快速入门实例-HTTP服务

实例要求

1.使用IDEA 创建Netty项目

2.Netty 服务器在 9999端口监听，浏览器发出请求 “http://localhost:9999/ ”

3.服务器可以回复消息给客户端 “你好，我是服务器 ”

代码示例

package com.wxit.http;

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;

/**
 * @Author wj
 **/
public class TestServer {
    public static void main(String[] args) {

        EventLoopGroup bossGroup = new NioEventLoopGroup();
        EventLoopGroup workerGroup = new NioEventLoopGroup();

        try {
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            serverBootstrap.group(bossGroup,workerGroup)
                    .channel(NioServerSocketChannel.class)
                    .childHandler(new TestServerInitializer());
            ChannelFuture channelFuture = serverBootstrap.bind(9999).sync();
            channelFuture.channel().closeFuture().sync();
        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}

package com.wxit.http;

import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.socket.SocketChannel;
import io.netty.handler.codec.http.HttpServerCodec;


/**
 * @Author wj
 **/
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httpServerCode
        //HttpServerCodec 是netty提供的处理http的编-解码器
        pipeline.addLast("MyHttpServerCodec",new HttpServerCodec());
        //增加一个自定义的handler
        pipeline.addLast("MyTestHttpServerHandler",new TestHttpServerHandler());
    }
}

package com.wxit.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;

/**
 * @Author wj
 * HttpObject 客户端和服务器端相互通讯的数据被封装成HttpObject
 **/
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {

    //channelRead0 读取客户端数据
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        //判断msg 是不是http request请求
        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(http协议)
            ByteBuf content = Unpooled.copiedBuffer("你好，我是服务器", CharsetUtil.UTF_8);

            //构造一个http的响应
            DefaultFullHttpResponse 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response返回
            ctx.writeAndFlush(response);
        }
    }
}

运行结果