast(sslCtx.newHandler(ch.alloc()));
        }
        /*把应答报文 编码*/
        ph.addLast("encoder",new HttpResponseEncoder());
        /*把请求报文 解码*/
        ph.addLast("decoder",new HttpRequestDecoder());


        /*聚合http为一个完整的报文*/
        ph.addLast("aggregator",
                new HttpObjectAggregator(10*1024*1024));
        /*把应答报文 压缩,非必要*/
        ph.addLast("compressor",new HttpContentCompressor());
        ph.addLast(new BusiHandler());


    }
}

Client
HttpClient

package cn.enjoyedu.nettyhttp.client;

import cn.enjoyedu.nettyhttp.server.HttpServer;
import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.http.*;

import java.net.URI;

/**
 * @author Mark老师   享学课堂 https://enjoy.ke.qq.com
 * 往期课程和VIP课程咨询 依娜老师  QQ：2133576719
 * 类说明：
 */
public class HttpClient {
    public static final String HOST  = "127.0.0.1";
    private static final boolean SSL = false;
    public void connect(String host, int port) throws Exception {
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(workerGroup);
            b.channel(NioSocketChannel.class);
            b.option(ChannelOption.SO_KEEPALIVE, true);
            b.handler(new ChannelInitializer<SocketChannel>() {
                @Override
                public void initChannel(SocketChannel ch) throws Exception {
                    ch.pipeline().addLast(new HttpClientCodec());
                    /*聚合http为一个完整的报文*/
                    ch.pipeline().addLast("aggregator",
                            new HttpObjectAggregator(10*1024*1024));
                    /*解压缩*/
                    ch.pipeline().addLast("decompressor",
                            new HttpContentDecompressor());
                    ch.pipeline().addLast(new HttpClientInboundHandler());
                }
            });

            // Start the client.
            ChannelFuture f = b.connect(host, port).sync();
            f.channel().closeFuture().sync();
        } finally {
            workerGroup.shutdownGracefully();
        }
    }

    public static void main(String[] args) throws Exception {
        HttpClient client = new HttpClient();
        client.connect("127.0.0.1", HttpServer.port);
    }
}

HttpClientInboundHandler

package cn.enjoyedu.nettyhttp.client;

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

import java.net.URI;

/**
 * @author Mark老师   享学课堂 https://enjoy.ke.qq.com
 * 往期课程和VIP课程咨询 依娜老师  QQ：2133576719
 * 类说明：
 */
public class HttpClientInboundHandler extends ChannelInboundHandlerAdapter {

    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        FullHttpResponse httpResponse = (FullHttpResponse)msg;
        System.out.println(httpResponse.status());
        System.out.println(httpResponse.headers());
        ByteBuf buf = httpResponse.content();
        System.out.println(buf.toString(CharsetUtil.UTF_8));
        httpResponse.release();
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        URI uri = new URI("/test");
        String msg = "Hello";
        DefaultFullHttpRequest request =
                new DefaultFullHttpRequest(HttpVersion.HTTP_1_1,
                        HttpMethod.GET,
                        uri.toASCIIString(),
                        Unpooled.wrappedBuffer(msg.getBytes("UTF-8")));

        // 构建http请求
        request.headers().set(HttpHeaderNames.HOST, HttpClient.HOST);
        request.headers().set(HttpHeaderNames.CONNECTION,
                HttpHeaderValues.KEEP_ALIVE);
        request.headers().set(HttpHeaderNames.CONTENT_LENGTH,
                request.content().readableBytes());
        // 发送http请求
        ctx.writeAndFlush(request);
    }
}