netty http服务-爱代码爱编程

HttpServer:

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 HttpServer {
    public static void main(String[] args) throws InterruptedException {
        EventLoopGroup boosGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try{
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(boosGroup, workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new HttpServerInitializer());

            ChannelFuture channelFuture = serverBootstrap.bind(9527).sync();
            channelFuture.channel().closeFuture().sync();
        }finally {
            boosGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}

HttpServerHandler:

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;

/**
 * SimpleChannelInboundHandler 是 ChannelInboundHandlerAdapter 子类
 * HttpObject 客户端和服务器端相互通讯的数据被封装成 HttpObject类型
 */
public class HttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {

    // 读取客户端数据
    @Override
    protected void channelRead0(ChannelHandlerContext channelHandlerContext, HttpObject httpObject) throws Exception {
        // 判断 msg 是不是 HttpRequest请求
        if (httpObject instanceof HttpRequest) {
            System.out.println("pipeline hashcode=" + channelHandlerContext.hashCode() + " HttpServerHandler hashcode=" + this.hashCode());

            System.out.println("msg 类型=" + httpObject.getClass());
            System.out.println("客户端地址" + channelHandlerContext.channel().remoteAddress());


            HttpRequest httpRequest = (HttpRequest) httpObject;
            // 获取uri
            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
            ByteBuf content = Unpooled.copiedBuffer("hello, 我是9527", CharsetUtil.UTF_8);

            // 构造一个http的响应，即 HttpResponse
            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 返回
            channelHandlerContext.writeAndFlush(response);
        }
    }
}

HttpServerInitializer:

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 HttpServerInitializer extends ChannelInitializer<SocketChannel> {
    @Override
    protected void initChannel(SocketChannel socketChannel) throws Exception {

        // 向管道加入处理器
        ChannelPipeline pipeline = socketChannel.pipeline();

        // 加入一个 netty 提供的httpServerCodec(编码解码器)
        pipeline.addLast("MyHttpServerCodec", new HttpServerCodec());

        // 增加一个自定义的handler
        pipeline.addLast("MyHttpServerHandler", new HttpServerHandler());
    }
}