基于netty的HTTP服务

1.服务端

public class MyServer {
    public static void main(String[] args) throws Exception {
        //创建两个线程组 bossGroup 和 workerGroup,bossGroup 处理连接请求 ,
        // bossGroup 只是处理连接请求 ,workerGroup完成真正的和客户端业务处理
        EventLoopGroup bossGroup = new NioEventLoopGroup(1);
        EventLoopGroup workerGroup = new NioEventLoopGroup();
        try {
            //创建服务器端的启动对象，配置参数
            ServerBootstrap serverBootstrap = new ServerBootstrap();
            // DIYChannelInitializer自定义channel初始化类
            serverBootstrap.group(bossGroup, workerGroup).channel(NioServerSocketChannel.class).childHandler(new DIYChannelInitializer());
            //监听
            ChannelFuture channelFuture = serverBootstrap.bind(6988).sync();
            //"关闭通道"监听
            channelFuture.channel().closeFuture().sync();
        } finally {
            bossGroup.shutdownGracefully();
            workerGroup.shutdownGracefully();
        }
    }
}

2.自定义channel初始化类

//自定义channel初始化类
public class DIYChannelInitializer extends ChannelInitializer<SocketChannel> {


    @Override
    protected void initChannel(SocketChannel ch) throws Exception {
        //得到管道
        ChannelPipeline pipeline = ch.pipeline();
        //添加Netty提供的Http编码器
        pipeline.addLast("MyHttpServerCodec", new HttpServerCodec());
        //添加自定义的处理类
        pipeline.addLast("MyHttpServerHandler", new HttpServerHandler());
        System.out.println("ok............");
    }

}

3.自定义处理类

public class HttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {
        if (msg instanceof HttpRequest) {//判断是否是http请求
            System.out.println("msg的类型:" + msg.getClass());
            System.out.println("客户端地址:" + ctx.channel().remoteAddress());
            //准备给浏览器回复的信息
            //注释:要用CharsetUtil.UTF_16,此处用utf_8在谷歌浏览器失效
            ByteBuf content = Unpooled.copiedBuffer("hello, 我是服务器", CharsetUtil.UTF_16);

            //浏览器页面响应
            /*
             * HttpVersion.HTTP_1_1:   http版本
             * HttpResponseStatus.OK:  http响应状态码
             * */
            FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);
            //http响应头
            HttpHeaders headers = response.headers();
            //设置内容类型
            headers.set(HttpHeaderNames.CONTENT_TYPE, "text/plain");
            //设置内容长度
            headers.set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());
            //开始给浏览器回复消息
            ctx.writeAndFlush(response);

        }
    }
}